+publisher:"Florida State University" +contributor:("Jeffrey P. Chanton")

Florida State University

1. Mauney, Michael Tyler. Biogenic Ethane Production in Hypersaline Environments.

Degree: MS, Earth, Ocean, and Atmospheric Science, 2015, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9395 ;

► Trace gas analysis in Earth systems plays an important role in planetary research. Bernard (1976) and Whiticar (1999) proposed that biologically produced methane and thermogenically… (more)

▼ Trace gas analysis in Earth systems plays an important role in planetary research. Bernard (1976) and Whiticar (1999) proposed that biologically produced methane and thermogenically or geologically produced methane could be differentiated in marine environments through isotopic analysis coupled with methane to higher n-alkane gas concentration ratios. This differentiation is important to the study of exobiology; the ability to determine a biological source of atmospheric gas production through isotopic and/or concentration analysis could prove critical to the search for a "second genesis" within our solar system, greatly increasing the probability of life throughout the universe. It is hypothesized that the earliest forms of life on Earth were methanogenic archaea developing in extreme anaerobic conditions. These conditions include high temperature >90°C hydrothermal vents as well as hypersaline environments where archaea have been found to exist in present day (Rasmussen 2000, Huber et al., 1989, Kelley et al., 2005 ). Analogous hypersaline paleoenvironments have been found to exist on Mars (Osterloo, M.M. et al., 2008). Tazaz (2012) proposed an extension to the biogenic isotopic boundaries of methane from hypersaline environments investigated in Baja, Mexico. Here we reconfirm Tazaz's results from Baja while showing a similar isotopic composition of methane in hypersaline environments in Atacama, Chile. Tazaz (2012) also proposed further research into low methane to higher n-alkane gas ratios found in field samples from Baja, Mexico. We show here through lab incubation experiments of sediment collected in Baja, Mexico and Atacama, Chile that these low ratios are primarily due to the biogenic production of ethane in hypersaline environments. Experiments were done with various substrate amendments to investigate the greatest yield of ethane and the effects of inhibiting sulfate reducing bacteria. Given the significance of such findings, it is essential to examine the extremophiles that exist in hypersaline environments to gain a better understanding of the biomarkers in trace gas analysis. p>A Thesis submitted to the Department of Earth, Ocean and Atmospheric Science in partial fulfillment of the Master of Science. p>Spring Semester, 2015. p>January 30, 2015. p>Astrobiology, Exobiology, Extremophiles, Hypersaline p>Jeffery Chanton, Professor Directing Thesis; Olivia Mason, Committee Member; Angela Knapp, Committee Member.p> Advisors/Committee Members: Jeffrey P. Chanton (professor directing thesis), Olivia Underwood Mason (committee member), Angela Noel Knapp (committee member).

Subjects/Keywords: Biogeochemistry

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APA (6^th Edition):

Mauney, M. T. (2015). Biogenic Ethane Production in Hypersaline Environments. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9395 ;

Chicago Manual of Style (16^th Edition):

Mauney, Michael Tyler. “Biogenic Ethane Production in Hypersaline Environments.” 2015. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-9395 ;.

MLA Handbook (7^th Edition):

Mauney, Michael Tyler. “Biogenic Ethane Production in Hypersaline Environments.” 2015. Web. 10 Apr 2021.

Vancouver:

Mauney MT. Biogenic Ethane Production in Hypersaline Environments. [Internet] [Masters thesis]. Florida State University; 2015. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9395 ;.

Council of Science Editors:

Mauney MT. Biogenic Ethane Production in Hypersaline Environments. [Masters Thesis]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9395 ;

Florida State University

2. Mickle, Alejandra. Trophic Ecology and Bioaccumulation of Mercury in the Three Hagfish (Myxinidae) Species from the Gulf of Mexico.

Degree: MS, Earth, Ocean, and Atmospheric Science, 2016, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_2016SP_Mickle_fsu_0071N_13275 ;

► Hagfishes (Myxinidae) are common in deep waters of the Gulf of Mexico (GOM). Two of the species found in the GOM are endemic to the… (more)

▼ Hagfishes (Myxinidae) are common in deep waters of the Gulf of Mexico (GOM). Two of the species found in the GOM are endemic to the area and potentially provide key ecosystem services (e.g. generate substrate turnover and recycling of organic matter by consuming carrion falls) to the deep environments of the Gulf. Yet, very little is known about hagfish life histories and ecology. I investigated inter and intraspecific variations in trophic structure of Eptatretus springeri, Eptatretus minor, Myxine mcmillanae, including variations along relevant environmental gradients. At the time of this study, the Gulf of Mexico had recently experienced an environmental disaster with the Deep Water Horizon (DWH) oil spill. As a result, I also investigated the potential effects of the DWH oil spill on hagfish trophic structure, and the potential for higher bioaccumulation of mercury (Hg) in their muscle tissue. Feeding ecology and trophic structure were investigated using nitrogen (δ15N), carbon (δ13C) and sulfur (δ34S) stable isotopes and variability in the lipid content (Δδ13C) of each species was used as an indicator of periods of feeding and fasting. I was able to differentiate the isotopic niche of each of the species and determine the different feeding ecologies of E. springeri and M. mcmillanae. The isotopic niche of E. minor overlaps with that of E. springeri and M. mcmillanae. The most depleted mean δ15N values were observed in E. springeri (12.8‰), followed by E. minor (13.9 ‰) and M. mcmillanae (14.9‰). Eptatretus springeri had the highest (Δδ13C), lowest trophic level (δ15N) and exhibited the most isotopic variation with depth. This could suggest this species is an active predator that feeds regularly, and potentially relies on scavenging only to supplement its diet. Eptatretus minor had slightly higher Δδ13C, intermediate but depleted δ15N, and higher δ15N isotopic diversity. These characteristics suggest a more opportunistic foraging behavior for this species, potentially feeding on prey items from several trophic levels. Myxine mcmillanae had the highest δ15N but lowest Δδ13C, and no variation in δ15N with depth. These trends indicate this species could be experiencing irregular feeding with periods of fasting, potentially due to a mostly scavenging behavior and occasionally feeding on larger but infrequently available carrion falls of large animals. Spatial analysis showed all hagfish species displayed enriched δ15N and δ13C, and depleted δ34S values on the continental slope off Louisiana than along the North Florida Slope and in DeSoto Canyon. These shifts in isotopic signatures could be attributed to influx from riverine sources from the Mississippi River. Temporal variations were also correlated to the seasonality of nutrient discharge from the river. Isotopic shifts seemed to… Advisors/Committee Members: Jeffrey P. Chanton (professor co-directing thesis), William M. Landing (committee member).

Subjects/Keywords: Marine biology; Ecology

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APA (6^th Edition):

Mickle, A. (2016). Trophic Ecology and Bioaccumulation of Mercury in the Three Hagfish (Myxinidae) Species from the Gulf of Mexico. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2016SP_Mickle_fsu_0071N_13275 ;

Chicago Manual of Style (16^th Edition):

Mickle, Alejandra. “Trophic Ecology and Bioaccumulation of Mercury in the Three Hagfish (Myxinidae) Species from the Gulf of Mexico.” 2016. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_2016SP_Mickle_fsu_0071N_13275 ;.

MLA Handbook (7^th Edition):

Mickle, Alejandra. “Trophic Ecology and Bioaccumulation of Mercury in the Three Hagfish (Myxinidae) Species from the Gulf of Mexico.” 2016. Web. 10 Apr 2021.

Vancouver:

Mickle A. Trophic Ecology and Bioaccumulation of Mercury in the Three Hagfish (Myxinidae) Species from the Gulf of Mexico. [Internet] [Masters thesis]. Florida State University; 2016. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SP_Mickle_fsu_0071N_13275 ;.

Council of Science Editors:

Mickle A. Trophic Ecology and Bioaccumulation of Mercury in the Three Hagfish (Myxinidae) Species from the Gulf of Mexico. [Masters Thesis]. Florida State University; 2016. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SP_Mickle_fsu_0071N_13275 ;

Florida State University

3. Luzius, Casey R. Delineating Drivers of Dissolved Organic Matter Composition in a Major Freshwater Spring.

Degree: MS, Earth, Ocean, and Atmospheric Science, 2018, Florida State University

URL: http://purl.flvc.org/fsu/fd/2018_Sp_Luzius_fsu_0071N_14441 ;

► Globally, karst ecosystems are experiencing anthropogenic impacts due to their high hydrologic connectivity, leading to issues including increasing color (browning) as noted in recent decades… (more)

▼ Globally, karst ecosystems are experiencing anthropogenic impacts due to their high hydrologic connectivity, leading to issues including increasing color (browning) as noted in recent decades at the largest freshwater spring on Earth (Wakulla Springs, Florida, USA). Wakulla Springs is located within a karst landscape, characterized by numerous sinkholes connecting surface and groundwaters. Surface waters and associated dissolved organic matter (DOM) from both natural sources (e.g. Apalachicola National Forest) and anthropogenic sources (e.g. municipal wastewater facility, sprayfield farm and diffuse inputs from the city of Tallahassee) are transported through these features and discharged at Wakulla Springs’ vent. In this study we assess dissolved organic matter (DOM) composition via absorbance and fluorescence spectroscopy and Fourier Transform ion cyclotron mass spectrometry (FT-ICR MS) to evaluate seasonal changes in DOM composition and dissolved organic carbon (DOC) concentration. Samples were collected between August 2015 and August 2016, bi-weekly, at three wells and two fluvial sites throughout Wakulla Springs State Park. These wells represent conduits feeding from different locations in the springshed, encompassing the major inputs and sources of DOM to the Spring vent and downstream Wakulla River. Sample sites separated into distinct groups based on DOC concentration and optical and FT-ICR MS parameters indicative of autochthonous (clear groundwater) versus allochthonous (terrestrial) DOM. Seasonal trends in DOM composition at Wakulla Springs vent are apparent and predominantly driven by high precipitation events and associated inputs of DOM from the Apalachicola National Forest with increased color, DOC, and terrestrially sourced molecular signatures. Principle component analysis highlights the ability of optical parameters to show the dominance of sample sites draining from the southwest (i.e. Apalachicola National Forest) as responsible for the color rich water at the vent, whereas water draining from the north was comparatively clear. Multivariate analyses demonstrates how FT-ICR MS can clearly distinguish the molecular signatures of clear groundwaters and afforested blackwater inputs, and emphasize the dominance of conduits draining from afforested sites as controlling the DOM signature and associated color at the vent. Despite the hydrologic complexity of the aquifer, FT-ICR MS allowed for clear discrimination between the different DOM sources and so these methodologies may be applied to aquifers around the world to trace inputs and evolved signatures. Increasing colored rich waters at the vent suggests that either input from conduits draining from the southwest have increased, or the relative dilution with clear groundwater has decreased in the conduit system prior to discharge from the vent. Sea-level rise impacts in the region have been suggested to result in more blackwaters delivered to the vent, and ongoing extraction of clear groundwater reduces the dilution capacity on color rich waters. Thus,… Advisors/Committee Members: Robert G. M. Spencer (professor directing thesis), Jeffrey P. Chanton (committee member), Mariana Fuentes (committee member).

Subjects/Keywords: Biogeochemistry; Aquaculture; Environmental sciences

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APA (6^th Edition):

Luzius, C. R. (2018). Delineating Drivers of Dissolved Organic Matter Composition in a Major Freshwater Spring. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/2018_Sp_Luzius_fsu_0071N_14441 ;

Chicago Manual of Style (16^th Edition):

Luzius, Casey R. “Delineating Drivers of Dissolved Organic Matter Composition in a Major Freshwater Spring.” 2018. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/2018_Sp_Luzius_fsu_0071N_14441 ;.

MLA Handbook (7^th Edition):

Luzius, Casey R. “Delineating Drivers of Dissolved Organic Matter Composition in a Major Freshwater Spring.” 2018. Web. 10 Apr 2021.

Vancouver:

Luzius CR. Delineating Drivers of Dissolved Organic Matter Composition in a Major Freshwater Spring. [Internet] [Masters thesis]. Florida State University; 2018. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/2018_Sp_Luzius_fsu_0071N_14441 ;.

Council of Science Editors:

Luzius CR. Delineating Drivers of Dissolved Organic Matter Composition in a Major Freshwater Spring. [Masters Thesis]. Florida State University; 2018. Available from: http://purl.flvc.org/fsu/fd/2018_Sp_Luzius_fsu_0071N_14441 ;

Florida State University

4. Montero, Natalie. Influences of the Local Climate on Loggerhead Sea Turtle (Caretta caretta) Hatchling Output.

Degree: MS, Earth, Ocean, and Atmospheric Science, 2018, Florida State University

URL: http://purl.flvc.org/fsu/fd/2018_Sp_Montero_fsu_0071N_14548 ;

► LLocal climate influences sea turtle hatching and emergence success with climatic extremes affecting embryonic development and hatchling emergence. Thus, it is crucial to understand how… (more)

▼ LLocal climate influences sea turtle hatching and emergence success with climatic extremes affecting embryonic development and hatchling emergence. Thus, it is crucial to understand how different climatic variables affect hatchling output presently and explore how potential climate change may impact future hatchling output and population stability. This thesis examines the influences of six climatic variables (air and sea surface temperature, precipitation, humidity, wind speed, and solar radiation) on the hatchling output of the loggerhead sea turtle (Caretta caretta) for two distinct nesting populations: Southwest Atlantic Loggerhead Regional Management Unit, which nests in Brazil, and the Northern Gulf of Mexico Loggerhead Recovery Unit, which nest in North Florida, USA and is part of the Northwest Atlantic Loggerhead Recovery Management Unit. Additionally, this thesis explores how potential climate change may impact future hatchling output. The main drivers of hatchling output varied across populations, nesting regions, and beaches. In Brazil, air temperature and precipitation were found to be the main climatic drivers of hatchling output, whereas in North Florida as well as air temperature and precipitation, humidity was a significant climatic driver of hatchling output. Climate projections show air temperatures warming at all sites throughout the 21st century, while projections for precipitation and humidity varied regionally. Our projections indicate that by 2100, tropical nesting beaches (Bahia, Brazil) will experience declines in hatching success, while temperate regions (Espirito Santo and Rio de Janeiro, Brazil and North Florida) will experience increases in hatching success. This thesis highlights the need to assess the climatic drivers of hatchling output at a regional scale, especially in temperate areas, to better understand how projected climate change may impact populations and better inform management. p>A Thesis submitted to the Department of Earth, Ocean, and Atmospheric Science in partial fulfillment of the requirements for the degree of Master of Science. p>Spring Semester 2018. p>April 12, 2018. p>Brazil, Florida, marine turtle, moisture, reproductive output, temperate p>Mariana M. P. B. Fuentes, Professor Directing Thesis; Markus Huettel, Committee Member; Jeff Chanton, Committee Member.p> Advisors/Committee Members: Mariana Fuentes (professor directing thesis), Markus Huettel (committee member), Jeffrey P. Chanton (committee member).

Subjects/Keywords: Marine biology

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APA (6^th Edition):

Montero, N. (2018). Influences of the Local Climate on Loggerhead Sea Turtle (Caretta caretta) Hatchling Output. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/2018_Sp_Montero_fsu_0071N_14548 ;

Chicago Manual of Style (16^th Edition):

Montero, Natalie. “Influences of the Local Climate on Loggerhead Sea Turtle (Caretta caretta) Hatchling Output.” 2018. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/2018_Sp_Montero_fsu_0071N_14548 ;.

