subject:(Primary production)

1. Ou, Chouly. Floodplain River Foodwebs in the Lower Mekong Basin.

Degree: 2013, Texas Digital Library

URL: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66669

► The Mekong River is one of the world???s most important rivers in terms of its size, economic importance, cultural significance, productivity, and biodiversity. The Mekong… (more)

▼ The Mekong River is one of the world???s most important rivers in terms of its size, economic importance, cultural significance, productivity, and biodiversity. The Mekong River???s fisheries and biodiversity are threatened by major hydropower development and over-exploitation. Knowledge of river food web ecology is essential for management of the impacts created by anthropogenic activities on plant and animal populations and ecosystems. In the present study, I surveyed four tropical rivers in Cambodia within the Mekong River Basin. I examined the basal production sources supporting fish biomass in the four rivers during the dry and wet seasons and explored the relationship between trophic position and body size of fish at various taxonomic levels, among local species assemblages, and across trophic guilds. I used stable isotopes of carbon and nitrogen to estimate fish trophic levels and the principal primary production sources supporting fishes. My study provides evidence that food web dynamics in tropical rivers undergo significant seasonal shifts and emphasizes that river food webs are altered by dams and flow regulation. Seston and benthic algae were the most important production sources supporting fish biomass during the dry season, and riparian macrophytes appeared to be the most important production source supporting fishes during the wet season. In the river with strong flow regulation from an upstream impoundment, seston and benthic algae were even more important production sources supporting fishes during the dry season. My findings challenge the Eltonian theory of size-based trophic structure in food webs and also contradict the broadly accepted prediction of the fishing-down-the-food-web concept. Eltonian and fishing-down-the-food-web concepts propose that trophic level is strongly correlated with body size, but I found no significant correlation between body size and trophic position for fish assemblages. Results suggest that body size distributions are not useful for prediction the trophic structure of communities with diverse detritivores, omnivores and insectivores, but that it is a good predictor of trophic position among piscivorous fishes. Advisors/Committee Members: Winemiller, Kirk O (advisor).

Subjects/Keywords: Primary production sources

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APA (6^th Edition):

Ou, C. (2013). Floodplain River Foodwebs in the Lower Mekong Basin. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66669

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ou, Chouly. “Floodplain River Foodwebs in the Lower Mekong Basin.” 2013. Thesis, Texas Digital Library. Accessed January 17, 2021. http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66669.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ou, Chouly. “Floodplain River Foodwebs in the Lower Mekong Basin.” 2013. Web. 17 Jan 2021.

Vancouver:

Ou C. Floodplain River Foodwebs in the Lower Mekong Basin. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66669.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ou C. Floodplain River Foodwebs in the Lower Mekong Basin. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66669

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Victoria

2. Marshall, Lucianne M. Progression of marine phytoplankton blooms and environmental dynamics from sea-ice coverage to open waters in the coastal Arctic: comparing experimental data with continuous cabled observations.

Degree: Department of Biology, 2018, University of Victoria

URL: https://dspace.library.uvic.ca//handle/1828/10131

► In this thesis, I present a unique temporal study of phytoplankton, nutrient and environmental dynamics that focussed on the transitional period between sea-ice cover conditions… (more)

▼ In this thesis, I present a unique temporal study of phytoplankton, nutrient and environmental dynamics that focussed on the transitional period between sea-ice cover conditions and open waters in a coastal inlet of the Canadian Arctic during 2016. I also compared the 2016 experimental data with continuous observations made by the Ocean Networks Canada (ONC) underwater observatory. Surface seawater sampling was conducted in Cambridge Bay with high temporal resolution from June 16 to August 3, to measure phytoplankton carbon and nitrate utilisation, silica production, phytoplankton biomass, phytoplankton taxonomy and dissolved nutrients. Throughout the study period, nitrate concentrations averaged 0.67  0.08 µmol L-1, and chlorophyll a and primary production were low at 0.11  0.005 µg L-1 and 0.25  0.02 µmol C L-1 d-1, respectively. The presence of sea-ice reduced physical mixing, which resulted in low surface nitrate concentrations. Phytoplankton assemblages, production rates and biomass were dominated by small flagellated cells (<5 µm) until late July, yet increases in temperature and nitrate later in the season enabled larger Chaetoceros spp. diatoms to bloom. The Chaetoceros bloom coincided with a peak in silica production (0.429 µmol Si L-1 d-1), which was otherwise low, but variable. The time series was divided into three phases based on changes in environmental conditions, these phases were used to evaluate changes in biological dynamics. Phase I was characterised by sea-ice, low nitrate and increasing phytoplankton biomass and primary production. Phase II was a transitional period, with calm water conditions a drop in phytoplankton biomass, however, an increase in the mean nitrate concentration enabled more consistent carbon fixation. PIII had greater environmental variability driven by mixing events. The mixing of the water column in PIII enabled larger Chaetoceors spp. to become prevalent in the surface waters contributing increasingly to the biomass and carbon utilisation. Overall, the nutrient concentrations, levels of biomass and production rates in Cambridge Bay were more reflective of those from oligotrophic regions. When comparing experimental data with observations made by the ONC observatory, a strong relationship between carbon utilisation and apparent oxygen utilisation became evident. This finding suggests that long-term in situ observations can potentially be used to monitor biological rates in the Arctic. The temporal resolution of this field study adds a seasonal perspective to our understanding of Arctic ecosystems, complements studies with greater spatial and interannual coverage, and can contribute to future numerical modelling of Arctic change. Furthermore, this study provides a first-time comparison between experimentally-measured phytoplankton production and cabled observations in the Arctic. Advisors/Committee Members: Varela, Diana Esther (supervisor).

Subjects/Keywords: Phytoplankton; Arctic; Primary production; Biology

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APA (6^th Edition):

Marshall, L. M. (2018). Progression of marine phytoplankton blooms and environmental dynamics from sea-ice coverage to open waters in the coastal Arctic: comparing experimental data with continuous cabled observations. (Masters Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/10131

Chicago Manual of Style (16^th Edition):

Marshall, Lucianne M. “Progression of marine phytoplankton blooms and environmental dynamics from sea-ice coverage to open waters in the coastal Arctic: comparing experimental data with continuous cabled observations.” 2018. Masters Thesis, University of Victoria. Accessed January 17, 2021. https://dspace.library.uvic.ca//handle/1828/10131.

MLA Handbook (7^th Edition):

Marshall, Lucianne M. “Progression of marine phytoplankton blooms and environmental dynamics from sea-ice coverage to open waters in the coastal Arctic: comparing experimental data with continuous cabled observations.” 2018. Web. 17 Jan 2021.

Vancouver:

Marshall LM. Progression of marine phytoplankton blooms and environmental dynamics from sea-ice coverage to open waters in the coastal Arctic: comparing experimental data with continuous cabled observations. [Internet] [Masters thesis]. University of Victoria; 2018. [cited 2021 Jan 17]. Available from: https://dspace.library.uvic.ca//handle/1828/10131.

Council of Science Editors:

Marshall LM. Progression of marine phytoplankton blooms and environmental dynamics from sea-ice coverage to open waters in the coastal Arctic: comparing experimental data with continuous cabled observations. [Masters Thesis]. University of Victoria; 2018. Available from: https://dspace.library.uvic.ca//handle/1828/10131

Louisiana State University

3. Pei, Shaofeng. What does the ¹⁴C method for estimating photosynthetic rates in the ocean really measure?.

Degree: PhD, Oceanography and Atmospheric Sciences and Meteorology, 2012, Louisiana State University

URL: etd-08252012-152026 ; https://digitalcommons.lsu.edu/gradschool_dissertations/4036

► The ¹⁴C method has been used extensively by both limnologists and oceanographers to measure photosynthetic rates in aquatic systems, and the large database of ¹⁴C… (more)

▼ The ¹⁴C method has been used extensively by both limnologists and oceanographers to measure photosynthetic rates in aquatic systems, and the large database of ¹⁴C measurements that now exists is the ground truth with which satellite algorithms for estimating marine photosynthetic rates on a basin and global scale have been calibrated. However, disconcerting uncertainties still remain with respect to whether and under what circumstances the ¹⁴C method provides an estimate of net or gross photosynthesis, or something in between. My study combined batch and continuous culture studies to clarify this ambiguous issue. The batch culture work with seven species of marine phytoplankton indicated that the ¹⁴C method should estimate net photosynthesis for Isochrysis galbana and Dunaliella tertiolecta, gross photosynthesis for Chlorella kessleri, and a rate in between for the remaining four species. Follow-up chemostat studies with I. galbana and C. kessleri grown under both light- and nitrate-limited conditions produced results consistent with the implications of the batch culture work. For I. galbana the photosynthetic rates estimated by ¹⁴C uptake were in good agreement with the actual net fixation, but for C. kessleri the ¹⁴C method overestimated TOC fixation by roughly 50–100%, the degree of overestimation depending on incubation length and growth condition. Time-course studies with C. kessleri indicated that at a high nitrate-limited growth rate recently fixed carbon began to enter the respiratory substrate pool after a time interval of about four hours. Results of 12:12 L:D cycle incubations were not as straightforward to interpret as the continuous culture results, but the calculated photosynthetic rates relative to net carbon fixation were clearly a function of species and growth rate. The fact that the specific activity (SA) of organic carbon respired in the dark period was less than the SA of the inorganic carbon in the growth medium implies that carbon respired in the dark was a combination of recently fixed carbon and old carbon. These results imply that in field studies the uptake of ¹⁴C during the photoperiod overestimates net photosynthesis, the degree of overestimation depending on the growth conditions and composition of the phytoplankton community.

Subjects/Keywords: production rate; primary productivity; respiration

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APA (6^th Edition):

Pei, S. (2012). What does the ¹⁴C method for estimating photosynthetic rates in the ocean really measure?. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-08252012-152026 ; https://digitalcommons.lsu.edu/gradschool_dissertations/4036

Chicago Manual of Style (16^th Edition):

Pei, Shaofeng. “What does the ¹⁴C method for estimating photosynthetic rates in the ocean really measure?.” 2012. Doctoral Dissertation, Louisiana State University. Accessed January 17, 2021. etd-08252012-152026 ; https://digitalcommons.lsu.edu/gradschool_dissertations/4036.

MLA Handbook (7^th Edition):

Pei, Shaofeng. “What does the ¹⁴C method for estimating photosynthetic rates in the ocean really measure?.” 2012. Web. 17 Jan 2021.

Vancouver:

Pei S. What does the ¹⁴C method for estimating photosynthetic rates in the ocean really measure?. [Internet] [Doctoral dissertation]. Louisiana State University; 2012. [cited 2021 Jan 17]. Available from: etd-08252012-152026 ; https://digitalcommons.lsu.edu/gradschool_dissertations/4036.

Council of Science Editors:

Pei S. What does the ¹⁴C method for estimating photosynthetic rates in the ocean really measure?. [Doctoral Dissertation]. Louisiana State University; 2012. Available from: etd-08252012-152026 ; https://digitalcommons.lsu.edu/gradschool_dissertations/4036

University of Alberta

4. Jahan, Nasreen. Modeling carbon-water-vegetation dynamics using remote sensing and climate data.

Degree: PhD, Department of Civil and Environmental Engineering, 2011, University of Alberta

URL: https://era.library.ualberta.ca/files/hh63sv96j

► Carbon and water fluxes are essential components of biospheric processes which directly or indirectly influence climate, surface energy balance, hydrologic processes and hence influence the… (more)

▼ Carbon and water fluxes are essential components of biospheric processes which directly or indirectly influence climate, surface energy balance, hydrologic processes and hence influence the vegetation productivity, distribution and characteristics. In this research, promising techniques for simulating carbon (Gross primary production) and water fluxes (soil moisture and evapotranspiration) were developed using remotely sensed data to overcome our dependence on meteorological data which are often not available with sufficient accuracy for regional scale climate studies. The temporal responses of vegetation to climate were assessed using Artificial Neural Network (ANN) and two remotely sensed vegetation indices (VIs), normalized difference vegetation index (NDVI) and enhanced vegetation index (EVI). The results demonstrated a promising potential for monitoring the patterns of terrestrial vegetation productivity from VIs and climate variables in a boreal mixedwood forest of western Canada. Next, the potential of using the newly available, quad-polarized, RADARSAT-2 synthetic Aperture Radar (SAR) data in retrieving near surface soil moisture in the Canadian Prairies was examined. Ten Radarsat-2 images have been acquired over the Paddle River Basin (PRB), Alberta, Canada and 2250 soil samples have been collected from 9 different sites within the same basin on those 10 days. Soil moisture was retrieved using the regressions, theoretical Integral Equation model (IEM) and two machine learning techniques: ANN and Support Vector Machine. The results show that combined radar and optical satellite data from the Moderate Resolution Imaging Spectroradiometer (MODIS) can be used to retrieve near surface soil moisture accurately. Finally, algorithms were developed to model vegetation carbon flux (Gross Primary Production, GPP) and evapotranspiration (ET) for the coniferous and deciduous forests using solely remote sensing data from MODIS. The remotely sensed GPP (R-GPP) and ET model (R-ET) were parameterized and validated using the observed data derived from the eddy covariance towers located in north-eastern USA. The proposed models attempt to exclude the use of ground data or climate data as model input by utilizing MODIS ecosystem and radiation budget variables. Considering the trade-off between sophisticated modeling approach and the uncertainties in obtaining regional scale reliable climate data, it can be concluded that these simple models (R-GPP and R-ET) are practical and promising in providing valuable inputs for regional scale hydrological modeling and water resource planning and managements.

Subjects/Keywords: Remote Sensing; Evapotranspiration; Gross Primary Production

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APA (6^th Edition):

Jahan, N. (2011). Modeling carbon-water-vegetation dynamics using remote sensing and climate data. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/hh63sv96j

Chicago Manual of Style (16^th Edition):

Jahan, Nasreen. “Modeling carbon-water-vegetation dynamics using remote sensing and climate data.” 2011. Doctoral Dissertation, University of Alberta. Accessed January 17, 2021. https://era.library.ualberta.ca/files/hh63sv96j.

MLA Handbook (7^th Edition):

Jahan, Nasreen. “Modeling carbon-water-vegetation dynamics using remote sensing and climate data.” 2011. Web. 17 Jan 2021.

Vancouver:

Jahan N. Modeling carbon-water-vegetation dynamics using remote sensing and climate data. [Internet] [Doctoral dissertation]. University of Alberta; 2011. [cited 2021 Jan 17]. Available from: https://era.library.ualberta.ca/files/hh63sv96j.

Council of Science Editors:

Jahan N. Modeling carbon-water-vegetation dynamics using remote sensing and climate data. [Doctoral Dissertation]. University of Alberta; 2011. Available from: https://era.library.ualberta.ca/files/hh63sv96j

Virginia Tech

5. Hart, Adam Michael. Seasonal Variation in Whole Stream Metabolism across Varying Land Use Types.

Degree: MS, Biological Sciences, 2013, Virginia Tech

URL: http://hdl.handle.net/10919/23256

► Historically, whole stream open channel metabolism has been measured over short periods in conjunction with nutrient injections to assess nutrient dynamics within streams. The purpose… (more)

Subjects/Keywords: metabolism; gross primary production; respiration; streams; exurbanization

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

APA (6^th Edition):

Hart, A. M. (2013). Seasonal Variation in Whole Stream Metabolism across Varying Land Use Types. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/23256

Chicago Manual of Style (16^th Edition):

Hart, Adam Michael. “Seasonal Variation in Whole Stream Metabolism across Varying Land Use Types.” 2013. Masters Thesis, Virginia Tech. Accessed January 17, 2021. http://hdl.handle.net/10919/23256.

MLA Handbook (7^th Edition):

Hart, Adam Michael. “Seasonal Variation in Whole Stream Metabolism across Varying Land Use Types.” 2013. Web. 17 Jan 2021.

Vancouver:

Hart AM. Seasonal Variation in Whole Stream Metabolism across Varying Land Use Types. [Internet] [Masters thesis]. Virginia Tech; 2013. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10919/23256.

Council of Science Editors:

Hart AM. Seasonal Variation in Whole Stream Metabolism across Varying Land Use Types. [Masters Thesis]. Virginia Tech; 2013. Available from: http://hdl.handle.net/10919/23256

6. Mejica, Brooke N. Terrestrial-Aquatic Linkages: Watershed (Geologic and Vegetation) Runoff Influences on Primary Production of a Sub Alpine Lake.

Degree: 2014, University of Nevada – Reno

URL: http://hdl.handle.net/11714/2984

► Nutrient transfer via runoff from terrestrial to aquatic ecosystems has the potential to enrich aquatic productivity and change algal composition. There has been increased cultural… (more)

▼ Nutrient transfer via runoff from terrestrial to aquatic ecosystems has the potential to enrich aquatic productivity and change algal composition. There has been increased cultural eutrophication of fresh water bodies from increased combustion and atmospheric deposition of nutrients, land development and associated erosion, agricultural fertilizers in runoff, and other non-point sources. Therefore, it is become increasingly important to understand nutrient transfer in natural systems, as this can inform effective watershed management. The goals of this study were to enhance our understanding of nutrient transfer via runoff from a watershed to a lake that has had relatively little changes over time, and to determine the influence of runoff on primary production. The first chapter provides an introduction to the project. The objectives of the second chapter were to assess macro- and micro-nutrient sources in the terrestrial area of Castle Lake, a small sub-alpine lake basin of the Upper Sacramento River Watershed, and to estimate nutrient input and timing through measurements of runoff and springs. Inflows were categorized by water source type (streams, waterfalls, other overland flow, litter interflow, or springs), vegetation type (conifer forest, conifer forest-shrub, alder, mixed, or no vegetation), and underlying bedrock (ultramafic, mafic, felsic, or a combination of these). Macro- and micro-nutrients were analyzed and differences between these ecotypes and seasons (fall rainstorms, winter snowmelt cycles, and spring snowmelt) were assessed. Nutrient concentrations were greater in litter interflow and riparian interflow samples from both the alder and coniferous areas. These areas had a relatively thick organic litter and organic soil layer that runoff was able to pass through prior to collection. N and P concentrations as well as loading were generally higher during fall rainstorms and winter snowmelt cycles than spring snowmelt. Underlying geologic parent material did seem to affect runoff and spring water quality. Areas with more mafic compositions exhibited higher concentrations of magnesium and heavy elements (chromium and nickel). Conversely, lighter elements (boron, chloride, and potassium) were also more concentrated in areas with more mafic compositions, possibly reflecting higher weathering rates of these ultramafic and mafic rocks. The objectives of the third chapter were to quantify the influence of natural runoff on pelagic primary productivity through a series of bioassay experiments. Essential nutrients and their respective concentrations were identified in a pulse of fall litter runoff and from a groundwater spring. The influences of these inflows on lake primary productivity rates were determined via a series of bioassay experiments. A comparison of traditional bioassays using nitrogen, phosphorus and other essential nutrients (molybdenum, boron, silica, and a mixture of trace elements) that have been shown to previously limit or were likely to limit productivity was utilized to contextualize the… Advisors/Committee Members: Chandra, Sudeep (advisor), Miller, Wally W. (committee member), Johnson, Dale W. (committee member), Henery, Rene (committee member).

Subjects/Keywords: bioassay; Castle Lake; nutrient; primary production; runoff

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APA (6^th Edition):

Mejica, B. N. (2014). Terrestrial-Aquatic Linkages: Watershed (Geologic and Vegetation) Runoff Influences on Primary Production of a Sub Alpine Lake. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/2984

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mejica, Brooke N. “Terrestrial-Aquatic Linkages: Watershed (Geologic and Vegetation) Runoff Influences on Primary Production of a Sub Alpine Lake.” 2014. Thesis, University of Nevada – Reno. Accessed January 17, 2021. http://hdl.handle.net/11714/2984.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mejica, Brooke N. “Terrestrial-Aquatic Linkages: Watershed (Geologic and Vegetation) Runoff Influences on Primary Production of a Sub Alpine Lake.” 2014. Web. 17 Jan 2021.

Vancouver:

Mejica BN. Terrestrial-Aquatic Linkages: Watershed (Geologic and Vegetation) Runoff Influences on Primary Production of a Sub Alpine Lake. [Internet] [Thesis]. University of Nevada – Reno; 2014. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/11714/2984.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mejica BN. Terrestrial-Aquatic Linkages: Watershed (Geologic and Vegetation) Runoff Influences on Primary Production of a Sub Alpine Lake. [Thesis]. University of Nevada – Reno; 2014. Available from: http://hdl.handle.net/11714/2984

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of the Western Cape

7. Ndebele-Murisa, Mzime R. An analysis of primary and secondary production in lake Kariba in a changing climate .

Degree: 2011, University of the Western Cape

URL: http://hdl.handle.net/11394/3583

► Analysis of temperature, rainfall and evaporation records over a 44-year period spanning the years 1964 to 2008 indicates changes in the climate around Lake Kariba.… (more)

▼ Analysis of temperature, rainfall and evaporation records over a 44-year period spanning the years 1964 to 2008 indicates changes in the climate around Lake Kariba. Mean annual temperatures have increased by approximately 1.5 °C, and pan evaporation rates by about 25%, with rainfall having declined by an average of 27.1 mm since 1964 at an average rate of 6.3 mm per decade. At the same time, lake water temperatures, evaporation rates, and water loss from the lake have increased, which have adversely affected lake water levels, nutrient and thermal dynamics. The most prominent influence of the changing climate on Lake Kariba has been a reduction in the lake water levels, averaging 9.5 m over the past two decades. These are associated with increased warming, reduced rainfall and diminished water and therefore nutrient inflow into the lake. The warmer climate has increased temperatures in the upper layers of lake water, the epilimnion, by an overall average of 1.9°C between 1965 and 2009. The warmer epilimnion has led to a more stable thermocline in the lake, and its upward migration from a previously reported 20 m depth to the current 2 to 5 m depth reported in the lake’s Sanyati Basin. A consequence of the more stable thermocline has been the trapping of greater amounts of nutrients in the deep, cold bottom waters of the lake, the hypolimnion, and this coupled with a shorter mixing (turnover) period is leading to reduced nutrient availability within the epilimnion. This is evident from a measured 50% reduction in nitrogen levels within the epilimnion, with phosphorus levels displaying a much smaller net decline due to localised sources of pollution inflows into the lake. These changes in lake thermal dynamics and density stratification have reduced the volume of the lake epilimnion by ~50%, which includes the well mixed, oxygenated euphotic zone leading to more acidic waters (lower pH) and increased water ionic concentrations (conductivity), and decreased dissolved oxygen levels, which have resulted in a 95% reduction in phytoplankton biomass and a 57% decline in primary production rates since the 1980s. The reduced nitrogen levels especially have contributed to a proliferation of nitrogen-fixing Cyanophyceae, the dominant Cylindrospermopsis raciborskii comprising up to 66% of the total phytoplankton biomass and 45.6% of the measured total phytoplankton cellular concentrations. Also, shifts in seasonal dominance of different phytoplankton groups have been observed in the lake during turnover, the Cyanophyceae having increased in dominance from 60% of the total phytoplankton biomass in the early 1980’s to the current 75%. In contrast, the Bacillariophyceae have declined substantially, from 18% of the total phytoplankton biomass in the early 1980’s to the current 1.7%. The diminished phytoplankton biomass of more palatable phytoplankton, and the proliferation of smaller, less palatable phytoplankton taxa, has resulted in reduced zooplankton biomass and species richness and altered zooplankton species composition.… Advisors/Committee Members: Musil, Charles (advisor), Raitt, Lincoln (advisor).

Subjects/Keywords: Climate warming; Limnology; Primary production; Phytoplankton; Zooplankton; Kapenta production; Lake Kariba

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APA (6^th Edition):

Ndebele-Murisa, M. R. (2011). An analysis of primary and secondary production in lake Kariba in a changing climate . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/3583

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ndebele-Murisa, Mzime R. “An analysis of primary and secondary production in lake Kariba in a changing climate .” 2011. Thesis, University of the Western Cape. Accessed January 17, 2021. http://hdl.handle.net/11394/3583.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ndebele-Murisa, Mzime R. “An analysis of primary and secondary production in lake Kariba in a changing climate .” 2011. Web. 17 Jan 2021.