MLA Handbook (7^th Edition):

Montero, Natalie. “Influences of the Local Climate on Loggerhead Sea Turtle (Caretta caretta) Hatchling Output.” 2018. Web. 10 Apr 2021.

Vancouver:

Montero N. Influences of the Local Climate on Loggerhead Sea Turtle (Caretta caretta) Hatchling Output. [Internet] [Masters thesis]. Florida State University; 2018. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/2018_Sp_Montero_fsu_0071N_14548 ;.

Council of Science Editors:

Montero N. Influences of the Local Climate on Loggerhead Sea Turtle (Caretta caretta) Hatchling Output. [Masters Thesis]. Florida State University; 2018. Available from: http://purl.flvc.org/fsu/fd/2018_Sp_Montero_fsu_0071N_14548 ;

Florida State University

5. Higgs, Bently Hillory. The Development of the Gas Push-Pull Test for Landfill Cover Soil Applications.

Degree: MS, Civil and Environmental Engineering, 2014, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9187 ;

► The purpose of this thesis was to develop the Gas Push-Pull Test (GPPT) for landfill cover soil applications to measure H2S oxidation. This thesis begins… (more)

▼ The purpose of this thesis was to develop the Gas Push-Pull Test (GPPT) for landfill cover soil applications to measure H2S oxidation. This thesis begins with an overview of solid waste management in the USA, and describes the alternatives for discarding and handling of solid waste. Also, discussions about the components that makeup a landfill to help resist the exposure of contaminants from the solid waste to the environment is elaborated upon. In addition, the ways in which landfill gas is generated by placing solid waste into landfills along with mitigation techniques to help attenuate H2S is discussed. Then the most suitable test to quantify in-situ rates of chemical or microbial reactions in the vadose zone or unsaturated zone which is the GPPT, is introduced. As a part of the development of the Gas Push-Pull Test (GPPT), chapter three presents a new methodology that allows for sound implementation of the GPPT in diverse subsurface environments such as a landfill to better understand the transport of gaseous components during the GPPT. For this to be accomplished, many GPPTs were run in fine sand and clayey fine sand with non-reactive gases methane (CH4) and sulfur hexaflouride (SF6) with molecular weights of 16.04 g/mol and 146.06 g/mol. With the data from the GPPTs, an equation or function called the correction factor was formulated to correct for the difference in molecular weights. The correction factor was applied to the GPPTs data and was successful in correcting CH4 and SF6 the non-reactive gases to have a molecular weight equal to the reactive gas Hydrogen Sulfide (H2S) with a molecular weight of 34 g/mol. Now one does not have to search for a tracer with equal transport capabilities like the reactive gas, one need only apply the correction factor. Now you are able to account for how much reactive gas was lost because of transport through the cover soils and by reactions within the cover soils. Once the correction factor was applied, the reacted portion can be used to calculate oxidation or reaction rates of landfill cover soils which is shown in chapter four. Also, to optimize H2S reduction in various soil types, it was important to be able to accurately quantify the reaction rate coefficient, k. Therefore, chapter four focuses on the use of lab and field techniques to examine reaction rates of H2S with fine sand, silty fine sand, clayey fine sand, compost and landfill cover soil. First, a series of laboratory flask experiments were conducted to assess the reaction rates of various soil types with no moisture, and then with varying water content from 10% to 60%. Next, the Gas Push-Pull Test (GPPT) was conducted in the field in different soil types to assess reaction rates. The laboratory results showed that the landfill cover soil had the highest reaction rate of 41.87 hr-1 when the soil had no moisture. Whereas compost had the highest reaction rate from 5.84 hr-1 to… Advisors/Committee Members: Tarek Abichou (professor directing thesis), Jeffrey P. Chanton (committee member), Gang Chen (committee member).

Subjects/Keywords: Civil engineering

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APA (6^th Edition):

Higgs, B. H. (2014). The Development of the Gas Push-Pull Test for Landfill Cover Soil Applications. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9187 ;

Chicago Manual of Style (16^th Edition):

Higgs, Bently Hillory. “The Development of the Gas Push-Pull Test for Landfill Cover Soil Applications.” 2014. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-9187 ;.

MLA Handbook (7^th Edition):

Higgs, Bently Hillory. “The Development of the Gas Push-Pull Test for Landfill Cover Soil Applications.” 2014. Web. 10 Apr 2021.

Vancouver:

Higgs BH. The Development of the Gas Push-Pull Test for Landfill Cover Soil Applications. [Internet] [Masters thesis]. Florida State University; 2014. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9187 ;.

Council of Science Editors:

Higgs BH. The Development of the Gas Push-Pull Test for Landfill Cover Soil Applications. [Masters Thesis]. Florida State University; 2014. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9187 ;

Florida State University

6. Rogers, Kelsey. A Spatial and Temporal Investigation of Carbon Isotopes in Particulate Organic Carbon in the Gulf of Mexico.

Degree: MS, Earth, Ocean, and Atmospheric Science, 2014, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9239 ;

► The Deepwater Horizon (DwH) blowout released 5.0x1011g C from gaseous hydrocarbon into the water column and up to 6.0x1011g C from oil (Joye et al.,… (more)

▼ The Deepwater Horizon (DwH) blowout released 5.0x1011g C from gaseous hydrocarbon into the water column and up to 6.0x1011g C from oil (Joye et al., 2011). Oil was visible on the surface, but <0.01% of the gaseous hydrocarbon escaped the water column (Kessler et al., 2011; Yvon-Lewis et al., 2011). Metabolically efficient methanotrophs consumed the gases, converting them into either CO2 or biomass. For this study, we analyzed carbon isotopes, δ13C and Δ14C, in suspended particulate organic carbon (POC) to detect the fate of some of the hydrocarbons. Suspended particulate organic carbon has a residence time of 5-10 years in the water column (Druffel and Williams, 1990) and is composed of floating biomass including mucus, plankton, bacteria, fecal pellets and other organic particles greater than 1μm. POC too large to float sinks and is then classified as sinking POC. Marine snow is an example of sinking POC. Suspended and sinking POC can be composed of the same types of biomass, however they can be formed from different carbon sources and different areas of the water column. The primary focus of this study is on suspended POC. We hypothesized that the DwH event caused depleted δ13C and Δ14C signatures in POC that we would see fade over time and with distance away from the blowout, horizontally and vertically in the water column. Our second hypothesis was that carbon isotope signatures should also differ between natural hydrocarbon seep sites and non-seep sites. We also wanted to determine the percent carbon in each sample from methane or oil derived carbon and the total amount of POC in our sampling area in the Gulf of Mexico composed of carbon from hydrocarbons. Our data set was compared to sediment carbon isotope data from the Gulf of Mexico to rule out one possible alternative hypothesis that could cause depleted carbon isotope signatures, sediment resuspension. To complete these objectives, POC samples were collected from Desoto Canyon and other seep and non-seep sites across the Northern Gulf of Mexico in 2010, 2012 and 2013. Seawater was filtered, collecting the POC on glass microfiber filters, which were then acid fumed, dried and analyzed for δ13C and Δ14C. The hydrocarbon plume from the DwH blowout was detected in 2010 POC samples. Over 2010, 2012 and 2013 sampling years, δ13C signatures ranged from −17.8 / to −35.2 /. Radiocarbon signatures ranged from 71.2 / to −755.5 /. Percent carbon from modern, methane and oil derived carbon for 29 deep POC samples was estimated to contain 58% ±; 19% modern, 33%±;19% methane and 9%±;5% oil. We found no yearly variation between signatures on POC samples collected in the deeper waters, which suggests that the Gulf of Mexico always has depleted carbon isotope signatures at deeper depths and the effect of the oil spill, although clearly detectable in 2010, was relatively minor on suspended POC. GC600, a well known and active… Advisors/Committee Members: Jeffrey P. Chanton (professor directing thesis), Olivia Underwood Mason (committee member), Yang Wang (committee member).

Subjects/Keywords: Environmental sciences; Biogeochemistry

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APA (6^th Edition):

Rogers, K. (2014). A Spatial and Temporal Investigation of Carbon Isotopes in Particulate Organic Carbon in the Gulf of Mexico. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9239 ;

Chicago Manual of Style (16^th Edition):

Rogers, Kelsey. “A Spatial and Temporal Investigation of Carbon Isotopes in Particulate Organic Carbon in the Gulf of Mexico.” 2014. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-9239 ;.

MLA Handbook (7^th Edition):

Rogers, Kelsey. “A Spatial and Temporal Investigation of Carbon Isotopes in Particulate Organic Carbon in the Gulf of Mexico.” 2014. Web. 10 Apr 2021.

Vancouver:

Rogers K. A Spatial and Temporal Investigation of Carbon Isotopes in Particulate Organic Carbon in the Gulf of Mexico. [Internet] [Masters thesis]. Florida State University; 2014. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9239 ;.

Council of Science Editors:

Rogers K. A Spatial and Temporal Investigation of Carbon Isotopes in Particulate Organic Carbon in the Gulf of Mexico. [Masters Thesis]. Florida State University; 2014. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9239 ;

Florida State University

7. Forkink, Annet. Ecosystem Services Assessments as a Planning Tool in Florida.

Degree: PhD, Urban and Regional Planning, 2015, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9600 ;

► Many states within the U.S., including Florida, have seen steady population growth since the 1950s. While population growth can lead to economic growth, excessive growth… (more)

▼ Many states within the U.S., including Florida, have seen steady population growth since the 1950s. While population growth can lead to economic growth, excessive growth of urban areas can lead to negative externalities such as road congestion, air and water pollution, decreased access to open space, habitat loss, and habitat fragmentation. This realization has led to increasing political and stakeholder pressure to more comprehensively assess impacts of land-use planning projects on human-natural systems. The Ecosystem Services Assessment (ESA) approach is a relatively new approach which is described in the peer-reviewed literature as comprehensive and holistic. This dissertation study researched the potential of an ESA approach as a planning tool in Florida by addressing the following research questions: 1) What are the guidelines for best practices in ESAs from the literature? 2) How are ESAs currently used in land-use planning projects in Florida? 3) How is the traditional approach used in land-use planning projects in Florida? 4) What are key differences between the ESA approaches used in the case studies and the guidelines for best practices in ESAs? 5) What are key differences between an ESA approach and a traditional approach as they are currently used in Florida? The research questions were investigated through the use of an online survey, in-depth interviews, and analysis of three Florida case studies. Experts in the field of ecosystem services research were interviewed to assess how ESAs are used in Florida and to gather background information for the online survey and case studies. The target group for the online survey included respondents working for local, state, regional, federal and tribal government agencies, non-profit organizations, research institutes, universities, and other relevant persons who had been involved in projects in which ecosystem services were valuated, quantified, or described. The case studies that were assessed for this research are the Central Everglades Planning Project, the Florida Conservation Lands study, and the Tampa Bay Project. p>A Dissertation submitted to the Department of Urban and Regional Planning in partial fulfillment of the requirements for the degree of Doctor of Philosophy. p>Summer Semester 2015. p>May 19, 2015. p>Ecosystem Services, Integrated Systems Analysis, Natural-human Systems, Natural Resource Management, Sustainable Development, Valuation p>Timothy Chapin, Professor Directing Dissertation; Keith Ihlanfeldt, University Representative; Christopher Coutts, Committee Member; Jeffrey Chanton, Committee Member.p> Advisors/Committee Members: Timothy Stewart Chapin (professor directing dissertation), Keith R. Ihlanfeldt (university representative), Christopher Coutts (committee member), Jeffrey P. Chanton (committee member).

Subjects/Keywords: Human ecology; Study and teaching; City planning; Sustainability

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APA (6^th Edition):

Forkink, A. (2015). Ecosystem Services Assessments as a Planning Tool in Florida. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9600 ;

Chicago Manual of Style (16^th Edition):

Forkink, Annet. “Ecosystem Services Assessments as a Planning Tool in Florida.” 2015. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-9600 ;.

MLA Handbook (7^th Edition):

Forkink, Annet. “Ecosystem Services Assessments as a Planning Tool in Florida.” 2015. Web. 10 Apr 2021.

Vancouver:

Forkink A. Ecosystem Services Assessments as a Planning Tool in Florida. [Internet] [Doctoral dissertation]. Florida State University; 2015. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9600 ;.

Council of Science Editors:

Forkink A. Ecosystem Services Assessments as a Planning Tool in Florida. [Doctoral Dissertation]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9600 ;

Florida State University

8. Rogers, Kelsey. Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources.

Degree: PhD, Earth, Ocean, and Atmospheric Science, 2018, Florida State University

URL: http://purl.flvc.org/fsu/fd/2018_Su_Rogers_fsu_0071E_14610 ;

► The Deepwater Horizon (DWH) blowout of 2010 released an estimated 4.5-4.9 million barrels of oil and 500,000t of methane into the Gulf of Mexico (GOM).… (more)

▼ The Deepwater Horizon (DWH) blowout of 2010 released an estimated 4.5-4.9 million barrels of oil and 500,000t of methane into the Gulf of Mexico (GOM). Some of this oil rose to the surface, forming oil slicks, while an estimated 30% of the smaller particles and gasses formed a deep-water hydrocarbon plume between 1000-1200m (Ryerson et al., 2013; Valentine et al., 2010). The oil slicks at the surface covered a total area of 149,000km2 (MacDonald et al., 2015), but less than 0.01% of the gaseous hydrocarbons reached the surface (Kessler et al., 2011; Yvon-Lewis et al., 2011). After capping the wellhead and following natural and human remediation efforts, an estimated 11-30% of the oil was left unaccounted (Lehr et al., 2010). Studies of δ13C and Δ14C tracers in particulate organic carbon (POCsusp) in the water column and in sediments have shown the accumulation of fossil carbon in these pools. This dissertation explores the POC and sedimentary organic carbon pools using δ13C and Δ14C to characterize and track the recovery of these carbon pools following the DWH blowout. Due to the small particle size, residence time, and sensitivity to inputs, POCsusp provides a link between microbial processes in dissolved organic carbon and larger particles that pass carbon up the food web. Through this link we can evaluate the incorporation of hydrocarbons using δ13C and Δ14C. POCsusp was collected over 6 years from 43 sites across the Northern GOM. At the time of collection these sites were classified as seep or non-seep. We observed a wide range of natural variability in both δ13C (-17.8 to -35.4‰) and Δ14C (+71 to -755‰) throughout the water column. We found that deep-water POCsusp of the GOM was always more depleted than POCsusp from the euphotic zone. POCsusp collected from seeps was more depleted in Δ14C than non-seep sites. Endmember modeling indicated that in these particles, as much as 73% of the carbon was incorporated from oil. Four years following the blowout, we observed recovery in the Δ14C of deep-water POCsusp settling at a baseline of Δ14C=-164.4±18.9‰. We found the δ13C of POCsusp from the euphotic zone became more depleted over time, potentially due to the continuous incorporation of hydrocarbons. The deposition of oil in the sediments of the GOM has been estimated to be up to 14% of the total oil released (Valentine et al., 2014; Chanton et al, 2015), with marine oil snow as the primary mode of deposition. We employed inverse distance weighted interpolation to the surface sediment δ13C and Δ14C data. From these interpolations, we calculated the area affected by petrocarbon and followed its quantity through time. The area affected by petrocarbon decreased each year at a rate of -2x108 g/yr. Our maps indicated an east-west trend in depletion of both δ13C and Δ14C likely caused by the increasing importance of output from natural seeps and the Mississippi River. We also found significant differences between the sediment of the northern and southern GOM, with the north being much more depleted in δ13C and Δ14C than… Advisors/Committee Members: Jeffrey P. Chanton (professor directing dissertation), Tingting Zhao (university representative), Olivia Underwood Mason (committee member), Joseph Montoya (committee member), Yang Wang (committee member).