Vancouver:

Ndebele-Murisa MR. An analysis of primary and secondary production in lake Kariba in a changing climate . [Internet] [Thesis]. University of the Western Cape; 2011. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/11394/3583.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ndebele-Murisa MR. An analysis of primary and secondary production in lake Kariba in a changing climate . [Thesis]. University of the Western Cape; 2011. Available from: http://hdl.handle.net/11394/3583

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Oklahoma

8. Wu, Xiaocui. Modelling terrestrial carbon fluxes and crop production with remote sensing and in-situ observations.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/325433

► Plants fix carbon through photosynthesis, sequestering carbon dioxide from the atmosphere and substantially mitigating the climate warming effect induced by anthropogenic CO2 emissions. Terrestrial gross… (more)

▼ Plants fix carbon through photosynthesis, sequestering carbon dioxide from the atmosphere and substantially mitigating the climate warming effect induced by anthropogenic CO2 emissions. Terrestrial gross primary production (GPP) through photosynthesis is crucial for understanding the land-atmospheric carbon exchange, which is the largest component and one of the most uncertain aspects of the global carbon cycle. Thus, accurate estimation of GPP can help better understand the global carbon budget, and the ecosystem sensitivity to the global climate change. Data driven models that utilize the climate data and remote sensing-based observations can provide reasonable estimates of GPP. The emergence of the solar induced chlorophyll fluorescence (SIF) from both in-situ and satellite observations provides another tool to understand and estimate plant photosynthesis. Remote sensing-based observations and models are also widely used in crop monitoring. Timely and accurate crop production estimation are needed to sustain global food security under the background of climate change. My overall objective is to improve the data-driven models to provide better GPP estimates, to combine SIF with other data sources to advance our understanding of the photosynthesis process and ecosystem sensitivity to droughts, and to investigate the potential of a data-driven model, specifically, the vegetation photosynthesis model (VPM), in crop monitoring. In Chapter 2, we investigated the seasonal dynamics of eddy flux-derived GPP (GPPEC), solar-induced chlorophyll fluorescence (SIF), and four vegetation indices (VIs) and their relationships in a tall grassland site. We also examined drought impact on those structural and physiological proxies of plant photosynthesis. We found SIF explained 49% of the GPP variability at the seasonal scale, and had a stronger consistency with GPP than the four VIs. Among the four VIs, the soil background corrected VIs, near-infrared reflectance of vegetation (NIRv) and enhanced vegetation index (EVI) showed the best consistency with both GPP and SIF. In addition, SIF is more sensitive to drought than the VIs. This study suggested that the potential of SIF in tracking photosynthesis in grassland and drought impact on photosynthesis. In Chapter 3, we improved the vegetation photosynthesis model (VPM) by considering the difference of the maximum light use efficiency for C3 and C4 croplands. Model validation against GPPEC in multiple sites distributed over CONUS suggests better accuracy of GPP simulated by VPM (GPPVPM) in tracking the cross-site variability and interannual variability (R2 = 0.84 and 0.46, respectively) when compared to MOD17 GPP. We also assessed the spatial and temporal (seasonal) consistency of GPPVPM, MOD17 GPP and other two common-used GPP products with the Global Ozone Monitoring Experiment-2 (GOME-2) SIF. We found good consistency of GPPVPM with SIF across space and time. Anomaly analyses for those GPP products and GOME-2 SIF showed that high GPP during the 2012 spring compensated for low GPP… Advisors/Committee Members: Xiao, Xiangming (advisor), Basara, Jeffrey (committee member), McCarthy, Heather (committee member), Souza, Lara (committee member), Steiner, Jean (committee member).

Subjects/Keywords: Remote sensing; Gross primary production; Crop production; Solar-induced chlorophyll fluorescence

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

APA (6^th Edition):

Wu, X. (2020). Modelling terrestrial carbon fluxes and crop production with remote sensing and in-situ observations. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/325433

Chicago Manual of Style (16^th Edition):

Wu, Xiaocui. “Modelling terrestrial carbon fluxes and crop production with remote sensing and in-situ observations.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed January 17, 2021. http://hdl.handle.net/11244/325433.

MLA Handbook (7^th Edition):

Wu, Xiaocui. “Modelling terrestrial carbon fluxes and crop production with remote sensing and in-situ observations.” 2020. Web. 17 Jan 2021.

Vancouver:

Wu X. Modelling terrestrial carbon fluxes and crop production with remote sensing and in-situ observations. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/11244/325433.

Council of Science Editors:

Wu X. Modelling terrestrial carbon fluxes and crop production with remote sensing and in-situ observations. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/325433

Utah State University

9. Hsu, Joanna S. Potential Effects of Altered Precipitation Regimes on Primary Production in Terrestrial Ecosystems.

Degree: MS, Wildland Resources, 2011, Utah State University

URL: https://digitalcommons.usu.edu/etd/1053

► In addition to causing an increase in mean temperatures, climate change is also altering precipitation regimes across the globe. General circulation models project both… (more)

▼ In addition to causing an increase in mean temperatures, climate change is also altering precipitation regimes across the globe. General circulation models project both latitude-dependent changes in precipitation mean and increases in precipitation variability. These changes in water availability will impact terrestrial primary productivity, the fixation of carbon dioxide into organic matter by plants. In my thesis, I addressed the following three questions: 1.) What will be the relative effect of changes in the mean and standard deviation of annual precipitation on mean annual primary production? 2.) Which ecosystems will be the most sensitive to changes in precipitation? 3.) Will increases in production variability be disproportionately greater than increases in precipitation variability? I gathered 58 time series of annual precipitation and aboveground net primary production (ANPP) from long-term ecological study sites across the globe. I quantified the sensitivity of ANPP at each site to changes in precipitation mean and variance. My results indicated that mean ANPP is about 40 times more sensitive to changes in precipitation mean than to changes in precipitation variance. I showed that semi-arid ecosystems such as shortgrass steppe in Colorado or typical steppe in Inner Mongolia may be the most sensitive to changes in precipitation mean. At these sites and several others, a 1% change in mean precipitation may result in a change in ANPP that is greater than 1%. To address how increases in interannual precipitation variability will impact the variability of ANPP, I perturbed the variability of observed precipitation time series and evaluated the impact of this perturbation on predicted ANPP variability. I found that different assumptions about the precipitation-ANPP relationship had different implications for how increases in precipitation variability will impact ANPP variability. Increases in ANPP variability were always directly proportional to increases in precipitation variability when ANPP was modeled as a simple linear or a lagged function of precipitation. However, when ANPP was modeled as a nonlinear, saturating function of precipitation, increases in ANPP variability were disproportionately low compared to increases in precipitation variability during wet years but disproportionately high during dry years. My thesis addresses an existing research gap regarding the long-term impact of increases in interannual precipitation variability on key ecosystem functioning. I showed that increases in precipitation variability will have negligible impacts on ANPP mean and have disproportionately large impacts on ANPP variability only when ANPP is a concave down, nonlinear function of precipitation. My work also demonstrates the importance of the precipitation-ANPP relationship in determining the magnitude of impacts to ANPP caused by changes in precipitation. Finally, my thesis highlights the potential for considerable changes in ANPP variability due to increases in precipitation variability. Advisors/Committee Members: Peter B. Adler, Ronald J. Ryel, John M. Stark, ;.

Subjects/Keywords: aboveground net primary production; climate change; grasslands; precipitation; precipitation variability; primary production; Physical Sciences and Mathematics

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APA (6^th Edition):

Hsu, J. S. (2011). Potential Effects of Altered Precipitation Regimes on Primary Production in Terrestrial Ecosystems. (Masters Thesis). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/1053

Chicago Manual of Style (16^th Edition):

Hsu, Joanna S. “Potential Effects of Altered Precipitation Regimes on Primary Production in Terrestrial Ecosystems.” 2011. Masters Thesis, Utah State University. Accessed January 17, 2021. https://digitalcommons.usu.edu/etd/1053.

MLA Handbook (7^th Edition):

Hsu, Joanna S. “Potential Effects of Altered Precipitation Regimes on Primary Production in Terrestrial Ecosystems.” 2011. Web. 17 Jan 2021.

Vancouver:

Hsu JS. Potential Effects of Altered Precipitation Regimes on Primary Production in Terrestrial Ecosystems. [Internet] [Masters thesis]. Utah State University; 2011. [cited 2021 Jan 17]. Available from: https://digitalcommons.usu.edu/etd/1053.

Council of Science Editors:

Hsu JS. Potential Effects of Altered Precipitation Regimes on Primary Production in Terrestrial Ecosystems. [Masters Thesis]. Utah State University; 2011. Available from: https://digitalcommons.usu.edu/etd/1053

10. Truong, Van Vinh. Carbon stocks and fluxes in tropical mangrove (Southern Vietnam) : Stocks et flux de carbone dans la mangrove de Can Gio (Vietnam).

Degree: Docteur es, Sciences de la terre et de l’environnement, 2018, Nouvelle Calédonie

URL: http://www.theses.fr/2018NCAL0002

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Les forêts de mangrove contribuent de manière significative au flux d'énergie, au cycle des nutriments et du carbone dans l'océan côtier, étant un puits pour… (more)

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Les forêts de mangrove contribuent de manière significative au flux d'énergie, au cycle des nutriments et du carbone dans l'océan côtier, étant un puits pour le CO2 atmosphérique. Les forêts de mangroves sont très productives et stockent une quantité élevée de carbone à la fois dans leurs sols et dans leur biomasse.Au cours de la décomposition de la litière, les nutriments et le carbone peuvent être recyclés ou exportés vers les écosystèmes adjacents par l'action des marées. La mangrove de Can Gio (Ho Chi Minh Ville, Vietnam), dégradée par l'épandage de défoliants pendant la guerre du Vietnam, a pu être restaurée grâce à la replantation et à la régénération naturelle. À ce jour, la forêt de mangrove de Can Gio est la plus grande forêt de mangrove contiguë au Vietnam, et est devenue la première réserve biosphère UNESCO dans ce pays. L'objectif principal de cette thèse était de caractériser le cycle du carbone dans la forêt de mangrove tropicale.Les résultats de cette thèse ont permis de:- Développer des équations allométriques permettant d’estimer la biomasse aérienne de la forêt plantée de mangroves de l’espèceRhizophora apiculatadans le sud du Vietnam;- Calculer les stocks de carbone totaux dans différents peuplements de mangrove se développant sous le climat tropical du sud du Vietnam;- Caractériser les taux de décomposition de la litière et évaluer la dynamique des nutriments et des métaux traces au cours des processus de dégradation de la litière, ainsi que l'évolution de δ13C pendant la décomposition;- Déterminer la variabilité saisonnière des flux de CO2 à différentes interfaces: sol-air, eau-air et tronc-air, et caractériser les profils de concentration en CO2 dans la canopée.

Mangrove forests significantly contribute to energy flow, nutrient and carbon cycling in the coastal ocean, being a sink for atmospheric CO2. Mangroves forests are highly productive and store high amount of carbon both in their soils and in their biomass. During leaf litter decomposition, nutrients and carbon can be recycled or exported to adjacent ecosystems by the tidal action. Can Gio mangrove, degraded by the spraying of defoliants during the Vietnam War, successfully recovered through replantation and natural regeneration after 40 years. To date, the Can Gio mangrove forest is the largest contiguous mangrove forest in Vietnam, and became the first Mangrove Biosphere Reserve in this country. The main objective of this PhD thesis was to characterize carbon cycling within the Can Gio mangrove forest, which is a tropical one.The results of this PhD thesis allowed to: - Develop allometric equations and to estimate the aboveground biomass of Rhizophora apiculata Blume planted mangroves forest in Southern Vietnam; - Calculate the total carbon stocks in different mangrove stands developing under the tropical climate of Southern Vietnam; - Characterize the leaf litter decomposition rates, and assess nutrients and trace metals dynamics during litter decay processes, as well as the evolution of δ13C during decay; - Determine the seasonal…

Advisors/Committee Members: Marchand, Cyril (thesis director), Allenbach, Michel (thesis director).