Subjects/Keywords: Chemical oceanography

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APA (6^th Edition):

Rogers, K. (2018). Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/2018_Su_Rogers_fsu_0071E_14610 ;

Chicago Manual of Style (16^th Edition):

Rogers, Kelsey. “Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources.” 2018. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/2018_Su_Rogers_fsu_0071E_14610 ;.

MLA Handbook (7^th Edition):

Rogers, Kelsey. “Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources.” 2018. Web. 10 Apr 2021.

Vancouver:

Rogers K. Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources. [Internet] [Doctoral dissertation]. Florida State University; 2018. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/2018_Su_Rogers_fsu_0071E_14610 ;.

Council of Science Editors:

Rogers K. Gulf of Mexico Recovery and Organic Matter Variability: A Tale of Two Sources. [Doctoral Dissertation]. Florida State University; 2018. Available from: http://purl.flvc.org/fsu/fd/2018_Su_Rogers_fsu_0071E_14610 ;

Florida State University

9. Gillis, Anthony John. Foraging Ecology and Diet Selection of Juvenile Green Turtles (Chelonia mydas) in the Western Bahamas: Insights from Stable Isotope Analysis and Prey Mapping.

Degree: MS, Earth, Ocean, and Atmospheric Science, 2018, Florida State University

URL: http://purl.flvc.org/fsu/fd/2018_Sp_Gillis_fsu_0071N_14539 ;

► Species’ foraging choices influences their somatic growth rates, age at maturity, and time spent in vulnerable early life stages. Thus, differences in population demographics are… (more)

▼ Species’ foraging choices influences their somatic growth rates, age at maturity, and time spent in vulnerable early life stages. Thus, differences in population demographics are often attributed to variability either in diet type, quality or quantity ingested. Knowledge of species diet selection, though currently limited, particularly in marine environments, can enhance our understanding of the roles of species in marine ecosystem and, at a finer scale, elucidate how nutrition and diet influences their growth and productivity. Marine green turtles (Chelonia mydas) are considered to be herbivores, predominantly consuming seagrass and algae. However, recent studies have suggested that they may exhibit omnivory in certain forage areas. Using juvenile green turtles as a case study, I coupled stable isotope analysis with a diet preference index to provide insights into the selection and plasticity of their diet. The study was conducted within two sites (Bonefish Hole and South Bimini) in Bimini, Bahamas in 2016. Habitat surveys were conducted to gather habitat data and determine resource availability. A dichotomy in diet was found between the sites: at Bonefish Hole, turtles exhibited a more generalist omnivorous diet, selecting for sessile filters feeders and green algae, whereas turtles in South Bimini had a more specialist herbivorous diet, primarily consuming seagrasses and selecting for red algae, when available. The foraging dichotomy found in this study by green turtles expands our understanding of the spatial differences in their biology in the Bahamas and provides novel information for turtle foraging in Bimini. Knowledge about differences in intra-specific diet, with a focus on diet selection and potential drivers, can elucidate the factors that influence critical life history traits and ultimately inform species management. p>A Thesis submitted to the Department of Earth, Ocean and Atmospheric Science in partial fulfillment of the requirements for the degree of Master of Science. p>Spring Semester 2018. p>April 13, 2018. p>Bayesian ellipses, carbon, habitat use, MixSIAR, nitrogen, Trophic ecology p>Mariana MPB Fuentes, Professor Directing Thesis; Jeff Chanton, Committee Member; Rob Spencer, Committee Member; Jeffrey A. Seminoff, Committee Member.p> Advisors/Committee Members: Mariana Fuentes (professor directing thesis), Jeffrey P. Chanton (committee member), Robert G. M. Spencer (committee member), Jeffrey A. Seminoff (committee member).

Subjects/Keywords: Marine biology; Ecology; Biology

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APA (6^th Edition):

Gillis, A. J. (2018). Foraging Ecology and Diet Selection of Juvenile Green Turtles (Chelonia mydas) in the Western Bahamas: Insights from Stable Isotope Analysis and Prey Mapping. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/2018_Sp_Gillis_fsu_0071N_14539 ;

Chicago Manual of Style (16^th Edition):

Gillis, Anthony John. “Foraging Ecology and Diet Selection of Juvenile Green Turtles (Chelonia mydas) in the Western Bahamas: Insights from Stable Isotope Analysis and Prey Mapping.” 2018. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/2018_Sp_Gillis_fsu_0071N_14539 ;.

MLA Handbook (7^th Edition):

Gillis, Anthony John. “Foraging Ecology and Diet Selection of Juvenile Green Turtles (Chelonia mydas) in the Western Bahamas: Insights from Stable Isotope Analysis and Prey Mapping.” 2018. Web. 10 Apr 2021.

Vancouver:

Gillis AJ. Foraging Ecology and Diet Selection of Juvenile Green Turtles (Chelonia mydas) in the Western Bahamas: Insights from Stable Isotope Analysis and Prey Mapping. [Internet] [Masters thesis]. Florida State University; 2018. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/2018_Sp_Gillis_fsu_0071N_14539 ;.

Council of Science Editors:

Gillis AJ. Foraging Ecology and Diet Selection of Juvenile Green Turtles (Chelonia mydas) in the Western Bahamas: Insights from Stable Isotope Analysis and Prey Mapping. [Masters Thesis]. Florida State University; 2018. Available from: http://purl.flvc.org/fsu/fd/2018_Sp_Gillis_fsu_0071N_14539 ;

Florida State University

10. Verbeke, Brittany Aiello. Peatland Organic Matter Chemistry Trends over a Global Latitudinal Gradient.

Degree: MS, Earth, Ocean, and Atmospheric Science, 2018, Florida State University

URL: http://purl.flvc.org/fsu/fd/2018_Sp_Verbeke_fsu_0071N_14561 ;

► Peatlands contain a significant amount of the global soil carbon, but the climate feedback affecting carbon stability within these peatland systems is still relatively unknown.… (more)

▼ Peatlands contain a significant amount of the global soil carbon, but the climate feedback affecting carbon stability within these peatland systems is still relatively unknown. Organic matter composition of peatlands plays a major role in determining carbon storage, and while high latitude peatlands seem to be the most sensitive to climate change, a global picture of peat organic matter chemistry is required to gauge overall peatland stability and to improve models of greenhouse gas emissions fueled by soil carbon decomposition. The goal of this research is to test the hypothesis that carbohydrate content, an indicator of soil organic matter lability or reactivity, will be lower in carbon deposits near the equator and greater in high latitude peatlands. Conversely we hypothesize that peat aromatic content will be higher at low latitudes relative to higher latitudes. As a part of the Global Peatland Microbiome Project (GPMP), around 1400 samples of peat across a latitudinal gradient from 79N to 65S were measured with Fourier transform infrared spectroscopy (FTIR) to examine the organic matter functional groups of peat. Carbohydrate and aromatic content, as determined by FTIR, are useful proxies of decomposition potential and recalcitrance, respectively. A highly significant relationship was observed between carbohydrate and aromatic content, latitude, and elevation. Carbohydrate contents of high latitude sites were significantly greater than at sites near the equator, in contrast to aromatic content which showed the opposite trend. It was also clear that at locations with similar latitudes but different elevations, the carbohydrate content was higher and aromatic content was lower at higher elevations. Higher carbohydrate content at higher latitudes indicates a greater potential for lability and resultant mineralization to form the greenhouse gases, carbon dioxide and methane, whereas the composition of low latitude peatlands is consistent with their apparent stability in the face of greater temperatures. The combination of low carbohydrates and high aromatics at warmer locations near the equator could foreshadow the organic matter composition of high latitude peat transitioning to a more recalcitrant form with a warming climate accompanying the evolution of greenhouse gases. p>A Thesis submitted to the Department of Earth, Ocean and Atmospheric Science in partial fulfillment of the requirements for the degree of Master of Science. p>Spring Semester 2018. p>April 16, 2018. p>Decomposition, FTIR, Latitude, Organic Matter, Peatlands, Stability p>Jeffrey Chanton, Professor Directing Thesis; Robert Spencer, Committee Member; Olivia Mason, Committee Member.p> Advisors/Committee Members: Jeffrey P. Chanton (professor directing thesis), Robert G. M. Spencer (committee member), Olivia Underwood Mason (committee member).

Subjects/Keywords: Biogeochemistry; Environmental sciences; Climatic changes

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APA (6^th Edition):

Verbeke, B. A. (2018). Peatland Organic Matter Chemistry Trends over a Global Latitudinal Gradient. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/2018_Sp_Verbeke_fsu_0071N_14561 ;

Chicago Manual of Style (16^th Edition):

Verbeke, Brittany Aiello. “Peatland Organic Matter Chemistry Trends over a Global Latitudinal Gradient.” 2018. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/2018_Sp_Verbeke_fsu_0071N_14561 ;.

MLA Handbook (7^th Edition):

Verbeke, Brittany Aiello. “Peatland Organic Matter Chemistry Trends over a Global Latitudinal Gradient.” 2018. Web. 10 Apr 2021.

Vancouver:

Verbeke BA. Peatland Organic Matter Chemistry Trends over a Global Latitudinal Gradient. [Internet] [Masters thesis]. Florida State University; 2018. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/2018_Sp_Verbeke_fsu_0071N_14561 ;.

Council of Science Editors:

Verbeke BA. Peatland Organic Matter Chemistry Trends over a Global Latitudinal Gradient. [Masters Thesis]. Florida State University; 2018. Available from: http://purl.flvc.org/fsu/fd/2018_Sp_Verbeke_fsu_0071N_14561 ;

Florida State University

11. Corbett, J. Elizabeth. Doc Reactivity in a Northern Minnesota Peatland.

Degree: PhD, Earth, Ocean and Atmospheric Sciences, 2012, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-6899 ;

► The DOC reactivity of a northern peatland was investigated by measuring and modeling concentrations, stable isotopes, and natural abundance radiocarbon of solid phase peat, DOC,… (more)

▼ The DOC reactivity of a northern peatland was investigated by measuring and modeling concentrations, stable isotopes, and natural abundance radiocarbon of solid phase peat, DOC, DIC, and CH4 in field and lab studies. We tested the hypotheses that 1) fen DOC is more labile than bog DOC, 2) modern DOC is advected downward from surface peat and respiration in deep peat is controlled by organic matter production at the surface, 3) the presence or absence of respiration pathways can be distinguished with stable isotopes, 4) isotope-mass balance calculations can be used to partition fractionating and non-fractionating CO2 production pathways, 5) and a DIR (depth integrated rate) model can be used to estimate production rates of CO2 and CH4 and to better constrain advection rates within the peat column. Fieldwork was done in Glacial Lake Agassiz Peatlands (GLAP) in Northern Minnesota. The GLAP terrain is flat which inhibits water drainage and results in carbon accumulation. Raised bogs and fens comprise the major ecosystems in this area. Bogs have lower pH values, lower water tables, and lower nutrient content than fens. Bogs vegetation is characterized by Sphagnum moss while fen vegetation is characterized by Carex plants. Because of the physical and biological differences in these two main environments, the DOC characteristics, pathways of CO2 and CH4 production, and rates of CO2 and CH4 production vary as well. DOC concentrations and DOC:DON values were lower in fens than bogs which suggests that fen DOC was more labile and subjected to more degradation than bog DOC. Fens contained twice as much LMW (low molecular weight) DOC (kDa) as bogs. The LMW DOC was determined to be older and more recalcitrant (because of higher DOC:DON values) than the HMW (high molecular weight) size fraction in both bogs and fens. This suggests that the presence of LMW DOC was a result of degradation processes which were more rapid in fens because of the greater lability of the bulk DOC. Bog DOC was shown to have higher fluorescence and aromaticity than fen DOC. Since fen DOC has been found to be more labile, higher fluorescence in a sample may be a sign of recalcitrance. Radiocarbon analysis was consistent with the hypothesis that fen DOC was more labile than bog DOC since the radiocarbon values of respiration products in the fen were comparable to values of fen DOC. In bogs, the radiocarbon values of respiration products were in between the radiocarbon values of the solid phase peat and the DOC which suggests that both the peat and DOC were substrates for bacteria in the bog. Both bogs and fens contained radiocarbon enriched DOC at depth while deep peat was radiocarbon depleted. Incubations of rinsed peat yielded DOC radiocarbon values that were similar to the peat. These results indicate that the modern DOC found in the peat column is most likely advected downward from more surficial layers and must come from another source other than the peat from the same layer. Stable isotope analysis of δ13C-DIC, δ13C-CH4, and δD-CH4 showed that bogs… Advisors/Committee Members: Jeffrey P. Chanton (professor directing dissertation), Yang Wang (university representative), William T. Cooper (committee member), Markus Huettel (committee member), Bill Burnett (committee member).

Subjects/Keywords: Earth sciences; Oceanography; Atmospheric sciences; Geophysics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Corbett, J. E. (2012). Doc Reactivity in a Northern Minnesota Peatland. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-6899 ;

Chicago Manual of Style (16^th Edition):

Corbett, J Elizabeth. “Doc Reactivity in a Northern Minnesota Peatland.” 2012. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-6899 ;.

MLA Handbook (7^th Edition):

Corbett, J Elizabeth. “Doc Reactivity in a Northern Minnesota Peatland.” 2012. Web. 10 Apr 2021.

Vancouver:

Corbett JE. Doc Reactivity in a Northern Minnesota Peatland. [Internet] [Doctoral dissertation]. Florida State University; 2012. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-6899 ;.

Council of Science Editors:

Corbett JE. Doc Reactivity in a Northern Minnesota Peatland. [Doctoral Dissertation]. Florida State University; 2012. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-6899 ;

Florida State University

12. Paeng, Jiyoung. Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments.

Degree: PhD, Earth, Ocean and Atmospheric Sciences, 2012, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5087 ;

► Fire-derived compounds have received considerable attention as a refractory form of dissolved organic carbon (DOC), the largest carbon pool in the ocean. Due to its… (more)

▼ Fire-derived compounds have received considerable attention as a refractory form of dissolved organic carbon (DOC), the largest carbon pool in the ocean. Due to its recalcitrant nature, pyrogenic or black carbon, which is produced by the incomplete combustion of biomass and fossil fuel on land, is an important compound for potential long-term carbon sequestration. The major objective of this dissertation was to test the hypothesis that dissolved pyrogenic organic carbon accounts for a significant fraction of DOC in different environmental systems, and that the distribution and transport of pyrogenic DOC may be an important key to understanding of how terrestrial and marine DOC are linked. To test this hypothesis, solid phase extraction of DOC was coupled with the benzene polycarboxylic acid (BPCA) method for accurate analysis of combustion-derived compounds in the Southern Ocean, rivers and estuaries in southeastern Brazil, Minnesota's peatlands, and the groundwater and coastal ocean of the Gulf of Mexico. The homogenous distribution of the thermogenic signatures including pyrogenic and non-pyrogenic sources found in marine DOC across whole water masses in the deep ocean indicated that thermogenic DOC can act as a long-term sink. Approximately 2% of the DOM in the deep ocean was determined to be of thermogenic origin, derived from ancient biomass burning, and, possibly, the geothermal flux in the deep sea. Dissolved pyrogenic carbon was found to account for up to 9 ± 2% of riverine and estuarine DOC. Pyrogenic DOC entering the watersheds in Brazil appeared to be derived mainly from former forest fires rather than current agricultural uses, in particular sugarcane burning. Dissolved pyrogenic carbon flux was affected by seasonal variability in runoff and water management in reservoirs. Inputs of pyrogenic DOC to the ocean via groundwater were identified, revealing groundwater discharge as a newly-discovered source of marine dissolved pyrogenic carbon. Large amounts of pyrogenic DOC were found in the peatlands of northern Minnesota. Such fire-derived materials are likely derived from old peat soil, thus, the export of aged condensed aromatic compounds from peatlands has implications for our understanding of the oceanic carbon cycle. Results of lignin phenols analysis indicated that the pyrogenic DOC in the peatlands might have originated from non-vascular plant-derived materials with highly altered lignin signatures. A multi-proxy approach, including both molecular tracers (BPCA and lignin oxidation products) and the stable carbon isotopic composition of bulk DOC, was adopted to investigate the sources and cycling of terrestrial and pyrogenic organic matter in a fire-impacted coastal watershed in the northern Gulf of Mexico. The distinct trends in the temporal and spatial variations of pyrogenic DOC in groundwater reflected the coupling of groundwater discharge and estuarine processes in creating the conditions for the transport of terrestrial DOC to the ocean. The calculated pyrogenic DOC flux transport by groundwater… Advisors/Committee Members: Jeffrey P. Chanton (professor directing dissertation), William T. Cooper (university representative), Thorsten Dittmar (committee member), Marcus Huettel (committee member), William Landing (committee member).

Subjects/Keywords: Earth sciences; Oceanography; Atmospheric sciences; Geophysics

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APA (6^th Edition):

Paeng, J. (2012). Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-5087 ;

Chicago Manual of Style (16^th Edition):

Paeng, Jiyoung. “Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments.” 2012. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-5087 ;.

MLA Handbook (7^th Edition):

Paeng, Jiyoung. “Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments.” 2012. Web. 10 Apr 2021.

Vancouver:

Paeng J. Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments. [Internet] [Doctoral dissertation]. Florida State University; 2012. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5087 ;.

Council of Science Editors:

Paeng J. Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments. [Doctoral Dissertation]. Florida State University; 2012. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5087 ;

Florida State University

13. Textor, Sadie. Dissolved Organic Carbon in Organic-Rich Aquatic Ecosystems: Biodegradability and an Assessment of the Priming Effect.

Degree: MS, Earth, Ocean, and Atmospheric Science, 2018, Florida State University

URL: http://purl.flvc.org/fsu/fd/2018_Su_Textor_fsu_0071N_14665 ;

► Rivers deliver approximately 260 Tg of dissolved organic carbon (DOC) to the ocean annually, yet there is little evidence of terrigenous DOC (tDOC) in the… (more)

▼ Rivers deliver approximately 260 Tg of dissolved organic carbon (DOC) to the ocean annually, yet there is little evidence of terrigenous DOC (tDOC) in the ocean. While tDOC was historically believed to be stable and resistant to microbial degradation, it has recently been shown that freshwater systems mineralize more tDOC than originally thought. Biodegradability of DOC is an overriding control on ecosystem respiration, regulating how much organic carbon is remineralized as CO2 or exported downstream, however, the processes controlling DOC degradation are not well understood. The priming effect is a possible mechanism by which inputs of biolabile DOC enhance the bioavailability of stable DOC components in aquatic systems, resulting in higher rates of microbial remineralization. Here we investigate microbial degradation of DOC by conducting bioincubation experiments and assessing a variety of biogeochemical controls on DOC biolability, including the priming effect, nutrient availability, seasonality, and chemical composition. The role of priming and nutrient availability was assessed through the inclusion of bioincubation treatments amended with nutrients and a variety of simple biolabile organic carbon substrates. Ultrahigh resolution mass spectrometry allowed us to characterize the molecular composition of dissolved organic matter (DOM) samples and understand how chemical composition may act as a driver of DOM biodegradability. This study was first conducted on blackwater systems in Florida, where we collected blackwater river samples and made leachates from plant litter that largely contributes to the terrestrial input of organic matter in these systems. Blackwaters consist of a diverse mixture of organic substances and are ideal study sites for assessing biodegradability of DOC and priming as they are rich in organic matter (i.e. high DOC concentrations), dominated by DOM that is highly aromatic in nature, and are historically believed to be a stable DOM pool. During the bioincubation experiments, blackwaters lost 6.10 ± 3.85% DOC within one month, while leachates lost 38.10 ± 16.74% DOC. There were no significant differences between DOC remineralization in control and ‘primed’ treatments, indicating that priming is not an important factor in the biodegradation of DOC in blackwater ecosystems. However, the proportion of biodegradable DOC (BDOC) and DOM composition were significantly correlated, mostly driven by the contribution of aliphatic compounds (H/C ≥ 1.5, O/C < 0.9) that were abundant (9.3 ± 5.2%) in leachate DOM. The molecular signature of biodegraded leachate DOM resembled that of stable blackwater DOM, indicating that bioavailable DOM components leached from plant litter are rapidly utilized and stable DOM is exported downstream. Further, we conducted this study on permafrost-influenced streams in the Yukon Flats of Interior Alaska, a region underlain by discontinuous permafrost that is experiencing rapidly warming temperatures, permafrost thaw, and associated changes in hydrology and vegetation, all… Advisors/Committee Members: Robert G. M. Spencer (professor directing thesis), Jeffrey P. Chanton (committee member), Olivia Underwood Mason (committee member).

Subjects/Keywords: Aquaculture

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Textor, S. (2018). Dissolved Organic Carbon in Organic-Rich Aquatic Ecosystems: Biodegradability and an Assessment of the Priming Effect. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/2018_Su_Textor_fsu_0071N_14665 ;

Chicago Manual of Style (16^th Edition):

Textor, Sadie. “Dissolved Organic Carbon in Organic-Rich Aquatic Ecosystems: Biodegradability and an Assessment of the Priming Effect.” 2018. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/2018_Su_Textor_fsu_0071N_14665 ;.

MLA Handbook (7^th Edition):

Textor, Sadie. “Dissolved Organic Carbon in Organic-Rich Aquatic Ecosystems: Biodegradability and an Assessment of the Priming Effect.” 2018. Web. 10 Apr 2021.

Vancouver:

Textor S. Dissolved Organic Carbon in Organic-Rich Aquatic Ecosystems: Biodegradability and an Assessment of the Priming Effect. [Internet] [Masters thesis]. Florida State University; 2018. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/2018_Su_Textor_fsu_0071N_14665 ;.

Council of Science Editors:

Textor S. Dissolved Organic Carbon in Organic-Rich Aquatic Ecosystems: Biodegradability and an Assessment of the Priming Effect. [Masters Thesis]. Florida State University; 2018. Available from: http://purl.flvc.org/fsu/fd/2018_Su_Textor_fsu_0071N_14665 ;

Florida State University

14. Taylor, Crystal. A Community Greenway Routed Near Schools: How It Was Planned and the Extent of Its Use by Schoolchildren.

Degree: PhD, Urban and Regional Planning, 2014, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9260 ;

► In this dissertation, I explore how a community in East Los Angeles, California planned a urban greenway routed by local schools and to what extent… (more)

▼ In this dissertation, I explore how a community in East Los Angeles, California planned a urban greenway routed by local schools and to what extent schoolchildren use the trail. Previous research has largely focused on greenways as a community amenity for adults. However in this study, I investigate schoolchildren's use of an urban rail-trail. With this greenway being routed near schools, I explore to what extent, if any, are schoolchildren using the greenway to actively travel to school. Though there is extensive literature on both greenways and active travel to school as discrete research topics, there is a gap in the literature concerning whether or not greenways can serve as an environmental support for children's active travel behavior to school. Concerning the research design, I used a single case study approach to document the critical case of the Whittier Greenway. After conducting a nation-wide search, I selected this case based on the following criteria. First, I located greenways routed near school properties. Second, I prioritized urban greenway sites over rural greenway sites. I selected Whittier, California because it has sufficient density where children's active travel to school is more likely to occur than in more rural settings. For the methodology, I interviewed key individuals who have historical knowledge of the trail, analyzed planning documentation, and retrieved archival resources to create a rich descriptive account of how the greenway was created. To determine children's greenway use and active travel behaviors, I employed survey methodology at three schools with property adjacent to the greenway: two elementary schools and one high school. One of the three schools has restrictive access to the greenway. Each school has a largely Latino student population. I used student surveys at the high school and parents surveys at the elementary schools. Both surveys are adapted from the nationally recognized Safe Routes to School survey to include greenway use and behavior questions. To determine children's use of the greenway, I employed descriptive statistics and performed a content analysis. Also, I ran descriptive statistics, a logistic regression, and a Pearson's Chi-Square analysis to address the extent that schoolchildren are using the greenway to travel to school. Concerning the findings, this case illustrates how a city planned and created an urban greenway. Serving as the catalyst that started the project and part of the general planning process, participation played a vital role in the creation of the Whittier Greenway. This case also reveals how one community successfully planned and constructed an urban rail-trail without the use of a city's general funds. A further analysis of the survey results reveals that both children and youth use the greenway as a recreational amenity. Though high school students use the greenway for recreation, their most common… Advisors/Committee Members: Christopher Coutts (professor directing dissertation), Jeffrey P. Chanton (university representative), Rebecca Miles (committee member), Timothy Stewart Chapin (committee member).

Subjects/Keywords: City planning; Sustainability

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APA (6^th Edition):

Taylor, C. (2014). A Community Greenway Routed Near Schools: How It Was Planned and the Extent of Its Use by Schoolchildren. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9260 ;

Chicago Manual of Style (16^th Edition):

Taylor, Crystal. “A Community Greenway Routed Near Schools: How It Was Planned and the Extent of Its Use by Schoolchildren.” 2014. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-9260 ;.

MLA Handbook (7^th Edition):

Taylor, Crystal. “A Community Greenway Routed Near Schools: How It Was Planned and the Extent of Its Use by Schoolchildren.” 2014. Web. 10 Apr 2021.

Vancouver:

Taylor C. A Community Greenway Routed Near Schools: How It Was Planned and the Extent of Its Use by Schoolchildren. [Internet] [Doctoral dissertation]. Florida State University; 2014. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9260 ;.

Council of Science Editors:

Taylor C. A Community Greenway Routed Near Schools: How It Was Planned and the Extent of Its Use by Schoolchildren. [Doctoral Dissertation]. Florida State University; 2014. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9260 ;

Florida State University

15. Rau, Erica. The Use of Stable Isotopes Deuterium and Oxygen-18 as Natural Hydrologic Tracers in a Florida Springshed.

Degree: MS, Earth, Ocean, and Atmospheric Science, 2016, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_2016SP_Rau_fsu_0071N_13042 ;

► To determine if the distinct deuterium (D) and oxygen-18 (18O) signature of precipitation from a tropical storm or hurricane could be used as a natural… (more)

▼ To determine if the distinct deuterium (D) and oxygen-18 (18O) signature of precipitation from a tropical storm or hurricane could be used as a natural tracer in a springshed, isotope analyses of water samples from Wakulla Spring in north Florida were done over the course of two Atlantic hurricane seasons. Water samples were collected between Feb. 10, 2012 and Aug. 27, 2012 and between March 19 and Oct. 21, 2013. Additionally, water samples and water quality data from a total of 20 springs in north and central Florida were collected between Jan. 14 and Feb. 18, 2012 during a period of prolonged drought; the springs were sampled again between Sept. 20 and Nov. 9, 2012 after rains in the summer and fall increased groundwater levels. The δD and δ18O values of the samples from the 21 springs, including Wakulla Spring, showed that the springs during non-baseflow conditions have much more variability in isotope composition than they had have during baseflow conditions. Comparison between the two sets of samples provided a range in isotope values for springs fed by the Upper Floridan aquifer. The 2012 hurricane season had one major storm, Tropical Storm Debby from June 23 to 27, which brought over 500 mm (20 in) of rain to the Wakulla Springs study area. A clear signal of the tropical storm was observed in the Wakulla Spring water samples as isotopically light rain recharged the aquifer and emerged at the spring. A minimum in δD (of -30‰)and δ18O (of -5.1‰)on July 4 to 5 indicated a mean transit time of nine days from the heavy rainfall that occurred on June 25 and 26. The average isotope values during baseflow prior to the storm were -17‰ δD and -3.3‰ for δ18O. The transit time was similar to travel times found by dye trace studies of the sinking streams in the springshed. The exact isotope composition for Tropical Storm Debby was not known, so there was not enough data to apply isotope-based hydrograph separation to the streamflow record for Wakulla River. The maximum measured streamflow was documented at 2,600 cfs by an acoustic Doppler current profiler measurement on June 26, 2012. During the 2013 hurricane season, rainfall was recorded and collected for isotope analysis. No major storms reached the study area during the 2013 Atlantic hurricane season except for a weakened Tropical Storm Andrea which brought a small amount of rain on June 6 (2.27 in, 58 mm). The precipitation had very negative isotope values (δD = -109‰ and δ18O = -14.7‰). A minimum δ18O value of -4.1‰ was seen in Wakulla Spring samples 29 and 33 days later but it was not clear if these values could be attributed to the very small amount of isotopically light precipitation since precipitation samples from a few other intense summer storms during the month had values slightly more negative than -4.1‰. The use of… Advisors/Committee Members: Yang Wang (professor co-directing thesis), Jeffrey P. Chanton (professor co-directing thesis), William M. Landing (committee member).

Subjects/Keywords: Hydrology

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APA (6^th Edition):

Rau, E. (2016). The Use of Stable Isotopes Deuterium and Oxygen-18 as Natural Hydrologic Tracers in a Florida Springshed. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2016SP_Rau_fsu_0071N_13042 ;

Chicago Manual of Style (16^th Edition):

Rau, Erica. “The Use of Stable Isotopes Deuterium and Oxygen-18 as Natural Hydrologic Tracers in a Florida Springshed.” 2016. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_2016SP_Rau_fsu_0071N_13042 ;.

MLA Handbook (7^th Edition):

Rau, Erica. “The Use of Stable Isotopes Deuterium and Oxygen-18 as Natural Hydrologic Tracers in a Florida Springshed.” 2016. Web. 10 Apr 2021.

Vancouver:

Rau E. The Use of Stable Isotopes Deuterium and Oxygen-18 as Natural Hydrologic Tracers in a Florida Springshed. [Internet] [Masters thesis]. Florida State University; 2016. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SP_Rau_fsu_0071N_13042 ;.

Council of Science Editors:

Rau E. The Use of Stable Isotopes Deuterium and Oxygen-18 as Natural Hydrologic Tracers in a Florida Springshed. [Masters Thesis]. Florida State University; 2016. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SP_Rau_fsu_0071N_13042 ;

Florida State University

16. Hodgkins, Suzanne Berenice. Changes in Organic Matter Chemistry and Methanogenesis Due to Permafrost Thaw in a Subarctic Peatland.