Subjects/Keywords: Mangrove; Production primaire; Cycle du carbone; Mangrove; Primary production; Carbon cycle; 577.698; 581.7; 333.7

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APA (6^th Edition):

Truong, V. V. (2018). Carbon stocks and fluxes in tropical mangrove (Southern Vietnam) : Stocks et flux de carbone dans la mangrove de Can Gio (Vietnam). (Doctoral Dissertation). Nouvelle Calédonie. Retrieved from http://www.theses.fr/2018NCAL0002

Chicago Manual of Style (16^th Edition):

Truong, Van Vinh. “Carbon stocks and fluxes in tropical mangrove (Southern Vietnam) : Stocks et flux de carbone dans la mangrove de Can Gio (Vietnam).” 2018. Doctoral Dissertation, Nouvelle Calédonie. Accessed January 17, 2021. http://www.theses.fr/2018NCAL0002.

MLA Handbook (7^th Edition):

Truong, Van Vinh. “Carbon stocks and fluxes in tropical mangrove (Southern Vietnam) : Stocks et flux de carbone dans la mangrove de Can Gio (Vietnam).” 2018. Web. 17 Jan 2021.

Vancouver:

Truong VV. Carbon stocks and fluxes in tropical mangrove (Southern Vietnam) : Stocks et flux de carbone dans la mangrove de Can Gio (Vietnam). [Internet] [Doctoral dissertation]. Nouvelle Calédonie; 2018. [cited 2021 Jan 17]. Available from: http://www.theses.fr/2018NCAL0002.

Council of Science Editors:

Truong VV. Carbon stocks and fluxes in tropical mangrove (Southern Vietnam) : Stocks et flux de carbone dans la mangrove de Can Gio (Vietnam). [Doctoral Dissertation]. Nouvelle Calédonie; 2018. Available from: http://www.theses.fr/2018NCAL0002

11. Llort Jordi, Joan. Bloom phenology, mechanisms and future change in the Southern Ocean : Phénologie, mécanismes et changement futur du cycle saisonnier phytoplanktonique dans l'Océan Austral.

Degree: Docteur es, Océanographie, 2015, Université Pierre et Marie Curie – Paris VI

URL: http://www.theses.fr/2015PA066064

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La production primaire (PP) dans l'Océan Austral joue un rôle crucial dans la capacité des océans à absorber le carbon atmosphérique. Elle est caractérisée par… (more)

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La production primaire (PP) dans l'Océan Austral joue un rôle crucial dans la capacité des océans à absorber le carbon atmosphérique. Elle est caractérisée par une forte limitation en Fer et par un cycle saisonnier très marqué, présentant un bloom planctonique en fin d'hiver, plus ou moins intense selon les régions. Ma thèse est centrée sur la compréhension des mécanismes qui contrôlent ce bloom et sa variabilité, ainsi que sur les éléments, présents et futurs, qui contrôlent son intensité. J'ai abordé le premier aspect (phénologie et mécanismes) en mettant en place une approche mécaniste basée sur une nouvelle configuration du modèle biogéochimique PISCES forcé par un environnement physique 1D idéalisé. Cette méthodologie m'a permis de réconcilier les différentes théories sur la formation des blooms aux hautes-latitudes, d'identifier les spécificités du bloom de l'Océan Austral et de proposer des critères adaptés à sa détection dans les observations. En outre, les résultats de cette étude de modélisation ont été confrontés à ceux issues d'une deuxième approche, basée sur des observations satellitaires, ce qui a permis la localisation géographique des différentes phénologies de bloom que j'ai identifiées dans l'Océan Austral. Pour répondre au deuxième aspect (altération et changements futurs), j'ai également suivi une double approche. J'ai d'abord examiné comment les limitations par la lumière et par le fer se combinent, via la variabilité du cycle saisonnier du mélange vertical, et pilotent ainsi la production primaire dans l'Océan Austral actuel à l'aide de la configuration idéalisée présentée plus haut. Dans un deuxième temps, cette analyse a permis d'aider à l’interprétation des variations de PP observées dans les projections climatiques issues de 8 modèles couplés (CMIP5). L'ensemble de mes résultats permet de mieux comprendre les processus physiques et biologiques qui contrôlent la croissance du phytoplancton dans l'Océan Austral et d'appréhender comment la modification de ces processus peut entraîner des altérations de la PP dans une région clé pour l'évolution future du climat.

Primary production (PP) in the Southern Ocean (SO) plays a crucial role on atmospheric carbon uptake. PP in this ocean is highly iron-limited and presents a marked seasonal cycle. Such a seasonal cycle has a strong productive phase in late winter, called bloom, which distribution and intensity is highly variable. My PhD focus on two specific aspects of the PP in the SO: first, the mechanisms that drive such a bloom and its dynamics and, second, the elements able to control the bloom intensity at present and in the future. The first aspect (bloom phenology and mechanisms) was addressed by setting up a mechanistic approach based on a novel model configuration: a complex biogeochemical model (PISCES) forced by a 1D idealised physical framework. This methodology allowed me to conciliate the different bloom formation theories and to identify the SO bloom specificities. Moreover, I proposed how to use different bloom detection criteria to…

Advisors/Committee Members: Lesommer, Julien (thesis director), Lévy, Marina (thesis director).

Subjects/Keywords: Bloom; Phytoplancton; Océan Austral; Changement Climatique; Modèle biogéochimique; Production Primaire; Primary production; Southern Ocean; 551.462

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APA (6^th Edition):

Llort Jordi, J. (2015). Bloom phenology, mechanisms and future change in the Southern Ocean : Phénologie, mécanismes et changement futur du cycle saisonnier phytoplanktonique dans l'Océan Austral. (Doctoral Dissertation). Université Pierre et Marie Curie – Paris VI. Retrieved from http://www.theses.fr/2015PA066064

Chicago Manual of Style (16^th Edition):

Llort Jordi, Joan. “Bloom phenology, mechanisms and future change in the Southern Ocean : Phénologie, mécanismes et changement futur du cycle saisonnier phytoplanktonique dans l'Océan Austral.” 2015. Doctoral Dissertation, Université Pierre et Marie Curie – Paris VI. Accessed January 17, 2021. http://www.theses.fr/2015PA066064.

MLA Handbook (7^th Edition):

Llort Jordi, Joan. “Bloom phenology, mechanisms and future change in the Southern Ocean : Phénologie, mécanismes et changement futur du cycle saisonnier phytoplanktonique dans l'Océan Austral.” 2015. Web. 17 Jan 2021.

Vancouver:

Llort Jordi J. Bloom phenology, mechanisms and future change in the Southern Ocean : Phénologie, mécanismes et changement futur du cycle saisonnier phytoplanktonique dans l'Océan Austral. [Internet] [Doctoral dissertation]. Université Pierre et Marie Curie – Paris VI; 2015. [cited 2021 Jan 17]. Available from: http://www.theses.fr/2015PA066064.

Council of Science Editors:

Llort Jordi J. Bloom phenology, mechanisms and future change in the Southern Ocean : Phénologie, mécanismes et changement futur du cycle saisonnier phytoplanktonique dans l'Océan Austral. [Doctoral Dissertation]. Université Pierre et Marie Curie – Paris VI; 2015. Available from: http://www.theses.fr/2015PA066064

12. Racine, Calypso. Écologie des foraminifères benthiques en domaine arctique dans un contexte de changements climatiques : cas des mers de Chukchi, Barents et Baffin : Ecology of modern arctic benthic foraminifera within a context of climate change : case studies in the Chukchi Sea, Barents Sea and Baffin Bay.

Degree: Docteur es, Sédimentologie marine et paléoclimats, 2019, Bordeaux

URL: http://www.theses.fr/2019BORD0008

► Les foraminifères benthiques sont largement utilisés en océanographie comme bio-indicateurs paléoclimatiques et paléoenvironnementaux du fait de leur présence dans tous les milieux marins, leur sensibilité… (more)

▼ Les foraminifères benthiques sont largement utilisés en océanographie comme bio-indicateurs paléoclimatiques et paléoenvironnementaux du fait de leur présence dans tous les milieux marins, leur sensibilité aux changements environnementaux et leur grande capacité de fossilisation. Néanmoins, leur utilisation nécessite une connaissance approfondie de leur écologie et des paramètres contrôlant leur distribution. Si les connaissances sur l’écologie des foraminifères benthiques sont de plus en plus complètes, elles demeurent très sporadiques dans la zone arctique, système complexe caractérisé par des interactions multiples entre l'atmosphère, l'océan et la cryosphère, pourtant au coeur du changement climatique global. L'amplification polaire du changement climatique conduit les régions des hautes latitudes à se réchauffer près de deux fois plus vite que les régions tempérées. Dans ce contexte, cette thèse s'attache à mieux comprendre l'écologie des foraminifères benthiques vivants dans plusieurs régions arctiques et définir l'importance du contrôle des paramètres environnementaux sur les faunes tels que les propriétés des masses d'eau, la productivité primaire et le flux de matière organique ainsi que la dynamique de la glace de mer. Les foraminifères benthiques vivants ont été analysés dans les premiers centimètres de sédiment de 21 carottes d’interfaces prélevées dans trois régions arctiques durant les étés 2014 et 2015 : la mer de Barents, la baie de Baffin et la mer de Chukchi. Ces trois régions présentent des particularités en termes de couvert de banquise, de circulation des masses d’eau ou de dynamique de la production primaire. Nos résultats montrent que ces facteurs influencent la distribution des foraminifères benthiques. Le flux de matière organique qui résulte de la forte productivité primaire printanière aux abords des fronts polaires hydrographiques, des bordures de glace de mer (zones marginales de glace) et dans la polynie des eaux du nord (baie de Baffin) impacte la densité et la diversité des faunes et favorise le développement de certaines espèces. Nonionellina labradorica dans les eaux arctiques froides et Cassidulina neoteretis associée aux eaux atlantiques répondent aux apports de matière organique fraîche tandis que Melonis barleeanus s’accommode des milieux riches en matière organique plus dégradée. Dans les environnements oligotrophes plus profonds, Oridorsalis tenerus est une espèce ubiquiste. Cette espèce est associée à Cibicidoides wuellerstorfi sur la marge ouest de la mer de Barents et Ioanella tumidula dans le bassin plus profond au nord de la mer de Chukchi. Les propriétés physiques et chimiques des masses d’eau contraignent également la distribution faunistique. En baie de Baffin et sur le plateau de la mer de Chukchi, les eaux corrosives engendrent la dissolution des carbonates, favorisant la dominance des espèces agglutinées. Les études menées dans le cadre de cette thèse permettent de calibrer l'outil foraminifère benthique dans l'actuel et d'affiner leur utilisation en tant que proxy… Advisors/Committee Members: Giraudeau, Jacques (thesis director), Bonnin, Jérôme (thesis director).

Subjects/Keywords: Foraminifères benthiques; Arctique; Production primaire; Matière organique; Benthic foraminifera; Arctic; Primary production; Organic matter

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

APA (6^th Edition):

Racine, C. (2019). Écologie des foraminifères benthiques en domaine arctique dans un contexte de changements climatiques : cas des mers de Chukchi, Barents et Baffin : Ecology of modern arctic benthic foraminifera within a context of climate change : case studies in the Chukchi Sea, Barents Sea and Baffin Bay. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2019BORD0008

Chicago Manual of Style (16^th Edition):

Racine, Calypso. “Écologie des foraminifères benthiques en domaine arctique dans un contexte de changements climatiques : cas des mers de Chukchi, Barents et Baffin : Ecology of modern arctic benthic foraminifera within a context of climate change : case studies in the Chukchi Sea, Barents Sea and Baffin Bay.” 2019. Doctoral Dissertation, Bordeaux. Accessed January 17, 2021. http://www.theses.fr/2019BORD0008.