Degree: PhD, Earth, Ocean, and Atmospheric Science, 2016, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_2016SP_Hodgkins_fsu_0071E_13057 ;

► As the Arctic warms, the ~277 Pg of carbon stored in permafrost peatlands faces an uncertain fate. Arctic and Subarctic peatlands are likely to release… (more)

▼ As the Arctic warms, the ~277 Pg of carbon stored in permafrost peatlands faces an uncertain fate. Arctic and Subarctic peatlands are likely to release more methane (CH4) as permafrost thaw releases formerly-frozen carbon, thaw-induced land subsidence and inundation lead to anaerobic conditions, and higher temperatures allow more rapid decomposition. In addition to these effects, CH4 and carbon dioxide (CO2) emissions may also change due to shifts in plant inputs and consequent changes in organic matter quality, but the exact relationships between organic matter and CH4 production are not well understood. In this study, we examined microbial CH4 and CO2 production and their relationship to organic matter chemistry in Stordalen Mire, a thawing Subarctic peatland in northern Sweden. We also used stable carbon isotopes (δ13C) of CH4 and CO2, and their apparent fractionation factor (αC), to examine the effect of thaw on the proportion of methanogenesis by hydrogenotrophic or acetoclastic pathways. At Stordalen, permafrost thaw causes dry, aerobic permafrost plateaus (palsas) to collapse and become inundated. These wet depressions are then colonized first by Sphagnum mosses and then by sedges as permafrost thaw and plant succession progress. In our study, we examined a chronosequence of sites with varying permafrost status and plant community composition. These sites included dry, intact palsas; recently-thawed collapsed palsa sinkholes; partially-thawed Sphagnum-dominated bogs; mostly-thawed poor fens with a combination of Sphagnum and tall sedges; and fully-thawed rich fens with mature stands of tall sedges and no Sphagnum. The changes in potential CH4 and CO2 production along the thaw progression were examined with anaerobic peat incubations, which were all performed with identical temperature and water saturation. These incubations showed increases in potential decomposition rates and CH4/CO2 production ratios along the thaw progression. Methanogenesis pathways also shifted from predominately hydrogenotrophic to acetoclastic, as revealed by lower αC in fens. These shifts are consistent with increasing organic matter bioavailability along the thaw progression, which was confirmed by analyses of peat and dissolved organic matter (DOM) chemistry. These analyses showed that compared to collapsed palsas and bogs, rich fens had lower peat C/N ratios, higher peat humification rates (as determined by Fourier-transform infrared [FTIR] spectroscopy), and more labile DOM compounds (as determined by Fourier-transform ion cyclotron resonance mass spectrometry [FT-ICR MS]). The validity of these incubations for revealing trends in in situ CH4 and CO2 production was determined by comparison with dissolved CH4 and CO2 in field-collected pore water. The incubation CH4/CO2 ratios were … Advisors/Committee Members: Jeffrey P. Chanton (professor directing dissertation), Alan G. (Alan George) Marshall (university representative), William M. Landing (committee member), Yang Wang (committee member), William C. Burnett (committee member), Patrick Crill (committee member).

Subjects/Keywords: Biogeochemistry

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APA (6^th Edition):

Hodgkins, S. B. (2016). Changes in Organic Matter Chemistry and Methanogenesis Due to Permafrost Thaw in a Subarctic Peatland. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2016SP_Hodgkins_fsu_0071E_13057 ;

Chicago Manual of Style (16^th Edition):

Hodgkins, Suzanne Berenice. “Changes in Organic Matter Chemistry and Methanogenesis Due to Permafrost Thaw in a Subarctic Peatland.” 2016. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_2016SP_Hodgkins_fsu_0071E_13057 ;.

MLA Handbook (7^th Edition):

Hodgkins, Suzanne Berenice. “Changes in Organic Matter Chemistry and Methanogenesis Due to Permafrost Thaw in a Subarctic Peatland.” 2016. Web. 10 Apr 2021.

Vancouver:

Hodgkins SB. Changes in Organic Matter Chemistry and Methanogenesis Due to Permafrost Thaw in a Subarctic Peatland. [Internet] [Doctoral dissertation]. Florida State University; 2016. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SP_Hodgkins_fsu_0071E_13057 ;.

Council of Science Editors:

Hodgkins SB. Changes in Organic Matter Chemistry and Methanogenesis Due to Permafrost Thaw in a Subarctic Peatland. [Doctoral Dissertation]. Florida State University; 2016. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SP_Hodgkins_fsu_0071E_13057 ;

Florida State University

17. Mwashote, Benjamin Mkoji. Submarine Groundwater Discharge: Its Measurement and Implications for Nutrient Inputs and Biogeochemical Processes in the Nearshore Coastal Zone.

Degree: PhD, Earth, Ocean and Atmospheric Sciences, 2010, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-2154 ;

► Submarine groundwater discharge (SGD) assessments conducted both in the laboratory and at a field site in the northeastern Gulf of Mexico, using a continuous-heat type… (more)

▼ Submarine groundwater discharge (SGD) assessments conducted both in the laboratory and at a field site in the northeastern Gulf of Mexico, using a continuous-heat type automated seepage meter (seepmeter) have shown that the device has the potential of providing long-term, high-resolution measurements of SGD. The improvements on the device using a simple inexpensive laboratory set up, have shown that: (1) connecting an extension cable to the seepmeter has a negligible effect on its measuring capability and, (2) influence of very low temperature (≤ 3 ºC) on seepmeter measurements can be accounted for by conducting calibrations at such temperatures prior to field deployments and, (3) salinity had no significant effect on the performance of the seepmeter. Calibration results from fresh water and sea water showed close agreement at a 95% confidence level significance between the data sets from the two media (R2 = 0.98). The observed artifacts on seepmeter measurements associated with Bernoulli-induced flow, the vertically directed flow arising due to water movement across topographic features can significantly be reduced by burying (or submerging) the seepmeter to nearly the same level as the sediment topography. While the study revealed that in general wind speeds > 6 m/s were associated with enhanced SGD measurements in seepmeters with buried and unburied benthic chambers, the influence was greater in the unburied meters, and more pronounced for SGD rates 6 m/s were associated with enhanced SGD measurements in seepmeters with buried and unburied benthic chambers, the influence was greater in the unburied meters, and more pronounced for SGD rates Study of the Sarasota Bay (SB) system revealed SGD advection rates ranging from 0.7 to 24.0 cm/day, except for rare isolated hot spot occurrences where higher rates were observed. In general, SGD estimates were relatively higher in the middle and south regions (5.9 – 24.0 cm/day) compared to the north region (0.7 – 5.9 cm/day). Although no obvious seawater nutrient concentration trend was revealed, the average N/P ratio was higher in the north compared to the middle and south regions of the SB system. The importance of SGD was evident in that about 40% of the regional nutrient fluxes were observed in the north while ~ 60% occurred in the middle and south regions combined. The latter two regions also had the highest overall nutrient flux per water volume ratio, compared to the north region, thus making them potentially more vulnerable to eutrophic conditions. On average, we estimate about 27% of total dissolved N in the SB system was derived via SGD. p>A Dissertation Submitted to the Department of Earth, Ocean and Atmospheric Science in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy. p>Fall Semester, 2010. p>August 26, 2010. p>hydrology, Submarine groundwater discharge, groundwater, seepage meter, seepage meter artifacts, Florida, nutrients, nutrient fluxes, marine environment, nearshore, processes, measurements, coastal zone, Turkey…p> Advisors/Committee Members: William C. Burnett (professor directing dissertation), Xiaolong Bill Hu (university representative), Jeffrey P. Chanton (committee member), William M. Landing (committee member), Joel E. Kostka (committee member).

Subjects/Keywords: Oceanography; Atmospheric sciences; Meteorology

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APA (6^th Edition):

Mwashote, B. M. (2010). Submarine Groundwater Discharge: Its Measurement and Implications for Nutrient Inputs and Biogeochemical Processes in the Nearshore Coastal Zone. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-2154 ;

Chicago Manual of Style (16^th Edition):

Mwashote, Benjamin Mkoji. “Submarine Groundwater Discharge: Its Measurement and Implications for Nutrient Inputs and Biogeochemical Processes in the Nearshore Coastal Zone.” 2010. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-2154 ;.

MLA Handbook (7^th Edition):

Mwashote, Benjamin Mkoji. “Submarine Groundwater Discharge: Its Measurement and Implications for Nutrient Inputs and Biogeochemical Processes in the Nearshore Coastal Zone.” 2010. Web. 10 Apr 2021.

Vancouver:

Mwashote BM. Submarine Groundwater Discharge: Its Measurement and Implications for Nutrient Inputs and Biogeochemical Processes in the Nearshore Coastal Zone. [Internet] [Doctoral dissertation]. Florida State University; 2010. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-2154 ;.

Council of Science Editors:

Mwashote BM. Submarine Groundwater Discharge: Its Measurement and Implications for Nutrient Inputs and Biogeochemical Processes in the Nearshore Coastal Zone. [Doctoral Dissertation]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-2154 ;

Florida State University

18. Harper, Alexandra Rose. The Biogeochemical Cycle of Mercury in the Northern Gulf of Mexico as Constrained by Carbon, Nitrogen, Sulfur, and Mercury Isotopic Ratios in Marine Fish.

Degree: PhD, Earth, Ocean, and Atmospheric Science, 2016, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_2016SP_Harper_fsu_0071E_13021 ;

► Mercury (Hg) in the environment has deleterious ecological and health affects for humans and wildlife and is primarily transferred to humans through the consumption of… (more)

▼ Mercury (Hg) in the environment has deleterious ecological and health affects for humans and wildlife and is primarily transferred to humans through the consumption of marine biota (USEPA, 2001). These ecological and health concerns are exacerbated by the production of methylmercury (CH3Hg+; MMHg) in aquatic ecosystems. Sulfur isotopes (δ34S) are an indicator of the strength of sulfate reduction associated with MMHg production. In chapter 1, we assessed the relationship between MMHg concentrations and reduced-sulfur stable isotope δ34S signals in four coastal consumer organisms (length = 26–75 mm) from Florida's Big Bend seagrass meadows: pinfish (Lagodon rhomboides); pigfish (Orthopristis chrysopter); black sea bass (Centropristis striata melana); and shrimp (Tozeuma carolinense and T. serratum). We found a significant correlation between depleted δ34S signatures in fauna tissue (R2 = 0.27; p < 0.001; total n = 179) with higher MMHg concentrations. A correlation was observed in lower δ34S isotopic signatures and higher MMHg concentrations of consumers from the southern region of the study area indicating a "hotspot" of net mercury methylation in the sediments near Tampa Bay, Florida. To better understand the sources of Hg to coastal pinfish and to assess the contribution of pinfish annual egress to offshore food webs, chapter 2 applies isotopic tracing (C, N, S) combined with mercury (Hg) concentrations and isotope ratios in sediments, juvenile pinfish, juvenile gag grouper (Mycteropera microlepis), and adult gag grouper and pinfish to assess exposure pathways of MMHg in the northeastern Gulf of Mexico. We found that pinfish from the northern and southern Big Bend regions had distinct Hg sources. Southern pinfish had enriched δ202Hg and, when combined with lower pinfish δ34S values and lower sediment δ202Hg values, suggested elevated microbial methylation/demethylation in the southern region. The southern, coastal pinfish exhibited similar Δ199Hg as offshore gag grouper suggesting pinfish from this region represent an important Hg source to offshore reef fish species and/or these two cohorts are exposed to the same Hg source. Results suggested that estuaries can be an important source of MMHg to adjacent, offshore commercially important reef species and confirmed the utility of Hg isotope analysis to identify multiple marine Hg sources and inform our understanding of the pathways of MMHg bioaccumulation in estuarine food webs. In the northern Gulf of Mexico (nGOM), the Hg cycle is further complicated by the influence of the Mississippi River (MR) and potentially confounded, since April 2010, by the Deepwater Horizon (DWH) oil spill. Approximately 3.0-4.9% of oil-derived carbon released during the Deepwater Horizon oil spill was deposited on the seafloor (Chanton et … Advisors/Committee Members: Jeffrey P. Chanton (professor co-directing dissertation), William M. Landing (professor co-directing dissertation), Xiaojun Yang (university representative), Yang Wang (committee member), R. Dean (Ralph Dean) Grubbs (committee member).

Subjects/Keywords: Biogeochemistry; Chemical oceanography; Toxicology

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APA (6^th Edition):

Harper, A. R. (2016). The Biogeochemical Cycle of Mercury in the Northern Gulf of Mexico as Constrained by Carbon, Nitrogen, Sulfur, and Mercury Isotopic Ratios in Marine Fish. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2016SP_Harper_fsu_0071E_13021 ;

Chicago Manual of Style (16^th Edition):

Harper, Alexandra Rose. “The Biogeochemical Cycle of Mercury in the Northern Gulf of Mexico as Constrained by Carbon, Nitrogen, Sulfur, and Mercury Isotopic Ratios in Marine Fish.” 2016. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_2016SP_Harper_fsu_0071E_13021 ;.

MLA Handbook (7^th Edition):

Harper, Alexandra Rose. “The Biogeochemical Cycle of Mercury in the Northern Gulf of Mexico as Constrained by Carbon, Nitrogen, Sulfur, and Mercury Isotopic Ratios in Marine Fish.” 2016. Web. 10 Apr 2021.

Vancouver:

Harper AR. The Biogeochemical Cycle of Mercury in the Northern Gulf of Mexico as Constrained by Carbon, Nitrogen, Sulfur, and Mercury Isotopic Ratios in Marine Fish. [Internet] [Doctoral dissertation]. Florida State University; 2016. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SP_Harper_fsu_0071E_13021 ;.

Council of Science Editors:

Harper AR. The Biogeochemical Cycle of Mercury in the Northern Gulf of Mexico as Constrained by Carbon, Nitrogen, Sulfur, and Mercury Isotopic Ratios in Marine Fish. [Doctoral Dissertation]. Florida State University; 2016. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SP_Harper_fsu_0071E_13021 ;

Florida State University

19. Russell, Lee. Volume Pulsation of Small Gas Bubbles in the Surface Layer of Coastal Sands Caused by Surface Gravity Waves.

Degree: PhD, Earth, Ocean, and Atmospheric Science, 2015, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_2015fall_Russell_fsu_0071E_12931 ;

► In the uppermost millimeters of shallow submerged coastal sediments, photosynthesis by microalgae and cyanobacteria during daylight hours can cause oxygen supersaturation of sediment porewater, leading… (more)

▼ In the uppermost millimeters of shallow submerged coastal sediments, photosynthesis by microalgae and cyanobacteria during daylight hours can cause oxygen supersaturation of sediment porewater, leading to bubble formation. In shallow water depths, the seabed is affected by the pressure maximum beneath the wave crest and pressure minimum beneath the wave trough. While the photosynthetically-generated gas bubbles persist within the surface layer highly permeable sand sediments, they may be exposed to pressure pulsations caused by tides and passing surface gravity waves, because pressure is not significantly attenuated in the upper few centimeters of permeable sediments. The question arises, whether the tens of thousands of millimeter-size bubbles that are produced on sunny days in each square meter of nearshore sands respond to these pressure oscillations and if so, what consequences these responses may have. The main goals of the research thus were the demonstration of the bubble pulsation within the sediment and the quantification of the pore water flow, associated interfacial solute flux, and sand grain movement caused by the pulsation. The central working hypotheses tested in this research were: 1) Millimeter-size photosynthetic gas bubbles buried in the surface layer of submerged permeable coastal sands respond to passing surface gravity waves by volume changes leading to bubble volume pulsation. 2) This bubble volume pulsation causes pore water flows and thereby exchange across the sediment-water interface and an increase of the net solute flux from the sediment. 3) The bubble volume pulsation causes sand grain movement and thereby local sediment compaction, alteration of sediment surface topography and vertical transport of substances attached to the sand grains. These three working hypotheses were addressed in Thesis chapters 1, 2 and 3, respectively. In-situ video observations with a buried camera showed that the bubbles (1-3 mm diameter) buried in the surface layer ([less than] 10 cm) of nearshore sand respond to passing waves by volume pulsation and allowed estimation of the oscillating volume change of the bubbles visible in the sediment-cross section. These observations revealed bubble volume oscillation with compressions of 7.4% caused by ~1 meter water waves producing a temporary 10 kPa pressure increase. Laboratory measurements in a custom-built pressure tank confirmed the in-situ observations: Bubbles with 1.24 mm to 2.12 mm diameter (1 mm3 to 5 mm3), embedded in transparent Nafion[TM] sand sediment, at 1 m water depth were compressed by 8.7 ± 1.3 % of their volume when exposed to the same pressure increase of 10 kPa as produced by a 1 meter water wave. With an observed abundance of 50,000 bubbles m-2 in sandy Gulf of Mexico sediments, the pulsation of bubbles with 2 mm diameter produced by the passing of thirty 1 m-waves per… Advisors/Committee Members: Markus Huettel (professor directing dissertation), Jeanette L. Wulff (university representative), Ian R. (Ian Rosman) MacDonald (committee member), Jeffrey P. Chanton (committee member), William Dewar (committee member).

Subjects/Keywords: Marine biology; Biogeochemistry; Environmental sciences

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APA (6^th Edition):

Russell, L. (2015). Volume Pulsation of Small Gas Bubbles in the Surface Layer of Coastal Sands Caused by Surface Gravity Waves. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2015fall_Russell_fsu_0071E_12931 ;

Chicago Manual of Style (16^th Edition):

Russell, Lee. “Volume Pulsation of Small Gas Bubbles in the Surface Layer of Coastal Sands Caused by Surface Gravity Waves.” 2015. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_2015fall_Russell_fsu_0071E_12931 ;.

MLA Handbook (7^th Edition):

Russell, Lee. “Volume Pulsation of Small Gas Bubbles in the Surface Layer of Coastal Sands Caused by Surface Gravity Waves.” 2015. Web. 10 Apr 2021.

Vancouver:

Russell L. Volume Pulsation of Small Gas Bubbles in the Surface Layer of Coastal Sands Caused by Surface Gravity Waves. [Internet] [Doctoral dissertation]. Florida State University; 2015. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_Russell_fsu_0071E_12931 ;.

Council of Science Editors:

Russell L. Volume Pulsation of Small Gas Bubbles in the Surface Layer of Coastal Sands Caused by Surface Gravity Waves. [Doctoral Dissertation]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_Russell_fsu_0071E_12931 ;

Florida State University

20. Rowland, Steven Michael. Characterization of Oxygen-Containing Compounds in Crude Oils by Chromatographic and Mass Spectral Analysis.

Degree: PhD, Chemistry and Biochemistry, 2015, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9673 ;

► The chemical complexity of crude oil, arguably the most complex mixture in the world, has been addressed over the past decade by ultrahigh resolution FT-ICR… (more)

▼ The chemical complexity of crude oil, arguably the most complex mixture in the world, has been addressed over the past decade by ultrahigh resolution FT-ICR MS. FT-ICR MS has shown to be well suited to complex mixture analysis, and the mass accuracy and resolving power of FT-ICR MS provides the ability to assign unique chemical formulas to observed petroleum compounds. Although FT-ICR MS has proven a useful technique for petroleum characterization, the complexity of increasingly heavy crude oils challenges even the highest resolution mass spectrometers. The work presented here utilizes chromatographic separations to enhance the information derived from crude oil analysis by FT-ICR MS. Organic acids found in crude oils are known to cause corrosion, emulsions, and deposit formations during the production and refining processes. Aminopropyl silica was used to separation carboxylic acid compounds (i.e., naphthenic acids) from crude oil. This separation also fractionates acids by molecular weight and provides insight into previously undetected high molecular weight acids. Tetraprotic carboxylic acids (i.e., ARN acids) were also targeted by aminopropyl silica separation and further targeted by ammonia gas treatment. The combination of techniques provides a fast and effective measurement for the determination of ARN acids in crude oils. Oxidation of crude oils after environmental spills has been previously reported. Unprecedented oxidation of crude oil was recently observed from the Deepwater Horizon oil spill. The weathering process created tens-of-thousands of newly observed oil transformation products. Previous analysis by FT-ICR MS has catalogued these transformation products, but limited information was determined with regard to oxygen functionalities. The coupling of liquid chromatography and FT-ICR MS, as well as derivatization techniques, provided insight into crude oil oxidation products collected from the Gulf of Mexico. Asphaltenes have been referred to as the "bad actors" of petroleum because of their propensity to fall out of solution and form devastating deposits in wells and pipelines. Additives known as asphaltene inhibitors are often added to oil wells to prevent deposition. Quantitation of chemical additives is imperative to understanding their efficiency. Here LC-MS was utilized to determine the concentration of an asphaltene inhibitor additive in crude oil. p>A Dissertation submitted to the Department of Chemistry and Biochemistry in partial fulfillment of the requirements for the degree of Doctor of Philosophy. p>Spring Semester, 2015. p>January 8, 2015. p>ARN Acid, FT-ICR MS, High resolution mass spectrometry, Naphthenic acids, Petroleomics, Weathered oil p>Alan G. Marshall, Professor Directing Dissertation; Jeffery P. Chanton, University Representative; John G. Dorsey, Committee Member; Naresh S. Dalal, Committee Member; Ryan P. Rodgers, Committee Member.p> Advisors/Committee Members: Alan G. Marshall (professor directing dissertation), Jeffrey P. Chanton (university representative), John G. Dorsey (committee member), Naresh S. Dalal (committee member), Ryan P. Rodgers (committee member).

Subjects/Keywords: Chemistry

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APA (6^th Edition):

Rowland, S. M. (2015). Characterization of Oxygen-Containing Compounds in Crude Oils by Chromatographic and Mass Spectral Analysis. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9673 ;

Chicago Manual of Style (16^th Edition):

Rowland, Steven Michael. “Characterization of Oxygen-Containing Compounds in Crude Oils by Chromatographic and Mass Spectral Analysis.” 2015. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-9673 ;.

MLA Handbook (7^th Edition):

Rowland, Steven Michael. “Characterization of Oxygen-Containing Compounds in Crude Oils by Chromatographic and Mass Spectral Analysis.” 2015. Web. 10 Apr 2021.

Vancouver:

Rowland SM. Characterization of Oxygen-Containing Compounds in Crude Oils by Chromatographic and Mass Spectral Analysis. [Internet] [Doctoral dissertation]. Florida State University; 2015. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9673 ;.

Council of Science Editors:

Rowland SM. Characterization of Oxygen-Containing Compounds in Crude Oils by Chromatographic and Mass Spectral Analysis. [Doctoral Dissertation]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9673 ;

Florida State University

21. Wilson, Rachel Marie. Using Chemical Tracers to Evaluate Feeding Habits in Coastal Marine Ecosystems: Stable Isotopes and Organic Contaminants.

Degree: PhD, Earth, Ocean and Atmospheric Sciences, 2010, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0901 ;

► The use of chemical tracers to understand ecosystem interactions in the marine environment has gained increasing popularity over the past three decades. Carbon isotope abundances… (more)

▼ The use of chemical tracers to understand ecosystem interactions in the marine environment has gained increasing popularity over the past three decades. Carbon isotope abundances in organic matter sources in the marine system vary significantly making them a useful tracer for discriminating among such sources. Once taken up by primary producers, carbon isotope abundances are conservative throughout the food web. This allows us to measure carbon isotope abundances in secondary (and above) consumers and infer organic matter source utilization in the system. Nitrogen isotope abundances, unlike carbon, are not conservative throughout the food web. However, they do fractionate predictably providing a tool by which to measure trophic level of consumer species. Sulfur isotopes, like carbon, differ among sources and are also conservative within the food web providing an additional tracer with which to estimate source contributions. However, concerns about the "dirtiness" of sulfur for analysis purposes put sulfur on the back burner as an ecosystem tracer. With recent improvements in technology and the need for multiple tracers in multi-source systems, sulfur isotope abundance measurements have experienced a resurgence. In this manuscript we use sulfur isotope abundances as a second tracer (with carbon isotope abundances) to estimate organic matter source utilization by consumers in a variety of habitats along the Florida Big Bend coastline. We begin our isotopic analysis of consumers in a Northwest Gulf of Mexico, freshwater dominated estuarine system, Apalachicola Bay, Florida (USA). In Chapter II we evaluate isotopic variation with body size to determine the smallest trophic unit in our system. In Chapter III we develop a concentration-corrected, dual-isotope, multi-source evaluation of organic matter utilization incorporating sulfur as a secondary tracer. We then go on to apply the results of this model to determine trophic level of consumers in Apalachicola Bay based on nitrogen isotope abundance data. In Chapter IV we demonstrate how isotopic variation of sources within a system can confound our interpretations of trophic structure using these methods. We further demonstrate that, in addition to isotopic variation, source inputs and availability may also vary within a given system. This makes comparison among sites more difficult and highlights the need to evaluate isotopic variation in individual systems prior to making comparisons or widespread generalizations about interactions. In Chapter V we apply these methods to a coastal seagrass community. We evaluate isotopic abundances in sources in consumers from the site. Then we apply the mixing model we develop in Chapter II to determine organic matter source utilization by consumers. Finally, we evaluate trophic level of individual consumers and trophic structure of the system based on nitrogen isotopic abundances. We demonstrate that source isotopic abundances differ from those same sources in the freshwater estuarine habitats. We also show that, while benthic organic… Advisors/Committee Members: Jeffrey P. Chanton (professor directing dissertation), William T. Cooper (university representative), Douglas P. Nowacek (committee member), John R. Kucklick (committee member), Yang Wang (committee member), William C. Burnett (committee member).

Subjects/Keywords: Oceanography; Atmospheric sciences; Meteorology

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APA (6^th Edition):

Wilson, R. M. (2010). Using Chemical Tracers to Evaluate Feeding Habits in Coastal Marine Ecosystems: Stable Isotopes and Organic Contaminants. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-0901 ;

Chicago Manual of Style (16^th Edition):

Wilson, Rachel Marie. “Using Chemical Tracers to Evaluate Feeding Habits in Coastal Marine Ecosystems: Stable Isotopes and Organic Contaminants.” 2010. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-0901 ;.

MLA Handbook (7^th Edition):

Wilson, Rachel Marie. “Using Chemical Tracers to Evaluate Feeding Habits in Coastal Marine Ecosystems: Stable Isotopes and Organic Contaminants.” 2010. Web. 10 Apr 2021.

Vancouver:

Wilson RM. Using Chemical Tracers to Evaluate Feeding Habits in Coastal Marine Ecosystems: Stable Isotopes and Organic Contaminants. [Internet] [Doctoral dissertation]. Florida State University; 2010. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0901 ;.

Council of Science Editors:

Wilson RM. Using Chemical Tracers to Evaluate Feeding Habits in Coastal Marine Ecosystems: Stable Isotopes and Organic Contaminants. [Doctoral Dissertation]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0901 ;

Florida State University

22. Heil, Austin David. Life History, Diet, and Reproductive Dynamics of the Sheepshead (Archosargus Probatocephalus) in the Northeastern Gulf of Mexico.

Degree: MS, Earth, Ocean, and Atmospheric Science, 2017, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_SUMMER2017_Heil_fsu_0071N_14125 ;

► Sheepshead (Archosargus probatocephalus) are a popular recreational fisheries species in the Gulf of Mexico. Unfortunately, the highest reported catch of this species occurs primarily during… (more)

▼ Sheepshead (Archosargus probatocephalus) are a popular recreational fisheries species in the Gulf of Mexico. Unfortunately, the highest reported catch of this species occurs primarily during their reproductive period. As a result, fishers have expressed their concerns to management about a potential overharvest. This research attempts to fill in the biological gaps for Sheepshead in order to provide management with information that will ensure future successful management practices. The specific goals of this research are to: (1) examine the life history of Sheepshead in the northeastern Gulf of Mexico (NE GOM), (2) understand the prey composition and feeding habits during their reproductive period, (3) determine the distribution of spawning adults, and (4) assess the spatial and temporal changes in abundance and population demographics on offshore sites. Sheepshead were captured from three unique habitats (nearshore estuaries, Sikes Cut, and offshore reefs) from January 2016- April 2017 in the NE GOM. Sheepshead were sampled exclusively during their reproductive period, which is from January through May, using a variety of different fishing methods. Otoliths were removed, sectioned and aged for 224 individuals. Von Bertalanffy growth equations were fit to the length-at-age data from this region. Growth was found to be variable across their geographic range. Maximum asymptotic length (441mm) and growth rate (0.24) were consistent with previous studies in Florida. Average age of Sheepshead was much higher than in other regions of Florida, potentially due to habitat degradation and development in the regions like Tampa Bay compared to the lack of development along the NE GOM’s “Forgotten Coast”. Stomach and intestinal contents were removed, identified to the highest taxonomic level, and the volumes were enumerated to assess for fullness. Contents and stomach fullness were compared across habitats. Multidimensional scaling plots with presence absence transformation of Sheepshead stomach content data were created using a Bray–Curtis similarity matrix. A one-way ANOSIM showed no significant (p=0.79) difference in Sheepshead diet by habitat type. This suggested feeding habits overlapped across habitat type. This could be a result of (1) similar prey items across habitats, (2) movement between habitats, or (3) different digestion rates of hard-bodied organisms. Sheepshead exhibited proportionally more empty stomachs and lower fullness scores offshore. Feeding was less frequent on offshore reefs, which could be due to less prey, energy reserves from past feeding events, or more focus on spawning. Gonads were removed, weighed, and either macroscopically staged (males), or histologically staged (females). Gonadosomatic indices, spawning activity, and histological stage were compared across three habitat sites. A higher proportion of active and imminent spawning individuals were found on offshore reefs and at Sikes Cut. Nearshore habitats exhibited a low proportion of spawning activity. This suggested nearshore habitats were… Advisors/Committee Members: Sandra Brooke (professor co-directing thesis), Jeffrey P. Chanton (professor co-directing thesis), Markus Huettel (committee member), Amy R. (Amy Rose) Baco-Taylor (committee member).

Subjects/Keywords: Marine biology

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APA (6^th Edition):

Heil, A. D. (2017). Life History, Diet, and Reproductive Dynamics of the Sheepshead (Archosargus Probatocephalus) in the Northeastern Gulf of Mexico. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_SUMMER2017_Heil_fsu_0071N_14125 ;

Chicago Manual of Style (16^th Edition):

Heil, Austin David. “Life History, Diet, and Reproductive Dynamics of the Sheepshead (Archosargus Probatocephalus) in the Northeastern Gulf of Mexico.” 2017. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_SUMMER2017_Heil_fsu_0071N_14125 ;.

MLA Handbook (7^th Edition):

Heil, Austin David. “Life History, Diet, and Reproductive Dynamics of the Sheepshead (Archosargus Probatocephalus) in the Northeastern Gulf of Mexico.” 2017. Web. 10 Apr 2021.