MLA Handbook (7^th Edition):

Racine, Calypso. “Écologie des foraminifères benthiques en domaine arctique dans un contexte de changements climatiques : cas des mers de Chukchi, Barents et Baffin : Ecology of modern arctic benthic foraminifera within a context of climate change : case studies in the Chukchi Sea, Barents Sea and Baffin Bay.” 2019. Web. 17 Jan 2021.

Vancouver:

Racine C. Écologie des foraminifères benthiques en domaine arctique dans un contexte de changements climatiques : cas des mers de Chukchi, Barents et Baffin : Ecology of modern arctic benthic foraminifera within a context of climate change : case studies in the Chukchi Sea, Barents Sea and Baffin Bay. [Internet] [Doctoral dissertation]. Bordeaux; 2019. [cited 2021 Jan 17]. Available from: http://www.theses.fr/2019BORD0008.

Council of Science Editors:

Racine C. Écologie des foraminifères benthiques en domaine arctique dans un contexte de changements climatiques : cas des mers de Chukchi, Barents et Baffin : Ecology of modern arctic benthic foraminifera within a context of climate change : case studies in the Chukchi Sea, Barents Sea and Baffin Bay. [Doctoral Dissertation]. Bordeaux; 2019. Available from: http://www.theses.fr/2019BORD0008

Technical University of Lisbon

13. Gabriel, Ana Paula Oliveira da Silva. Contributo para o estudo da segurança sanitária na helicicultura em Portugal.

Degree: 2013, Technical University of Lisbon

URL: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5381

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Dissertação de Mestrado em Segurança Alimentar

A legislação alimentar na União Europeia promove a segurança sanitária dos géneros alimentícios desde a produção primária e pelo… (more)

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Dissertação de Mestrado em Segurança Alimentar

A legislação alimentar na União Europeia promove a segurança sanitária dos géneros alimentícios desde a produção primária e pelo circuito comercial com o objetivo de proteger a vida e a saúde dos seus consumidores. A União Europeia é o maior importador, a nível mundial, de caracóis terrestres, graças à tradição do seu consumo nos países mediterrânicos, em que Portugal se inclui. A helicicultura é uma atividade na área da produção animal que teve o seu desenvolvimento comercial nas últimas décadas do século XX e que foi reconhecida como tal em Portugal, a nível legislativo, a partir de 2007. De que forma a legislação sobre a segurança sanitária na produção primária é aplicada atualmente neste setor é o objetivo principal do inquérito aplicado, tal como identificar as práticas de maneio produtivo. As respostas dos helicicultores indicam que o setor ainda está numa fase de reconhecimento e que a implementação de regras de higiene transversais à produção animal ainda estão no início e faltam regras específicas relativas ao alimento caracol. As caraterísticas da espécie e as inerentes ao biótopo onde se desenvolvem, indiciam que os perigos devem ser identificados e avaliados os riscos com o objetivo de sugerir práticas específicas para a produção primária e operações conexas, que podem ser materializadas num Código de Boas Práticas.

ABSTRACT - Contribution for the study of food safety in heliculture in Portugal - Food legislation in the European Union (EU) promotes food safety from primary production throughout the food chain, to ensure consumers safety and health. The EU is the world biggest importer of terrestrial snails, given the tradition of their consumption in Mediterranean countries, including Portugal. Heliculture as a production sector was commercially developed in the last decades of the 20th century and has been legislated in Portugal since 2007. The main goal of this work was the assessment of the current application of food safety legislation for primary production to snail farming using a questionnaire which also aims to identify management and production practices. The answers collected from the snail farmers show that the sector is still being developed and the implementation of transversal hygiene standards to livestock primary production are in early stages. Some specific rules related to snail as a food stuff are still missing. Species characteristics and the biotope where snails grow, suggest that hazards should be identified and risks assessed in order to promote specific practices for primary production and associated operations, that should be brought together in a Guide to Good Practice.

Advisors/Committee Members: Vaz, Yolanda Maria.

Subjects/Keywords: Legislação; produção primária; higiene; caracol; legislation; primary production; hygiene; snail

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APA (6^th Edition):

Gabriel, A. P. O. d. S. (2013). Contributo para o estudo da segurança sanitária na helicicultura em Portugal. (Thesis). Technical University of Lisbon. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5381

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gabriel, Ana Paula Oliveira da Silva. “Contributo para o estudo da segurança sanitária na helicicultura em Portugal.” 2013. Thesis, Technical University of Lisbon. Accessed January 17, 2021. http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5381.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gabriel, Ana Paula Oliveira da Silva. “Contributo para o estudo da segurança sanitária na helicicultura em Portugal.” 2013. Web. 17 Jan 2021.

Vancouver:

Gabriel APOdS. Contributo para o estudo da segurança sanitária na helicicultura em Portugal. [Internet] [Thesis]. Technical University of Lisbon; 2013. [cited 2021 Jan 17]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5381.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gabriel APOdS. Contributo para o estudo da segurança sanitária na helicicultura em Portugal. [Thesis]. Technical University of Lisbon; 2013. Available from: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5381

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Utah

14. Blonquist, J. Mark Jr. The potential of carbonyl sulfide as a proxy for gross primary production at flux tower sites.

Degree: MS, Biology, 2012, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1819/rec/2627

► Seasonal dynamics of atmospheric carbonyl sulfide (OCS) at regional and continental scales and plant OCS exchange at the leaf level have shown a close relationship… (more)

Subjects/Keywords: Carbonyl sulfide; Gross primary production; Flux tower sites; OCS; GPP proxy

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APA (6^th Edition):

Blonquist, J. M. J. (2012). The potential of carbonyl sulfide as a proxy for gross primary production at flux tower sites. (Masters Thesis). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1819/rec/2627

Chicago Manual of Style (16^th Edition):

Blonquist, J Mark Jr. “The potential of carbonyl sulfide as a proxy for gross primary production at flux tower sites.” 2012. Masters Thesis, University of Utah. Accessed January 17, 2021. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1819/rec/2627.

MLA Handbook (7^th Edition):

Blonquist, J Mark Jr. “The potential of carbonyl sulfide as a proxy for gross primary production at flux tower sites.” 2012. Web. 17 Jan 2021.

Vancouver:

Blonquist JMJ. The potential of carbonyl sulfide as a proxy for gross primary production at flux tower sites. [Internet] [Masters thesis]. University of Utah; 2012. [cited 2021 Jan 17]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1819/rec/2627.

Council of Science Editors:

Blonquist JMJ. The potential of carbonyl sulfide as a proxy for gross primary production at flux tower sites. [Masters Thesis]. University of Utah; 2012. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1819/rec/2627

Texas A&M University

15. Kim, Jongsun. Implications of Different Nitrogen Input Sources for Primary Production and Carbon Flux Estimates in Coastal Waters.

Degree: PhD, Oceanography, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/173902

► The coastal Gulf of Mexico (GOM) and Coastal Sea off Korea (CSK) both suffer from eutrophication and/or hypoxia, both of which are driven mainly by… (more)

▼ The coastal Gulf of Mexico (GOM) and Coastal Sea off Korea (CSK) both suffer from eutrophication and/or hypoxia, both of which are driven mainly by humans. We compared two different regions with different nitrogen input sources to estimate organic carbon fluxes and predict future carbon fluxes based on our model scenarios. This research focuses on how we take advantage of carbon-nitrogen cycling and ecological consequences to estimate the effects of future nutrient inputs. We tested the Rowe and Chapman (RC02) three-zone hypothesis of hypoxia using two different methods. We found that RC02 applied only in certain seasons and that a major nutrient input source is necessary. We used both nutrient/salinity relationships and a N-mass balance model to identify three different zones, each with different productivity and carbon fluxes. We define the brown zone as having a linear nutrient/salinity relationship, where physical forcing (river flow) dominates over local production, and defined the blue zone as having nutrient (N or Si) concentrations < 1 μM. The green zone, with variable nutrient concentrations, occurs between them. Based on our N-mass balance model results, we could set the potential primary production rate in the brown zone of the GOM and CSK, respectively, as over 2 (GOM) and over 1.5 gC m^-2 day^-1 (CSK). In the green zone, production was between 0.1 to 2 (GOM) and 0.3 to 1.5 gC m^-2 day^-1 (CSK) and in the blue zone less than 0.1and 0.3 gC m^-2 day^-1, respectively. From our results, we have estimated the fluxes of nitrogen via the atmosphere, groundwater, and river to the ocean, based on observational and literature data. The coastal Gulf of Mexico receives nitrogen predominantly from the Mississippi and Atchafalaya Rivers and AN-D is only a minor component in this region. However, in the coastal sea off Korea, either groundwater or atmospheric nitrogen deposition is more important controlling factors of our model results. In the future, we need to consider collecting data on both groundwater and AN-D inputs in investigations of chemical cycling in the coastal ocean Advisors/Committee Members: Chapman, Piers (advisor), Rowe, Gilbert (committee member), DiMarco, Steven (committee member), Thorton, Daniel (committee member).

Subjects/Keywords: Nitrogen; Atmospheric Nitrogen Deposition (AN-D); Primary Production; Carbon flux

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APA (6^th Edition):

Kim, J. (2018). Implications of Different Nitrogen Input Sources for Primary Production and Carbon Flux Estimates in Coastal Waters. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173902

Chicago Manual of Style (16^th Edition):

Kim, Jongsun. “Implications of Different Nitrogen Input Sources for Primary Production and Carbon Flux Estimates in Coastal Waters.” 2018. Doctoral Dissertation, Texas A&M University. Accessed January 17, 2021. http://hdl.handle.net/1969.1/173902.

MLA Handbook (7^th Edition):

Kim, Jongsun. “Implications of Different Nitrogen Input Sources for Primary Production and Carbon Flux Estimates in Coastal Waters.” 2018. Web. 17 Jan 2021.

Vancouver:

Kim J. Implications of Different Nitrogen Input Sources for Primary Production and Carbon Flux Estimates in Coastal Waters. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1969.1/173902.

Council of Science Editors:

Kim J. Implications of Different Nitrogen Input Sources for Primary Production and Carbon Flux Estimates in Coastal Waters. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173902

Texas A&M University

16. Ou, Chouly. Floodplain River Foodwebs in the Lower Mekong Basin.

Degree: PhD, Wildlife and Fisheries Sciences, 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/151776

► The Mekong River is one of the world’s most important rivers in terms of its size, economic importance, cultural significance, productivity, and biodiversity. The Mekong… (more)

▼ The Mekong River is one of the world’s most important rivers in terms of its size, economic importance, cultural significance, productivity, and biodiversity. The Mekong River’s fisheries and biodiversity are threatened by major hydropower development and over-exploitation. Knowledge of river food web ecology is essential for management of the impacts created by anthropogenic activities on plant and animal populations and ecosystems. In the present study, I surveyed four tropical rivers in Cambodia within the Mekong River Basin. I examined the basal production sources supporting fish biomass in the four rivers during the dry and wet seasons and explored the relationship between trophic position and body size of fish at various taxonomic levels, among local species assemblages, and across trophic guilds. I used stable isotopes of carbon and nitrogen to estimate fish trophic levels and the principal primary production sources supporting fishes. My study provides evidence that food web dynamics in tropical rivers undergo significant seasonal shifts and emphasizes that river food webs are altered by dams and flow regulation. Seston and benthic algae were the most important production sources supporting fish biomass during the dry season, and riparian macrophytes appeared to be the most important production source supporting fishes during the wet season. In the river with strong flow regulation from an upstream impoundment, seston and benthic algae were even more important production sources supporting fishes during the dry season. My findings challenge the Eltonian theory of size-based trophic structure in food webs and also contradict the broadly accepted prediction of the fishing-down-the-food-web concept. Eltonian and fishing-down-the-food-web concepts propose that trophic level is strongly correlated with body size, but I found no significant correlation between body size and trophic position for fish assemblages. Results suggest that body size distributions are not useful for prediction the trophic structure of communities with diverse detritivores, omnivores and insectivores, but that it is a good predictor of trophic position among piscivorous fishes. Advisors/Committee Members: Winemiller, Kirk O (advisor), Fujiwara, Masami (committee member), Olszewski, Thomas D (committee member), Roelke, Daniel L (committee member).