Vancouver:

Heil AD. Life History, Diet, and Reproductive Dynamics of the Sheepshead (Archosargus Probatocephalus) in the Northeastern Gulf of Mexico. [Internet] [Masters thesis]. Florida State University; 2017. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_SUMMER2017_Heil_fsu_0071N_14125 ;.

Council of Science Editors:

Heil AD. Life History, Diet, and Reproductive Dynamics of the Sheepshead (Archosargus Probatocephalus) in the Northeastern Gulf of Mexico. [Masters Thesis]. Florida State University; 2017. Available from: http://purl.flvc.org/fsu/fd/FSU_SUMMER2017_Heil_fsu_0071N_14125 ;

Florida State University

23. Ware, Rebecca Lynn. Characterization of Waste-Derived Pyrolysis Oils by Complementary Analysis Techniques.

Degree: PhD, Chemistry and Biochemistry, 2018, Florida State University

URL: http://purl.flvc.org/fsu/fd/2018_Sp_Ware_fsu_0071E_14440 ;

► Pyrolysis oil has shown potential as an environmentally-friendly petroleum replacement for the production of fuel and chemicals. Also, the use of waste materials in the… (more)

▼ Pyrolysis oil has shown potential as an environmentally-friendly petroleum replacement for the production of fuel and chemicals. Also, the use of waste materials in the production of pyrolysis oil alleviates concerns associated with waste disposal. However, there are still challenges in application of pyrolysis oil as fuel and chemicals due to its convoluted composition and properties that make it incompatible with petroleum. Although analyses have been conducted to explore the composition of pyrolysis oils, complete and in-depth characterizations are required for efficient utilization. The work presented here utilizes chromatographic separations and multiple analysis methods to explore the complexity of pyrolysis oils and the differences between samples. The composition of pyrolysis oil is highly dependent on the material used for production. Plant and food materials (biomass) result in oils that are highly oxygenated causing high acidity and viscosity. Pyrolysis of plastic material results in an oil composed of paraffinic hydrocarbons with low oxygen content. When biomass and plastics are mixed in municipal waste, the pyrolysis oil shows a composition with characteristics of both starting components; lower aromaticity than biomass pyrolysis oils and higher oxygen content than plastic pyrolysis oils. Characterization of these different pyrolysis oils requires complementary, targeted analyses for complete coverage of all compositions in each unique sample. The high resolution and mass accuracy of Fourier transform ion cyclotron resonance mass spectrometry provides elemental formulas for the thousands of components within a pyrolysis oil. This method is particularly useful for the polar and high molecular weight species that are not compatible with gas chromatography. In contrast, gas chromatography is beneficial for the analysis of volatile components and provides structural information based on retention time. Infrared spectroscopy provides bulk functional information of an oil, and is especially helpful in identifying oxygen functionalities. To further explore the complexity of pyrolysis oils, solid phase extractions reduce complexity and allow for analysis of targeted chemistries without interference. Extractions also provide functional information based on the interaction of species within the sample with the stationary phase. Combination of methods in the analysis of both biomass- and municipal waste-derived pyrolysis oils provides a molecular level understanding of their compositions and properties, illuminating efficient applications for these oils. p>A Dissertation submitted to the Department of Chemistry and Biochemistry in partial fulfillment of the requirements for the degree of Doctor of Philosophy. p>Spring Semester 2018. p>April 11, 2018. p>Alan G. Marshall, Professor Directing Dissertation; Jeffery P. Chanton, University Representative; Michael Roper, Committee Member; John Dorsey, Committee Member; Geoffrey Strouse, Committee Member.p> Advisors/Committee Members: Alan G. Marshall (professor directing dissertation), Jeffrey P. Chanton (university representative), Michael Gabriel Roper (committee member), John G. Dorsey (committee member), Geoffrey F. Strouse (committee member).

Subjects/Keywords: Chemistry; Analytic

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APA (6^th Edition):

Ware, R. L. (2018). Characterization of Waste-Derived Pyrolysis Oils by Complementary Analysis Techniques. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/2018_Sp_Ware_fsu_0071E_14440 ;

Chicago Manual of Style (16^th Edition):

Ware, Rebecca Lynn. “Characterization of Waste-Derived Pyrolysis Oils by Complementary Analysis Techniques.” 2018. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/2018_Sp_Ware_fsu_0071E_14440 ;.

MLA Handbook (7^th Edition):

Ware, Rebecca Lynn. “Characterization of Waste-Derived Pyrolysis Oils by Complementary Analysis Techniques.” 2018. Web. 10 Apr 2021.

Vancouver:

Ware RL. Characterization of Waste-Derived Pyrolysis Oils by Complementary Analysis Techniques. [Internet] [Doctoral dissertation]. Florida State University; 2018. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/2018_Sp_Ware_fsu_0071E_14440 ;.

Council of Science Editors:

Ware RL. Characterization of Waste-Derived Pyrolysis Oils by Complementary Analysis Techniques. [Doctoral Dissertation]. Florida State University; 2018. Available from: http://purl.flvc.org/fsu/fd/2018_Sp_Ware_fsu_0071E_14440 ;

Florida State University

24. Dimova, Natasha T. Using Radon Isotopes for Studying Hydrological Processes in Marine and Aquatic Systems.

Degree: PhD, Earth, Ocean and Atmospheric Sciences, 2010, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0332 ;

► This study is focused on the application of 222Rn (radon, t1/2=3.8 d) as a geochemical tracer for evaluation groundwater fluxes in different aquatic systems including… (more)

▼ This study is focused on the application of 222Rn (radon, t1/2=3.8 d) as a geochemical tracer for evaluation groundwater fluxes in different aquatic systems including submarine springs and lakes. For this purpose improvements of some established methods for detection of 222Rn in natural waters and investigating the possibilities of concurrent measurements of 220Rn (thoron, t1/2=56 s) for detection of groundwater point sources were developed. The 222Rn groundwater tracer technique was applied at study sites in Spring Creek Springs system (Florida Panhandle) and several small lakes in central Florida. The fresh water groundwater fluxes of Spring Creek Springs were evaluating using salinity and 222Rn as geochemical tracers. Two different approaches were applied. The first model is based on time series measurements of either of the tracers (salinity or 222Rn) and data for stream velocity recorded downstream in the spring area. To verify the first approach we developed a simple two-box model that is independent of stream-point measurements and use concurrent salinity data from both upstream and the spring area. Our results from almost two year of monthly based deployments at the study site indicate that the dynamics of the springs' flow is governed most probably by fluctuations of the local water table. The total spring discharge fluctuated between zero to up to ~3.0x106 m3/day (March 2008). The 222Rn approach for assessing groundwater discharge was tested in seven relatively small lakes in North and Central Florida (Lake Newnans, Lake Butler, Clear Lake, Lake Haines, Lake Shipp, Lake Hunter, and Lake Josephine). A mass balance advection-diffusion model a well mixed non-stratified water body showed to be adequate for evaluating the groundwater fluxes in these systems. Comparison of the estimates of some of the lakes with independent seepage meters and water balance studies showed very good agreement. A special investigation on the groundwater end-member for the model evaluations resulted in a decision of using a sediment equilibration approach for determining this parameter. Finally, we used 222Rn-time-series to asses the groundwater discharge in small shallow lakes. We monitored the 222Rn concentration in lake water over time for a period long enough (usually 1-3 days) to observe changes likely caused by variations in atmospheric exchange (primarily a function of wind speed and temperature). We then attempted to reproduce the observed record by accounting for decay and atmospheric losses and by estimating the total 222Rn input flux using an iterative approach. Once a quasi steady-state 222Rn flux was evaluated by balancing the calculated outputs, we divided this flux by the measured or assumed groundwater radon concentration to determine the groundwater discharge p>A Dissertation submitted to the Department of Oceanography in partial fulfillment of the requirements for the degree of Doctor of Philosophy. p>Spring Semester, 2010. p>December 2, 2009. p>Aquatic Systems, Hydrological Processes, Radon…p> Advisors/Committee Members: William C. Burnett (professor directing dissertation), Xialong Hu (university representative), Jeffrey P. Chanton (committee member), William M. Landing (committee member), Michael Wetz (committee member).

Subjects/Keywords: Oceanography; Atmospheric sciences; Meteorology

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APA (6^th Edition):

Dimova, N. T. (2010). Using Radon Isotopes for Studying Hydrological Processes in Marine and Aquatic Systems. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-0332 ;

Chicago Manual of Style (16^th Edition):

Dimova, Natasha T. “Using Radon Isotopes for Studying Hydrological Processes in Marine and Aquatic Systems.” 2010. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-0332 ;.

MLA Handbook (7^th Edition):

Dimova, Natasha T. “Using Radon Isotopes for Studying Hydrological Processes in Marine and Aquatic Systems.” 2010. Web. 10 Apr 2021.

Vancouver:

Dimova NT. Using Radon Isotopes for Studying Hydrological Processes in Marine and Aquatic Systems. [Internet] [Doctoral dissertation]. Florida State University; 2010. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0332 ;.

Council of Science Editors:

Dimova NT. Using Radon Isotopes for Studying Hydrological Processes in Marine and Aquatic Systems. [Doctoral Dissertation]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0332 ;

Florida State University

25. Johansen, Caroline Van Limbeek. Dynamics of Natural Hydrocarbon Seeps in the Northern Gulf of Mexico.

Degree: PhD, Earth, Ocean, and Atmospheric Science, 2016, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_2016SU_Johansen_fsu_0071E_13329 ;

► Since the discovery of the Gulf of Mexico, it has become an area of extensive exploration. The Gulf of Mexico harbors specific commodities that are… (more)

▼ Since the discovery of the Gulf of Mexico, it has become an area of extensive exploration. The Gulf of Mexico harbors specific commodities that are essential in our modern economy. Oil companies provided money and technology to find and study locations for oil exploitation. With the onset of seismic data acquisition, it was possible to gain a more comprehensive understanding of the formation and structure of this unique basin that is in constant dynamic disequilibrium, and facilitates hydrocarbon leakage. The natural seepage of oil and gas to the sea floor is of interest because these “leaks” expel methane which is potentially a significant factor in the global Carbon cycle. Determining the migration pathways through the sedimentary strata to the various primary conduits at the sea floor provides a comprehensive understanding of the large scale dynamic “plumbing system” in the Gulf of Mexico. One of the objectives in this research was to quantify the rate and volume of oil and gas released from two natural seeps in lease blocks GC600 (1200 m depth) and MC118 (850 m depth). Our purpose was to determine variability in bubble size and release rates at three individual vents and to estimate how changes in pressure affect bubble release rates. Observations with autonomous video cameras (VTLC) captured the formation of individual bubbles as they were released through gas hydrate outcrops. Image processing techniques determined bubble type (oily, gaseous, and mixed: oily and gaseous), size distribution, release rate, and temporal variations (observation intervals from 3 h to 26 d). One vent at GC600 (Birthday Candles) released oily bubbles with an average diameter of 5.0 mm (std. 1.30) at a rate of 4.37 bubbles s⁻¹. A second vent at GC600 (Mega Plume) released mixed oil and gas bubbles with an average diameter of 3.9 mm (std. 1.19) at a rate of 103 bubbles s⁻¹ (std. 24.6). A third vent at MC118 (Rudyville) released gaseous bubbles with an average diameter of 3.0 mm (std. 1.99) at a rate of 127 bubbles s⁻¹ (std. 34.1). To quantify bubble release, a robust image processing technique was developed that is adaptable to the various environments found in deep-sea oil and gas vents. Our second objective was to constrain the migration of hydrocarbons from the source rock to the sea floor. A compilation of data sets from the macro to micro scale were used to describe the overall sequence of hydrocarbon migration and discharge from ~15 kmbsf to the water column. Geochemical similarities were found by fingerprinting oil samples from reservoir, active vents and sea-surface to show migration connectivity from source to seafloor. To support the geochemical data, measurements of fluxes and the magnitude of fluid flow indicators (e.g. bacteria mats, hydrate mounds, etc.) were compiled, and we have attempted to categorize and quantify the various processes that sequester hydrocarbons. Different stages of upward hydrocarbon flow were characterized by visual and morphological tracers. Varying reflectivity values in seismic and subbottom… Advisors/Committee Members: Ian R. (Ian Rosman) MacDonald (professor directing dissertation), Tarek Abichou (university representative), William K. Dewar (committee member), Jeffrey P. Chanton (committee member), Michael Abrams (committee member).

Subjects/Keywords: Environmental sciences

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APA (6^th Edition):

Johansen, C. V. L. (2016). Dynamics of Natural Hydrocarbon Seeps in the Northern Gulf of Mexico. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2016SU_Johansen_fsu_0071E_13329 ;

Chicago Manual of Style (16^th Edition):

Johansen, Caroline Van Limbeek. “Dynamics of Natural Hydrocarbon Seeps in the Northern Gulf of Mexico.” 2016. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_2016SU_Johansen_fsu_0071E_13329 ;.

MLA Handbook (7^th Edition):

Johansen, Caroline Van Limbeek. “Dynamics of Natural Hydrocarbon Seeps in the Northern Gulf of Mexico.” 2016. Web. 10 Apr 2021.

Vancouver:

Johansen CVL. Dynamics of Natural Hydrocarbon Seeps in the Northern Gulf of Mexico. [Internet] [Doctoral dissertation]. Florida State University; 2016. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SU_Johansen_fsu_0071E_13329 ;.

Council of Science Editors:

Johansen CVL. Dynamics of Natural Hydrocarbon Seeps in the Northern Gulf of Mexico. [Doctoral Dissertation]. Florida State University; 2016. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SU_Johansen_fsu_0071E_13329 ;

Florida State University

26. Jasrotia, Puja. Denitrification in the Uranium and Nitrate-Contaminated Terrestrial Subsurface.

Degree: PhD, Earth, Ocean, and Atmospheric Science, 2016, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_2016SP_Jasrotia_fsu_0071E_12379 ;

► Nitrate (NO3-) and uranium (U) are priority co-contaminants at U.S. Department of Energy (DOE) managed nuclear legacy waste sites, where nitric acid was extensively used… (more)

▼ Nitrate (NO3-) and uranium (U) are priority co-contaminants at U.S. Department of Energy (DOE) managed nuclear legacy waste sites, where nitric acid was extensively used to process uranium waste. This combination of a low pH and mixed metal contamination in a subsurface environment is also representative of legacy nuclear waste sites worldwide. The subsurface at DOE's Oak Ridge Integrated Field Scale Research Challenge (OR-IFRC) site is heavily contaminated with NO3-, radionuclides, heavy metals, and halogenated organics. NO3- concentrations in the near source zone (adjacent to the former S-3 ponds) reaches extraordinarily high concentrations (in the range of 10-1000 mM). Extensive research and field scale experiments have focused on ways of removing nitrate and recognize microbially-mediated denitrification as the most significant process in bioremediation and natural attenuation strategies. However, high levels of contamination decreases diversity of cultivable and non-cultivable bacterial populations in OR-IFRC groundwater, and low pH can inhibit denitrification activity. Denitrification is a microbially mediated dissimilatory reduction of nitrate to produce gaseous end products (N2O, N2). Denitrification is mediated by a group of facultative anaerobes including bacteria, fungi and archaea which display a wide range in phylogenetic affiliation and metabolic capabilities. Though nitrate respiring microorganisms have been studied extensively in soils and aquatic environments, the mechanisms controlling in situ metabolism of NO3- reduction remain poorly understood in terrestrial aquifers. The relationships between environmental factors (e.g. geochemistry, contaminant, pH), denitrifying community composition, and denitrification rates are intertwined and complex. Hence, the main objective of this dissertation was characterization of the microbial community mediating denitrification and understand their mechanisms and controls in a radionuclide contaminated terrestrial subsurface. The objectives of Chapter 1 were to extensively characterize microbial diversity and composition in acidic to circumneutral subsurface groundwater samples (pH 3.1-7.1) using a polyphasic approach. Multivariate analyses with geochemical and contaminant variables, and microbial community indices, showed the groundwater pH had the strongest effect of any variable on these communities. Our pyrosequencing survey of microbial diversity across the watershed has provided an initial insight into the large-scale distribution patterns of microbes in this unique environment, with greater variability in physical and geochemical attributes. The community was strongly dominated (>80%) by Proteobacteria, most of which fell into the Gamma-, Beta- and Alpha-Proteobacteria, and community composition was driven … Advisors/Committee Members: Jeffrey P. Chanton (professor directing dissertation), Christopher Coutts (university representative), Markus Huettel (committee member), Amy R. (Amy Rose) Baco-Taylor (committee member), Christopher W. Schadt (committee member), Stefan J. Green (committee member), Joel E. Kostka (committee member).