Subjects/Keywords: Primary production sources; trophic position; stable isotopes; fisheries

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APA (6^th Edition):

Ou, C. (2013). Floodplain River Foodwebs in the Lower Mekong Basin. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151776

Chicago Manual of Style (16^th Edition):

Ou, Chouly. “Floodplain River Foodwebs in the Lower Mekong Basin.” 2013. Doctoral Dissertation, Texas A&M University. Accessed January 17, 2021. http://hdl.handle.net/1969.1/151776.

MLA Handbook (7^th Edition):

Ou, Chouly. “Floodplain River Foodwebs in the Lower Mekong Basin.” 2013. Web. 17 Jan 2021.

Vancouver:

Ou C. Floodplain River Foodwebs in the Lower Mekong Basin. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1969.1/151776.

Council of Science Editors:

Ou C. Floodplain River Foodwebs in the Lower Mekong Basin. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151776

University of California – San Diego

17. Fox, Michael Douglas. The trophic ecology of reef-building corals: the influence of resource availability on coral nutrition at multiple scales.

Degree: Marine biology, 2018, University of California – San Diego

URL: http://www.escholarship.org/uc/item/1gr399tm

► Understanding the natural processes that drive resource distribution and the associated response of organisms is a principal goal in ecology. Mixotrophic organisms are particularly interesting… (more)

▼ Understanding the natural processes that drive resource distribution and the associated response of organisms is a principal goal in ecology. Mixotrophic organisms are particularly interesting in this regard because their fitness is linked to the resources essential for both primary producers (e.g., light and nutrients) and consumers (e.g., food). Reef-building corals are among the most widely distributed mixotrophs and form the foundation of one of the most productive and diverse marine ecosystems, coral reefs. To date, a disproportionate amount of research has focused on the role of endosymbiotic microalgae in defining coral nutrition and we have a limited understanding of how corals respond to variation in food availability through time and space. This dissertation examines how mixotrophic corals can modify their nutritional modes in accordance with resource availability at multiple spatial scales. The Southern Line Islands of Kiribati in the central Pacific Ocean span a known upwelling gradient and have distinct differences in nearshore primary production. Combining remotely sensed estimates of surface chl-a as a proxy for food availability and stable isotope analysis of a common coral species, I found that corals are more heterotrophic at more productive islands. I then extended this relationship globally by synthesizing published isotopic data on corals and found that large-scale patterns of chl-a can predict how heterotrophic corals are likely to be. I then developed a more precise method to studying coral trophic ecology at finer spatial scales. Using δ13C analysis of amino acids, I found extreme trophic plasticity (0-100% contribution of heterotrophic nutrition) among conspecific corals at the scale of meters to kilometers around Palmyra Atoll. Finally, I conducted a nutrient enrichment experiment to examine the physiological responses of corals to changes in autotrophic nutrition in the absence of heterotrophic nutrition. I found that elevated nutrient concentrations have species-specific effects on coral calcification likely due to modifications in resource sharing between corals and their endosymbionts. Collectively, the results of my dissertation address a critical knowledge gap in coral biology and provide a framework to resolve the importance of heterotrophic nutrition in the persistence of coral reef ecosystems in an era of global change.

Subjects/Keywords: Ecology; Coral reefs; Heterotrophy; Nutrients; Phytoplankton; Primary Production; Stable Isotopes

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APA (6^th Edition):

Fox, M. D. (2018). The trophic ecology of reef-building corals: the influence of resource availability on coral nutrition at multiple scales. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/1gr399tm

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fox, Michael Douglas. “The trophic ecology of reef-building corals: the influence of resource availability on coral nutrition at multiple scales.” 2018. Thesis, University of California – San Diego. Accessed January 17, 2021. http://www.escholarship.org/uc/item/1gr399tm.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fox, Michael Douglas. “The trophic ecology of reef-building corals: the influence of resource availability on coral nutrition at multiple scales.” 2018. Web. 17 Jan 2021.

Vancouver:

Fox MD. The trophic ecology of reef-building corals: the influence of resource availability on coral nutrition at multiple scales. [Internet] [Thesis]. University of California – San Diego; 2018. [cited 2021 Jan 17]. Available from: http://www.escholarship.org/uc/item/1gr399tm.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fox MD. The trophic ecology of reef-building corals: the influence of resource availability on coral nutrition at multiple scales. [Thesis]. University of California – San Diego; 2018. Available from: http://www.escholarship.org/uc/item/1gr399tm

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manitoba

18. Watchorn, Kristen Elise. Effects of water level management on water chemistry and primary production of boreal marshes in northern Manitoba, Canada.

Degree: Biological Sciences, 2011, University of Manitoba

URL: http://hdl.handle.net/1993/4399

► This experiment manipulated water levels in boreal marshes within the Saskatchewan River Delta, a 9500 km2 region in northern Canada. Water levels in three wetland… (more)

Subjects/Keywords: wetlands; marshes; Summerberry Marsh; water chemistry; primary production; algae; macrophytes

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APA (6^th Edition):

Watchorn, K. E. (2011). Effects of water level management on water chemistry and primary production of boreal marshes in northern Manitoba, Canada. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/4399

Chicago Manual of Style (16^th Edition):

Watchorn, Kristen Elise. “Effects of water level management on water chemistry and primary production of boreal marshes in northern Manitoba, Canada.” 2011. Masters Thesis, University of Manitoba. Accessed January 17, 2021. http://hdl.handle.net/1993/4399.

MLA Handbook (7^th Edition):

Watchorn, Kristen Elise. “Effects of water level management on water chemistry and primary production of boreal marshes in northern Manitoba, Canada.” 2011. Web. 17 Jan 2021.

Vancouver:

Watchorn KE. Effects of water level management on water chemistry and primary production of boreal marshes in northern Manitoba, Canada. [Internet] [Masters thesis]. University of Manitoba; 2011. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1993/4399.

Council of Science Editors:

Watchorn KE. Effects of water level management on water chemistry and primary production of boreal marshes in northern Manitoba, Canada. [Masters Thesis]. University of Manitoba; 2011. Available from: http://hdl.handle.net/1993/4399

Grand Valley State University

19. Knapp, Katie Lynn. Dynamic Carbon Cycling in Muskegon Lake – a Great Lakes Estuary.

Degree: 2019, Grand Valley State University

URL: https://scholarworks.gvsu.edu/theses/947

► Ecosystem metabolism is the coupling of carbon and oxygen through photosynthesis and respiration. Gross primary production (GPP) is the carbon fixation by photosynthesis, ecosystem respiration… (more)

Subjects/Keywords: metabolism; primary production; respiration; Muskegon Lake; Biology; Terrestrial and Aquatic Ecology

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APA (6^th Edition):

Knapp, K. L. (2019). Dynamic Carbon Cycling in Muskegon Lake – a Great Lakes Estuary. (Thesis). Grand Valley State University. Retrieved from https://scholarworks.gvsu.edu/theses/947

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Knapp, Katie Lynn. “Dynamic Carbon Cycling in Muskegon Lake – a Great Lakes Estuary.” 2019. Thesis, Grand Valley State University. Accessed January 17, 2021. https://scholarworks.gvsu.edu/theses/947.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Knapp, Katie Lynn. “Dynamic Carbon Cycling in Muskegon Lake – a Great Lakes Estuary.” 2019. Web. 17 Jan 2021.

Vancouver:

Knapp KL. Dynamic Carbon Cycling in Muskegon Lake – a Great Lakes Estuary. [Internet] [Thesis]. Grand Valley State University; 2019. [cited 2021 Jan 17]. Available from: https://scholarworks.gvsu.edu/theses/947.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Knapp KL. Dynamic Carbon Cycling in Muskegon Lake – a Great Lakes Estuary. [Thesis]. Grand Valley State University; 2019. Available from: https://scholarworks.gvsu.edu/theses/947

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New Mexico

20. Scholle, Steven Daniel. Effects of stream edges on algal biomass in the middle Rio Grande.

Degree: UNM Biology Department, 2015, University of New Mexico

URL: https://digitalrepository.unm.edu/biol_etds/101

► In river systems, there are many factors that impede or facilitate algal standing stock and therefore impact primary production in these environments. I am particularly… (more)

▼ In river systems, there are many factors that impede or facilitate algal standing stock and therefore impact primary production in these environments. I am particularly interested in the influence of edges in riverine systems and how these geomorphic features affect the available surface area for algal production. This study investigates the middle Rio Grande system near Albuquerque, New Mexico, USA. The middle Rio Grande is a turbid, partially braided lotic ecosystem. Although edge characteristics can vary widely, especially between errosional and depositional banks, I hypothesize that edges become important zones of primary production, due in part to decreased water depth, providing increased light availability. Further, edges may provide regions of lower flow velocity, resulting in reduced substrate turnover and increased nutrient retention, facilitating algal attachment and growth. This study aims to elucidate the relationships among position within a transect (i.e. distance from edge), substrate type (i.e. sand, mud, cobble), water chemistry, turbidity, depth, flow velocity, and algal biomass. I use the analysis of chlorophyll a (chl a) concentrations as a proxy for algal biomass in samples taken across lateral transects, each with a different predominant benthic substrate. This work develops the understanding of key contributing abiotic factors that influence primary production in the middle Rio Grande and similar ecosystems by providing insight into the effects of these factors on chl a concentrations. Surprisingly, only transects with the sand substrate exhibited my hypothesized pattern of greater primary production near river edges. In contrast, the transects with cobble and mud substrates show the opposite pattern, in which locations far from the rivers edge contained the highest algal concentrations. These results highlight the complex interactions of abiotic influences on benthic primary production in these systems. Advisors/Committee Members: Turner, Thomas, Bixby, Rebecca, Sinsabaugh, Robert, Meyer, Grant.

Subjects/Keywords: Rio Grande; algae; edges; primary production; fluvial geomorphology; lotic ecosystem

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APA (6^th Edition):

Scholle, S. D. (2015). Effects of stream edges on algal biomass in the middle Rio Grande. (Masters Thesis). University of New Mexico. Retrieved from https://digitalrepository.unm.edu/biol_etds/101

Chicago Manual of Style (16^th Edition):

Scholle, Steven Daniel. “Effects of stream edges on algal biomass in the middle Rio Grande.” 2015. Masters Thesis, University of New Mexico. Accessed January 17, 2021. https://digitalrepository.unm.edu/biol_etds/101.

MLA Handbook (7^th Edition):

Scholle, Steven Daniel. “Effects of stream edges on algal biomass in the middle Rio Grande.” 2015. Web. 17 Jan 2021.

Vancouver:

Scholle SD. Effects of stream edges on algal biomass in the middle Rio Grande. [Internet] [Masters thesis]. University of New Mexico; 2015. [cited 2021 Jan 17]. Available from: https://digitalrepository.unm.edu/biol_etds/101.

Council of Science Editors:

Scholle SD. Effects of stream edges on algal biomass in the middle Rio Grande. [Masters Thesis]. University of New Mexico; 2015. Available from: https://digitalrepository.unm.edu/biol_etds/101

University of Manitoba

21. Back, DongYoung. On the effects of wastewater effluent on local primary production near a Canadian Arctic coastal community.

Degree: Environment and Geography, 2020, University of Manitoba

URL: http://hdl.handle.net/1993/34636

► The Arctic Ocean is experiencing large and small changes throughout the region caused by climate-induced change. Furthermore, increases in human activity and population have been… (more)

▼ The Arctic Ocean is experiencing large and small changes throughout the region caused by climate-induced change. Furthermore, increases in human activity and population have been observed throughout the Arctic, leading to an increase in wastewater production within coastal Arctic communities. Wastewater contains high concentrations of nitrogen compounds that are released during summer into coastal seas, via natural purification systems such as lagoons and wetlands, where it can stimulate marine algal production. My thesis research investigated the effect of this anthropogenic nitrogen input on phytoplankton near an Arctic coastal community in the Canadian Arctic Archipelago, namely Cambridge Bay, Nunavut. During discharge, a phytoplankton bloom was triggered by the presence of high nitrogen compounds in the effluent, which influenced both taxonomic composition and production of the phytoplankton community. Before wastewater discharge, flagellate species were dominant in the phytoplankton community, characteristic of the original oligotrophic conditions for the region. However, after discharge commenced, diatom rapidly became the dominant taxa of the bloom. The increase in diatoms was also believed to influence bloom progression as the diatoms were dense enough to sink below a persistent pycnocline and use accumulated nutrients available at depth in the system. A comparison of observations before and after wastewater discharge versus those during shows that the average primary production increased by about 170 mg C m-2 d-1 during discharge. This increase over a 4-week period equated to 68% of total open water primary production from 9 July to 10 October, 2018. Although the local system was not deemed eutrophic, a persistent pycnocline and bounding shallow sills for the local bay create a unique situation that acts to trap wastewater nitrogen compounds at depth. Such a system can lead to increasing stores of nutrients over time if not regularly ventilated. Therefore, strong recommendations are made for future monitoring and research. Advisors/Committee Members: Mundy, C.J. (Environment and Geography) (supervisor), Hanson, Mark (Environment and Geography) (examiningcommittee), Cicek, Nazim (Biosystems Engineering) (examiningcommittee).

Subjects/Keywords: Phytoplankon; the Arctic Ocean; Primary Production; Wastewater Effluent; nutrients

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APA (6^th Edition):

Back, D. (2020). On the effects of wastewater effluent on local primary production near a Canadian Arctic coastal community. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/34636

Chicago Manual of Style (16^th Edition):

Back, DongYoung. “On the effects of wastewater effluent on local primary production near a Canadian Arctic coastal community.” 2020. Masters Thesis, University of Manitoba. Accessed January 17, 2021. http://hdl.handle.net/1993/34636.

MLA Handbook (7^th Edition):

Back, DongYoung. “On the effects of wastewater effluent on local primary production near a Canadian Arctic coastal community.” 2020. Web. 17 Jan 2021.

Vancouver:

Back D. On the effects of wastewater effluent on local primary production near a Canadian Arctic coastal community. [Internet] [Masters thesis]. University of Manitoba; 2020. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1993/34636.

Council of Science Editors:

Back D. On the effects of wastewater effluent on local primary production near a Canadian Arctic coastal community. [Masters Thesis]. University of Manitoba; 2020. Available from: http://hdl.handle.net/1993/34636

University of Maryland

22. Ziombra, Katherine Elizabeth Davis. EVALUATION OF THE INFLUENCE OF NITROGEN ON PRIMARY PRODUCTION USING RETROSPECTIVE DATA, REGRESSION ANALYSIS, AND MODELING.

Degree: Marine-Estuarine-Environmental Sciences, 2012, University of Maryland

URL: http://hdl.handle.net/1903/12549

► Anthropogenic activities have negatively affected water quality in the Chesapeake Bay and its tributaries. The Potomac River (PR), the largest tributary, is a primary study… (more)

Subjects/Keywords: Environmental science; Ecology; models; nitrogen; Potomac; primary production; regression

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APA (6^th Edition):

Ziombra, K. E. D. (2012). EVALUATION OF THE INFLUENCE OF NITROGEN ON PRIMARY PRODUCTION USING RETROSPECTIVE DATA, REGRESSION ANALYSIS, AND MODELING. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/12549

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ziombra, Katherine Elizabeth Davis. “EVALUATION OF THE INFLUENCE OF NITROGEN ON PRIMARY PRODUCTION USING RETROSPECTIVE DATA, REGRESSION ANALYSIS, AND MODELING.” 2012. Thesis, University of Maryland. Accessed January 17, 2021. http://hdl.handle.net/1903/12549.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ziombra, Katherine Elizabeth Davis. “EVALUATION OF THE INFLUENCE OF NITROGEN ON PRIMARY PRODUCTION USING RETROSPECTIVE DATA, REGRESSION ANALYSIS, AND MODELING.” 2012. Web. 17 Jan 2021.

Vancouver:

Ziombra KED. EVALUATION OF THE INFLUENCE OF NITROGEN ON PRIMARY PRODUCTION USING RETROSPECTIVE DATA, REGRESSION ANALYSIS, AND MODELING. [Internet] [Thesis]. University of Maryland; 2012. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1903/12549.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ziombra KED. EVALUATION OF THE INFLUENCE OF NITROGEN ON PRIMARY PRODUCTION USING RETROSPECTIVE DATA, REGRESSION ANALYSIS, AND MODELING. [Thesis]. University of Maryland; 2012. Available from: http://hdl.handle.net/1903/12549

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Georgia

23. Velasquez, Liliana Eugenia. Benthic primary production in coastal salt marsh systems.

Degree: 2014, University of Georgia

URL: http://hdl.handle.net/10724/22537

► Benthic microalgae are a central component of shallow coastal habitats and they may account for a significant fraction of the total primary production in these… (more)

Subjects/Keywords: Benthic Microalgae; Primary Production; Biomass; Duplin River; Satilla River; Nutrient Addition

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APA (6^th Edition):

Velasquez, L. E. (2014). Benthic primary production in coastal salt marsh systems. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/22537

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Velasquez, Liliana Eugenia. “Benthic primary production in coastal salt marsh systems.” 2014. Thesis, University of Georgia. Accessed January 17, 2021. http://hdl.handle.net/10724/22537.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Velasquez, Liliana Eugenia. “Benthic primary production in coastal salt marsh systems.” 2014. Web. 17 Jan 2021.

Vancouver:

Velasquez LE. Benthic primary production in coastal salt marsh systems. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10724/22537.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Velasquez LE. Benthic primary production in coastal salt marsh systems. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/22537

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Montana Tech

24. He, Mingzhu. RESPONSES OF TERRESTRIAL CARBON AND WATER FLUX TO CLIMATE VARIABILITY: REMOTE SENSING DRIVEN ANALYSIS OF GROSS PRIMARY PRODUCTION AND EVAPOTRANSPIRATION.

Degree: PhD, 2018, Montana Tech

URL: https://scholarworks.umt.edu/etd/11284

► Accurate estimations of terrestrial carbon uptake (Gross Primary Production, GPP) and water loss (Evapotranspiration, ET) are crucial for understanding the response of ecosystems to… (more)

Subjects/Keywords: Agriculture; Evapotranspiration; Gross primary production; Landsat; Light use efficiency; MODIS

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APA (6^th Edition):

He, M. (2018). RESPONSES OF TERRESTRIAL CARBON AND WATER FLUX TO CLIMATE VARIABILITY: REMOTE SENSING DRIVEN ANALYSIS OF GROSS PRIMARY PRODUCTION AND EVAPOTRANSPIRATION. (Doctoral Dissertation). Montana Tech. Retrieved from https://scholarworks.umt.edu/etd/11284

Chicago Manual of Style (16^th Edition):

He, Mingzhu. “RESPONSES OF TERRESTRIAL CARBON AND WATER FLUX TO CLIMATE VARIABILITY: REMOTE SENSING DRIVEN ANALYSIS OF GROSS PRIMARY PRODUCTION AND EVAPOTRANSPIRATION.” 2018. Doctoral Dissertation, Montana Tech. Accessed January 17, 2021. https://scholarworks.umt.edu/etd/11284.

MLA Handbook (7^th Edition):

He, Mingzhu. “RESPONSES OF TERRESTRIAL CARBON AND WATER FLUX TO CLIMATE VARIABILITY: REMOTE SENSING DRIVEN ANALYSIS OF GROSS PRIMARY PRODUCTION AND EVAPOTRANSPIRATION.” 2018. Web. 17 Jan 2021.

Vancouver:

He M. RESPONSES OF TERRESTRIAL CARBON AND WATER FLUX TO CLIMATE VARIABILITY: REMOTE SENSING DRIVEN ANALYSIS OF GROSS PRIMARY PRODUCTION AND EVAPOTRANSPIRATION. [Internet] [Doctoral dissertation]. Montana Tech; 2018. [cited 2021 Jan 17]. Available from: https://scholarworks.umt.edu/etd/11284.

Council of Science Editors:

He M. RESPONSES OF TERRESTRIAL CARBON AND WATER FLUX TO CLIMATE VARIABILITY: REMOTE SENSING DRIVEN ANALYSIS OF GROSS PRIMARY PRODUCTION AND EVAPOTRANSPIRATION. [Doctoral Dissertation]. Montana Tech; 2018. Available from: https://scholarworks.umt.edu/etd/11284

University of Montana

25. Moreno, Adam LaSalle. Future potential net primary production trends of contiguous United States rangelands.

Degree: MS, 2011, University of Montana

URL: https://scholarworks.umt.edu/etd/476

► Rangelands are an important ecosystem covering nearly 24% of the earth’s terrestrial vegetation. Climate change is predicted to affect many of the factors that influence… (more)

Subjects/Keywords: climate change; future; net primary production; npp; rangeland; trends; united states

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APA (6^th Edition):

Moreno, A. L. (2011). Future potential net primary production trends of contiguous United States rangelands. (Masters Thesis). University of Montana. Retrieved from https://scholarworks.umt.edu/etd/476

Chicago Manual of Style (16^th Edition):

Moreno, Adam LaSalle. “Future potential net primary production trends of contiguous United States rangelands.” 2011. Masters Thesis, University of Montana. Accessed January 17, 2021. https://scholarworks.umt.edu/etd/476.

MLA Handbook (7^th Edition):

Moreno, Adam LaSalle. “Future potential net primary production trends of contiguous United States rangelands.” 2011. Web. 17 Jan 2021.

Vancouver:

Moreno AL. Future potential net primary production trends of contiguous United States rangelands. [Internet] [Masters thesis]. University of Montana; 2011. [cited 2021 Jan 17]. Available from: https://scholarworks.umt.edu/etd/476.

Council of Science Editors:

Moreno AL. Future potential net primary production trends of contiguous United States rangelands. [Masters Thesis]. University of Montana; 2011. Available from: https://scholarworks.umt.edu/etd/476

University of British Columbia

26. Ngai, Jacqueline. Trophic effects on nutrient cycling.

Degree: PhD, Zoology, 2008, University of British Columbia

URL: http://hdl.handle.net/2429/2851

► The top-down effects of consumers and bottom-up effects of resource availability are important in determining community structure and ecological processes. I experimentally examined the roles… (more)

▼ The top-down effects of consumers and bottom-up effects of resource availability are important in determining community structure and ecological processes. I experimentally examined the roles of consumers — both detritivores and predators — and habitat context in affecting nutrient cycling using the detritus-based insect community in bromeliad leaf wells. I also investigated the role of multiple resources in limiting plant productivity using meta analyses. The insect community in bromeliads only increased nitrogen release from leaf detritus in the presence of a predator trophic level. When only detritivores were present, the flow of stable isotope-labeled nitrogen from detritus to bromeliads was statistically indistinguishable from that in bromeliads lacking insects. I suggest that emergence of adult detritivores constitutes a loss of nitrogen from bromeliad ecosystems, and that predation reduces the rate of this nutrient loss. Hence, insects facilitate nutrient uptake by the plant, but only if both predators and detritivores are present. Moreover, predators can affect nutrient cycling by influencing the spatial scale of prey turnover. This mechanism results in a pattern opposite to that predicted by classic trophic cascade theory. Increasing habitat complexity can have implications for nutrient cycling by decreasing the foraging efficiency of both predators and their prey, and by affecting the vulnerability of predators to intraguild predation. Along a natural gradient in bromeliad size, I found that, depending on the relationship between community composition and habitat size, habitat complexity interacts with the changing biotic community to either complement or counteract the impact of predators on nutrient uptake by bromeliads. In contrast to the existing emphasis on single-resource limitation of primary productivity, meta-analyses of a database of 653 studies revealed widespread limitation by multiple resources, and frequent interaction between these resources in restricting plant growth. A framework for analyzing fertilization studies is outlined, with explicit consideration of the possible role of multiple resources. I also review a range of mechanisms responsible for the various forms of resource limitation that are observed in fertilization experiments. These studies emphasize that a wider range of predator and nutrient impacts should be considered, beyond the paradigm of single resource limitation or classic trophic cascades.