Subjects/Keywords: Marine biology; Biogeochemistry; Molecular biology

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APA (6^th Edition):

Jasrotia, P. (2016). Denitrification in the Uranium and Nitrate-Contaminated Terrestrial Subsurface. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2016SP_Jasrotia_fsu_0071E_12379 ;

Chicago Manual of Style (16^th Edition):

Jasrotia, Puja. “Denitrification in the Uranium and Nitrate-Contaminated Terrestrial Subsurface.” 2016. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_2016SP_Jasrotia_fsu_0071E_12379 ;.

MLA Handbook (7^th Edition):

Jasrotia, Puja. “Denitrification in the Uranium and Nitrate-Contaminated Terrestrial Subsurface.” 2016. Web. 10 Apr 2021.

Vancouver:

Jasrotia P. Denitrification in the Uranium and Nitrate-Contaminated Terrestrial Subsurface. [Internet] [Doctoral dissertation]. Florida State University; 2016. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SP_Jasrotia_fsu_0071E_12379 ;.

Council of Science Editors:

Jasrotia P. Denitrification in the Uranium and Nitrate-Contaminated Terrestrial Subsurface. [Doctoral Dissertation]. Florida State University; 2016. Available from: http://purl.flvc.org/fsu/fd/FSU_2016SP_Jasrotia_fsu_0071E_12379 ;

Florida State University

27. Stringer, Christina Elaine. Assessment of Groundwater Discharge to Lake Barco via Radon Tracing.

Degree: MS, Earth, Ocean and Atmospheric Sciences, 2004, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0395 ;

► Groundwater-surface water interactions in lakes have been gaining attention in recent years as scientists have recognized the potential significance that groundwater has as a source… (more)

▼ Groundwater-surface water interactions in lakes have been gaining attention in recent years as scientists have recognized the potential significance that groundwater has as a source of nutrients and contaminants to aquatic ecosystems. Such interactions need to be understood in order for us to protect important ecosystems and quantify nutrient loading into lakes. This project set out to test the idea that good estimates could be made of groundwater inputs into Florida lakes using a simple geochemical tracer technique. We hypothesize that a relatively small number of measurements would be sufficient to provide a reasonably good (a factor of 2) estimate of groundwater discharge. Naturally occurring 222Rn makes an ideal tracer because it exists in enriched concentrations in groundwater relative to surface water. We used Lake Barco, a small seepage lake in the Katherine Ordway Preserve, for a detailed pilot study in order to test this hypothesis. The preserve is located about 34 km east of Gainesville, Florida and makes an excellent research site because it is maintained in a pristine state as it is closed off to public access. Two intensive samplings were completed, one in the "dry" season (March 2002) and one in the "wet" season (August 2003). In addition, periodic sampling trips were made to the lake every few weeks to evaluate the spatial and temporal patterns of radon distribution. A 222Rn mass balance was constructed for the lake to evaluate radon fluxes. Once the 222Rn fluxes were determined, groundwater inputs were estimated by dividing these fluxes by the concentration of radon in the water seeping into the lake. The radon concentration is estimated by sediment equilibration experiments using grab samples of sediment and radon activity measurements from monitor wells. We also constructed a traditional hydrologic water budget for Lake Barco. All hydrological variables were either measured or estimated and substituted into a water balance equation, which was then solved for the net groundwater flow term. These estimates were then compared to those from the 222Rn model. Our 222Rn measurements show little discernible spatial variation of radon inventories in the lake on any given day of sampling. Inventories measured at five different stations during the two different intensive sampling trips were all within ±13% of the mean value for each sampling. This amount of variation is considered insignificant, as the estimated analytical variation for the radon measurements is ±10%. We also found that we can estimate the lake inventory at any one station by collecting triplicate samples approximately one meter over the bottom at a single central sampling station. However, our results did display significant temporal variability, responding to rainfall trends that can influence the recharge rates. So, in a lake the size of Lake Barco (12 ha), reasonable groundwater discharge estimates at any given time can be made by triplicate analysis of radon in near-bottom waters and collection and processing of a few sediment samples.… Advisors/Committee Members: William C. Burnett (professor directing thesis), Jeffrey P. Chanton (committee member), Wilton Sturges (committee member).

Subjects/Keywords: Oceanography; Atmospheric sciences; Meteorology

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APA (6^th Edition):

Stringer, C. E. (2004). Assessment of Groundwater Discharge to Lake Barco via Radon Tracing. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-0395 ;

Chicago Manual of Style (16^th Edition):

Stringer, Christina Elaine. “Assessment of Groundwater Discharge to Lake Barco via Radon Tracing.” 2004. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-0395 ;.

MLA Handbook (7^th Edition):

Stringer, Christina Elaine. “Assessment of Groundwater Discharge to Lake Barco via Radon Tracing.” 2004. Web. 10 Apr 2021.

Vancouver:

Stringer CE. Assessment of Groundwater Discharge to Lake Barco via Radon Tracing. [Internet] [Masters thesis]. Florida State University; 2004. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0395 ;.

Council of Science Editors:

Stringer CE. Assessment of Groundwater Discharge to Lake Barco via Radon Tracing. [Masters Thesis]. Florida State University; 2004. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0395 ;

Florida State University

28. Fields, Dana L. Stable Isotope Studies of Methane Production in Northern Wetlands.

Degree: MS, Earth, Ocean and Atmospheric Sciences, 2004, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4466 ;

► Northern peatlands are complex wetland ecosystems that are characterized as bogs, fens, or tundra. Since these systems are flooded for much of the growing season,… (more)

▼ Northern peatlands are complex wetland ecosystems that are characterized as bogs, fens, or tundra. Since these systems are flooded for much of the growing season, organic matter often decomposes anaerobically. Methanogenesis is the dominant means of anaerobic metabolism occurring in these wetlands and can occur via two separate pathways. Acetoclastic methanogenesis involves the formation and subsequent degradation of acetate to form carbon dioxide and methane. Methane can also be produced by the reduction of carbon dioxide by hydrogen gas. This research uses natural abundance isotopes to discern the proportion of methane produced by each of these mechanisms in peatlands along a north-south transect across Alaska. The focus of this research was to investigate pathway shifts in methane production across latitudinal and vegetation gradients in order to discover if acetoclastice methanogenesis becomes less important at higher latitudes. Our study concluded that factors other than latitude (vegetation type and/or pH) have greater impact on methane production mechanism than does latitude. Another objective of this research was to determine if the methanogenic pathway influences the stable deuterium (äD) isotope ratios of the methane produced. This study provided further evidence that methane production mechanism influences the äD of methane causing an antipathetic relationship between the fractionation factors of D and 13C (áD and áC). p>A Thesis submitted to the Department of Oceanography in partial fulfillment of the requirements for the degree of >Master of Science. p>Summer Semester, 2004. p>September 19, 2003. p>Methane Production, Natural Abundance Isotopes, Methane, Stable Isotopes, Alpha, Fractionation Factors p>Jeffrey P. Chanton, Professor Directing Thesis; Joel Kostka, Committee Member; William M. Landing, Committee Member.p> Advisors/Committee Members: Jeffrey P. Chanton (professor directing thesis), Joel Kostka (committee member), William M. Landing (committee member).

Subjects/Keywords: Oceanography

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APA (6^th Edition):

Fields, D. L. (2004). Stable Isotope Studies of Methane Production in Northern Wetlands. (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-4466 ;

Chicago Manual of Style (16^th Edition):

Fields, Dana L. “Stable Isotope Studies of Methane Production in Northern Wetlands.” 2004. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-4466 ;.

MLA Handbook (7^th Edition):

Fields, Dana L. “Stable Isotope Studies of Methane Production in Northern Wetlands.” 2004. Web. 10 Apr 2021.

Vancouver:

Fields DL. Stable Isotope Studies of Methane Production in Northern Wetlands. [Internet] [Masters thesis]. Florida State University; 2004. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4466 ;.

Council of Science Editors:

Fields DL. Stable Isotope Studies of Methane Production in Northern Wetlands. [Masters Thesis]. Florida State University; 2004. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4466 ;

Florida State University

29. D'Andrilli, Juliana. Molecular Characterization of Marine and Terrestrial Dissolved Organic Matter Using Ultrahigh Resolution Mass Spectrometry.

Degree: PhD, Chemistry and Biochemistry, 2009, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0861 ;

► Various analytical techniques have been employed to probe the chemical identity and characteristics of complex Dissolved Organic Matter (DOM) mixtures. With continuing advances in readily… (more)

▼ Various analytical techniques have been employed to probe the chemical identity and characteristics of complex Dissolved Organic Matter (DOM) mixtures. With continuing advances in readily available highly developed mass spectrometers, the amount of information generated for analysis is steadily rising. Currently, Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR-MS) at high magnetic field (> 9 Tesla), is the only advanced analytical technique capable of ultrahigh resolution and mass accuracy that can distinguish upwards of 10,000 spectral peaks. This technique facilitates the identification of thousands of unambiguous molecular formulae for complex DOM. The most commonly used ionization method, Electrospray Ionization (ESI), has proven to be an excellent source for DOM ionization prior to MS analysis. ESI coupled to FT-ICR-MS provides an ideal combination necessary for investigating and characterizing DOM from unique natural environments. 9 Tesla), is the only advanced analytical technique capable of ultrahigh resolution and mass accuracy that can distinguish upwards of 10,000 spectral peaks. This technique facilitates the identification of thousands of unambiguous molecular formulae for complex DOM. The most commonly used ionization method, Electrospray Ionization (ESI), has proven to be an excellent source for DOM ionization prior to MS analysis. ESI coupled to FT-ICR-MS provides an ideal combination necessary for investigating and characterizing DOM from unique natural environments. DOM represents the largest reservoir of organic carbon stored in the oceans. Its source has been proposed to originate from marine primary and bacterial production, with limited land-derived contributors. Marine DOM is a complex mixture of biomolecules that either exist naturally or have been transformed from living and decaying organisms in the ocean. Previous research has identified only a small portion of deep sea DOM, due to the complexity of the mixture and lack of advanced techniques available; however, ultrahigh resolution mass spectrometry has succeeded for DOM characterization where other techniques have failed. In Chapter 3, we compare ultrahigh resolution mass spectra of marine DOM isolated from two sites in the Weddell Sea (Antarctica) using ESI and Atmospheric Pressure Photoionization (APPI). These spectra, obtained on a 9.4 Tesla FT-ICR-MS, indicate the two ionization techniques are complementary. Ions produced by APPI extend to higher carbon undersaturation compared to ESI, indicated by higher double-bond equivalence minus oxygen (DBE-O) values, while ions in the ESI spectra are more oxygenated. Moreover, many sulfur-containing compounds were efficiently ionized by ESI but not detected by APPI. These results show that the differences in mass spectra obtained by ESI and APPI FT-ICR-MS are significant and that both are necessary to obtain a complete description of the molecular composition of marine DOM. Peatlands are extraordinary carbon reservoirs due to their sequestration and emission of greenhouse… Advisors/Committee Members: William T. Cooper III (professor directing dissertation), Jeffrey P. Chanton (outside committee member), Robert L. Fulton (committee member), Naresh Dalal (committee member).

Subjects/Keywords: Chemistry

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APA (6^th Edition):

D'Andrilli, J. (2009). Molecular Characterization of Marine and Terrestrial Dissolved Organic Matter Using Ultrahigh Resolution Mass Spectrometry. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-0861 ;

Chicago Manual of Style (16^th Edition):

D'Andrilli, Juliana. “Molecular Characterization of Marine and Terrestrial Dissolved Organic Matter Using Ultrahigh Resolution Mass Spectrometry.” 2009. Doctoral Dissertation, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-0861 ;.

MLA Handbook (7^th Edition):

D'Andrilli, Juliana. “Molecular Characterization of Marine and Terrestrial Dissolved Organic Matter Using Ultrahigh Resolution Mass Spectrometry.” 2009. Web. 10 Apr 2021.

Vancouver:

D'Andrilli J. Molecular Characterization of Marine and Terrestrial Dissolved Organic Matter Using Ultrahigh Resolution Mass Spectrometry. [Internet] [Doctoral dissertation]. Florida State University; 2009. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0861 ;.

Council of Science Editors:

D'Andrilli J. Molecular Characterization of Marine and Terrestrial Dissolved Organic Matter Using Ultrahigh Resolution Mass Spectrometry. [Doctoral Dissertation]. Florida State University; 2009. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-0861 ;

Florida State University

30. Hanson, Chad W. The Influence of Diet on Stable Carbon Isotope Composition in Otoliths of Juvenile Red Drum (Sciaenops Ocellatus).

Degree: MS, Earth, Ocean and Atmospheric Sciences, 2004, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4281 ;

► To evaluate the influence of dietary carbon on fish otoliths, juvenile red drum (Sciaenops ocellatus) were raised for 6 and 9 months in tanks with… (more)

Subjects/Keywords: Oceanography; Oceanography; Atmospheric sciences; Meteorology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hanson, C. W. (2004). The Influence of Diet on Stable Carbon Isotope Composition in Otoliths of Juvenile Red Drum (Sciaenops Ocellatus). (Masters Thesis). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-4281 ;

Chicago Manual of Style (16^th Edition):

Hanson, Chad W. “The Influence of Diet on Stable Carbon Isotope Composition in Otoliths of Juvenile Red Drum (Sciaenops Ocellatus).” 2004. Masters Thesis, Florida State University. Accessed April 10, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-4281 ;.

MLA Handbook (7^th Edition):

Hanson, Chad W. “The Influence of Diet on Stable Carbon Isotope Composition in Otoliths of Juvenile Red Drum (Sciaenops Ocellatus).” 2004. Web. 10 Apr 2021.

Vancouver:

Hanson CW. The Influence of Diet on Stable Carbon Isotope Composition in Otoliths of Juvenile Red Drum (Sciaenops Ocellatus). [Internet] [Masters thesis]. Florida State University; 2004. [cited 2021 Apr 10]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4281 ;.

Council of Science Editors:

Hanson CW. The Influence of Diet on Stable Carbon Isotope Composition in Otoliths of Juvenile Red Drum (Sciaenops Ocellatus). [Masters Thesis]. Florida State University; 2004. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-4281 ;

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