Subjects/Keywords: Predators; Nitrogen; Primary production; Phosphorus

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APA (6^th Edition):

Ngai, J. (2008). Trophic effects on nutrient cycling. (Doctoral Dissertation). University of British Columbia. Retrieved from http://hdl.handle.net/2429/2851

Chicago Manual of Style (16^th Edition):

Ngai, Jacqueline. “Trophic effects on nutrient cycling.” 2008. Doctoral Dissertation, University of British Columbia. Accessed January 17, 2021. http://hdl.handle.net/2429/2851.

MLA Handbook (7^th Edition):

Ngai, Jacqueline. “Trophic effects on nutrient cycling.” 2008. Web. 17 Jan 2021.

Vancouver:

Ngai J. Trophic effects on nutrient cycling. [Internet] [Doctoral dissertation]. University of British Columbia; 2008. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/2429/2851.

Council of Science Editors:

Ngai J. Trophic effects on nutrient cycling. [Doctoral Dissertation]. University of British Columbia; 2008. Available from: http://hdl.handle.net/2429/2851

University of Sydney

27. Finlay, Robert Andrew. Primary producer perspectives on rural land management in central and western NSW .

Degree: 2014, University of Sydney

URL: http://hdl.handle.net/2123/10312

► In light of the on-going environmental challenges being faced by managers of Australia’s rural and remote landscapes it has become apparent that change will occur… (more)

Subjects/Keywords: Farmers; Land management; Attitudes; Personality; Sustainability; Primary production

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APA (6^th Edition):

Finlay, R. A. (2014). Primary producer perspectives on rural land management in central and western NSW . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/10312

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Finlay, Robert Andrew. “Primary producer perspectives on rural land management in central and western NSW .” 2014. Thesis, University of Sydney. Accessed January 17, 2021. http://hdl.handle.net/2123/10312.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Finlay, Robert Andrew. “Primary producer perspectives on rural land management in central and western NSW .” 2014. Web. 17 Jan 2021.

Vancouver:

Finlay RA. Primary producer perspectives on rural land management in central and western NSW . [Internet] [Thesis]. University of Sydney; 2014. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/2123/10312.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Finlay RA. Primary producer perspectives on rural land management in central and western NSW . [Thesis]. University of Sydney; 2014. Available from: http://hdl.handle.net/2123/10312

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Oklahoma

28. Zhang, Yao. DIAGNOSTIC ANALYSIS OF TERRESTRIAL GROSS PRIMARY PRODUCTIVITY USING REMOTE SENSING AND IN SITU OBSERVATIONS.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/52420

► Vegetation play a critical role in the interactions between atmosphere and biosphere. CO2 fixed by plants through photosynthesis process at ecosystem scale is termed as… (more)

▼ Vegetation play a critical role in the interactions between atmosphere and biosphere. CO2 fixed by plants through photosynthesis process at ecosystem scale is termed as gross primary production (GPP). It is also the first step CO2 entering the biosphere from the atmosphere. It not only fuels the ecosystem functioning, but also drives the global carbon cycle. Accurate estimation of the ecosystem photosynthetic carbon uptake at a global scale can help us better understand the global carbon budget, and the ecosystem sensitivity to the global climate change. Satellite observations have the advantage of global coverage and high revisit cycle, hence, are ideal for global GPP estimation. The simple production efficiency model that utilize the remote sensing imagery and climate data can provide reasonably well estimates of GPP at a global scale. With the solar induced chlorophyll fluorescence (SIF) being retrieved from satellite observations, new opportunities emerge in directly estimating photosynthesis from the energy absorption and partitioning perspective. In this thesis, by combining observations from both in situ and remotely acquired, I tried to (1) investigate the GPP SIF relationship using data from observations and model simulations; (2) improve a production efficiency model (vegetation photosynthesis model, VPM) and apply it to the regional and global scale; (3) investigate the GPP and SIF sensitivity to drought at different ecosystems; (4) explore the global interannual variation of GPP and its contributing factors. Chapter 2 uses site level observations of both SIF and GPP to explore their linkage at both leaf and canopy/ecosystem scale throughout a growing season. Two drought events happened during this growing season also highlight the advantage of SIF in early drought warning and its close linkage to photosynthetic activity. Chapter 3 compares the GPP and SIF relationships using both instantaneous and daily integrated observations, the daily GPP and satellite retrieved SIF are latitudinal dependent and time-of-overpass dependent. Daily integrated SIF estimation shows better correlation with daily GPP observations. Chapter 4 compares different vegetation indices with SIF to get an empirical estimation of fraction of photosynthetically active radiation by chlorophyll (fPARchl). By comparing this fPARchl estimation with ecosystem light use efficiency retrieved from eddy covariance flux towers, the light use efficiency based on light absorption by chlorophyll shows narrower range of variation that can be used for improving production efficiency models. Chapter 5 investigates the drought impact on GPP through the change of vegetation canopy optical properties and physiological processes. Forest and non-forest ecosystems shows very different responses in terms of these two limitation and need to be treated differently in GPP modelling. Chapter 6 applies the improved VPM to North America and compared with SIF retrieval from GOME-2 instrument. The comparison shows good consistency between GPP and SIF in both spatial… Advisors/Committee Members: Xiao, Xiangming (advisor), Basara, Jeffrey (committee member), McCarthy, Heather (committee member), Souza, Lara (committee member), Hong, Yang (committee member).

Subjects/Keywords: remote sensing; light use efficiency; gross primary production

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

APA (6^th Edition):

Zhang, Y. (2017). DIAGNOSTIC ANALYSIS OF TERRESTRIAL GROSS PRIMARY PRODUCTIVITY USING REMOTE SENSING AND IN SITU OBSERVATIONS. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/52420

Chicago Manual of Style (16^th Edition):

Zhang, Yao. “DIAGNOSTIC ANALYSIS OF TERRESTRIAL GROSS PRIMARY PRODUCTIVITY USING REMOTE SENSING AND IN SITU OBSERVATIONS.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed January 17, 2021. http://hdl.handle.net/11244/52420.

MLA Handbook (7^th Edition):

Zhang, Yao. “DIAGNOSTIC ANALYSIS OF TERRESTRIAL GROSS PRIMARY PRODUCTIVITY USING REMOTE SENSING AND IN SITU OBSERVATIONS.” 2017. Web. 17 Jan 2021.

Vancouver:

Zhang Y. DIAGNOSTIC ANALYSIS OF TERRESTRIAL GROSS PRIMARY PRODUCTIVITY USING REMOTE SENSING AND IN SITU OBSERVATIONS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/11244/52420.

Council of Science Editors:

Zhang Y. DIAGNOSTIC ANALYSIS OF TERRESTRIAL GROSS PRIMARY PRODUCTIVITY USING REMOTE SENSING AND IN SITU OBSERVATIONS. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/52420

University of Kansas

29. Kelly, Michelle Catherine. High supply, high demand: A unique nutrient addition decouples nitrate uptake and metabolism in a large river.

Degree: MA, Ecology & Evolutionary Biology, 2019, University of Kansas

URL: http://hdl.handle.net/1808/30207

► Our current understanding of the relationship between nitrate (NO3-) uptake and energy cycling in rivers is primarily built on studies conducted in low-nutrient (NO3- <… (more)

Subjects/Keywords: Biogeochemistry; Ecology; Limnology; Disturbance; Ecosystem respiration; Nutrient cycling; Primary production; Sensors

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

APA (6^th Edition):

Kelly, M. C. (2019). High supply, high demand: A unique nutrient addition decouples nitrate uptake and metabolism in a large river. (Masters Thesis). University of Kansas. Retrieved from http://hdl.handle.net/1808/30207

Chicago Manual of Style (16^th Edition):

Kelly, Michelle Catherine. “High supply, high demand: A unique nutrient addition decouples nitrate uptake and metabolism in a large river.” 2019. Masters Thesis, University of Kansas. Accessed January 17, 2021. http://hdl.handle.net/1808/30207.

MLA Handbook (7^th Edition):

Kelly, Michelle Catherine. “High supply, high demand: A unique nutrient addition decouples nitrate uptake and metabolism in a large river.” 2019. Web. 17 Jan 2021.

Vancouver:

Kelly MC. High supply, high demand: A unique nutrient addition decouples nitrate uptake and metabolism in a large river. [Internet] [Masters thesis]. University of Kansas; 2019. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1808/30207.

Council of Science Editors:

Kelly MC. High supply, high demand: A unique nutrient addition decouples nitrate uptake and metabolism in a large river. [Masters Thesis]. University of Kansas; 2019. Available from: http://hdl.handle.net/1808/30207

30. Davis, Clinton J. Periphyton Ecology in Great Basin Rivers: Winter Blooms, Hyporheic Exchange Effects, and Reservoir-tailwater Productivity.

Degree: 2012, University of Nevada – Reno

URL: http://hdl.handle.net/11714/3650

► Recent surveys have revealed a preponderance of evidence that strong periphyton-nutrient interactions occur in Great Basin rivers. These initial field efforts have, to some extent,… (more)

▼ Recent surveys have revealed a preponderance of evidence that strong periphyton-nutrient interactions occur in Great Basin rivers. These initial field efforts have, to some extent, determined the occurrence, coverage and magnitude of these periphyton blooms. Localized studies are warranted that focus on quantifying ecologically relevant rates (e.g. accrual, primary production, growth rates) and environmental conditions related to bloom events. Three observational studies were conducted in Great Basin rivers focusing on various spatial and temporal dynamics of periphyton blooms. The first study provides a detailed description of a recurring winter bloom in the Truckee River, CA-NV. Results show that despite near-freezing temperatures and low light, the bloom appears as a result of slow but steady growth that experiences minimal losses for an extended period (>100 days). Further, net ecosystem production during the winter bloom can account for approximately a third of the annual net ecosystem production. The second study is an investigation of the potential influence of vertical hyporheic exchange on periphyton assemblages in the main channel of a montane reach and a desert reach in the Truckee River. No convincing evidence was found that periphyton assemblages were affected by exchange processes at the riffle-pool scale in either reach. A sufficient flux of nutrients from other sources (e.g. water column, N2 fixation, internal cycling within mats) supports balanced periphyton growth.Third, a reservoir-tailwater system in eastern Nevada appears to provide the optimal conditions for periphyton that maximizes areal rates of primary production. Periphyton-nutrient interactions were exceptionally strong due to a combination of reservoir operations and a favorable environmental setting in the semi-arid landscape. Estimated primary production rates ranked among the highest reported for streams worldwide and appeared to be constrained to maximum rates by self-regulating mechanisms. Advisors/Committee Members: Fritsen, Christian H. (advisor), Chandra, Sudeep (committee member), Saito, Laurel (committee member), Baguley, Jeffrey (committee member), Qualls, Robert (committee member).

Subjects/Keywords: algal blooms; Great Basin; metabolism; periphyton; primary production; rivers

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APA (6^th Edition):

Davis, C. J. (2012). Periphyton Ecology in Great Basin Rivers: Winter Blooms, Hyporheic Exchange Effects, and Reservoir-tailwater Productivity. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/3650

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Davis, Clinton J. “Periphyton Ecology in Great Basin Rivers: Winter Blooms, Hyporheic Exchange Effects, and Reservoir-tailwater Productivity.” 2012. Thesis, University of Nevada – Reno. Accessed January 17, 2021. http://hdl.handle.net/11714/3650.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Davis, Clinton J. “Periphyton Ecology in Great Basin Rivers: Winter Blooms, Hyporheic Exchange Effects, and Reservoir-tailwater Productivity.” 2012. Web. 17 Jan 2021.

Vancouver:

Davis CJ. Periphyton Ecology in Great Basin Rivers: Winter Blooms, Hyporheic Exchange Effects, and Reservoir-tailwater Productivity. [Internet] [Thesis]. University of Nevada – Reno; 2012. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/11714/3650.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Davis CJ. Periphyton Ecology in Great Basin Rivers: Winter Blooms, Hyporheic Exchange Effects, and Reservoir-tailwater Productivity. [Thesis]. University of Nevada – Reno; 2012. Available from: http://hdl.handle.net/11714/3650

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations