You searched for subject:(Harmful Algae).
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Texas A&M University
1.
Cagle, Sierra Elena.
An Investigation into How Mixotrophy and Deleterious Chemical Production Give Harmful Algae a Competitive Advantage in Systems Influenced by Anthropogenic Disturbance.
Degree: PhD, Wildlife and Fisheries Sciences, 2019, Texas A&M University
URL: http://hdl.handle.net/1969.1/188712 
► Harmful algae blooms (HABs)are an increasing problem world-wide. The increasing occurrence and magnitude of HABs has often been linked to anthropogenic disturbances, some of which…
(more)
▼ Harmful algae blooms (HABs)are an increasing problem world-wide. The increasing occurrence and magnitude of HABs has often been linked to anthropogenic disturbances, some of which include salinization, nutrient ratios skewed away from the Redfield ratio, and increased nutrient loading. The research presented here contributes to the impressive pre-existing collection of studies focusing on the HAB problem. In Chapter 1, it is shown that co-occurring disturbances can have synergistic effects on a mixotrophic HAB species, Prymnesium parvum. It was found that increased salinity, community composition change via removal of large zooplankton, and elevated P. parvum propagule pressure interact to influence the abundance of P. parvum cells, and that the effect is dependent on system specific salinity history. When P. parvum was inoculated into a plankton community at low density it increased most if zooplankton were removed and salinity was elevated. In Chapter 2, it was demonstrated that when the nitrogen to phosphorous ratio was skewed away from the Redfield ratio allelochemicals produced by P. parvum had acute mass mortality effects on multiple trophic levels. But, when nutrients were supplied at the Redfield ratio allelochemicals were ineffective and cell-to-organism contact was required for deleterious effects to occur. Importantly, only when the P. parvum population was at high densities did it appear to have negative effects on other organisms, suggesting that mass effects of allelochemicals may not contribute to bloom initiation.
In Chapter 3, it was demonstrated that flexible nutrition could lead to population persistence of an otherwise non-competitive theoretical phytoplankton species, but only when the species was highly inedible to zooplankton grazers. Additionally, it was shown that as nutrient loading was increased, system stability decreased via the initiation of zooplankton- phytoplankton boom-bust cycles. However, the presence of a mixotrophic population stabilized the system by reducing the number of cycles that occurred. Notably, when nutrient loading was elevated community dynamics became complex and the mixotroph population density was unpredictable from year to year, sometimes reaching high densities. This finding demonstrates how a bloom of a mixotroph can get started with enrichment when no role of toxins is considered.
Advisors/Committee Members: Roelke, Daniel L (advisor), Armitage, Anna R (committee member), Fujiwara, Masami (committee member), Winemiller, Kirk O (committee member).
Subjects/Keywords: plankton ecology; harmful algae
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APA (6th Edition):
Cagle, S. E. (2019). An Investigation into How Mixotrophy and Deleterious Chemical Production Give Harmful Algae a Competitive Advantage in Systems Influenced by Anthropogenic Disturbance. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/188712
Chicago Manual of Style (16th Edition):
Cagle, Sierra Elena. “An Investigation into How Mixotrophy and Deleterious Chemical Production Give Harmful Algae a Competitive Advantage in Systems Influenced by Anthropogenic Disturbance.” 2019. Doctoral Dissertation, Texas A&M University. Accessed January 24, 2021.
http://hdl.handle.net/1969.1/188712.
MLA Handbook (7th Edition):
Cagle, Sierra Elena. “An Investigation into How Mixotrophy and Deleterious Chemical Production Give Harmful Algae a Competitive Advantage in Systems Influenced by Anthropogenic Disturbance.” 2019. Web. 24 Jan 2021.
Vancouver:
Cagle SE. An Investigation into How Mixotrophy and Deleterious Chemical Production Give Harmful Algae a Competitive Advantage in Systems Influenced by Anthropogenic Disturbance. [Internet] [Doctoral dissertation]. Texas A&M University; 2019. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/1969.1/188712.
Council of Science Editors:
Cagle SE. An Investigation into How Mixotrophy and Deleterious Chemical Production Give Harmful Algae a Competitive Advantage in Systems Influenced by Anthropogenic Disturbance. [Doctoral Dissertation]. Texas A&M University; 2019. Available from: http://hdl.handle.net/1969.1/188712
Texas A&M University
2.
Davis, Stephen Louis.
Beyond the Edge of a Niche: The Role of Grazing on Prymnesium parvum Bloom Formations in Two Texas Lakes.
Degree: MS, Water Management and Hydrological Science, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/152589
► Prymnesium parvum (golden algae) is a harmful algal bloom species that has caused tens of millions of dollars in natural resource damages in Texas as…
(more)
▼ Prymnesium parvum (golden
algae) is a
harmful algal bloom species that has caused tens of millions of dollars in natural resource damages in Texas as a result of massive fish kills. This species is present in many Texas lakes, but does not form blooms in all of them. Previous literature has suggested that predation, specifically by rotifers, may be an important loss factor to P. parvum populations. This research is focused on investigating whether grazing by rotifers is a significant factor in the prevention of blooms in some lakes. Three-day in-lake mesocosm experiments were conducted during times of bloom initiation and bloom development in two Texas lakes (Whitney and Somerville) where the former experiences P. parvum blooms and the latter does not. Controls and treatments consisted of P. parvum cultures in log- and stationary-growth phases, natural phytoplankton assemblages, and natural rotifer assemblages from each lake. Monitored parameters included P. parvum population density and population growth rate, toxicity, chlorophyll-a, and zooplankton biovolume.
Findings reveal that rotifers in Lake Somerville preferentially grazed P. parvum of all growth phases, while experiencing no negative effects from exposure. Some rotifers even exhibited trends of positive effects from exposure. The mesocosm experiments confirmed that rotifer assemblages in Lake Somerville effectively graze P. parvum with no observed negative effects. These findings support the theory that grazing of P. parvum by rotifers is an important contributing factor preventing blooms in Lake Somerville. On the other hand, rotifers from the winter Lake Whitney experiment appeared to preferentially graze P. parvum populations inoculated from log-growth phase culture while significant reductions in rotifer biovolume were observed. P. parvum inoculated from stationary-growth phase culture were not significantly grazed, nor were other phytoplankton within the treatment suggesting that sub-lethal toxic effects from ingestion of stationary phase cells caused a decrease in zooplankton metabolic rates. These lake-specific relationships between P. parvum and rotifers may have been due to microevolutionary adaptation. For example, variation in biovolume responses of rotifers to P. parvum exposure between lakes is a result of rapid microevolutionary adaptation from constant low-level toxin exposure in Lake Somerville as a function of salinity.
Advisors/Committee Members: Roelke, Daniel (advisor), Aitkenhead-Peterson, Jacqui (committee member), Winemiller, Kirk (committee member).
Subjects/Keywords: Prymnesium parvum; golden algae; harmful algal bloom
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APA (6th Edition):
Davis, S. L. (2014). Beyond the Edge of a Niche: The Role of Grazing on Prymnesium parvum Bloom Formations in Two Texas Lakes. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152589
Chicago Manual of Style (16th Edition):
Davis, Stephen Louis. “Beyond the Edge of a Niche: The Role of Grazing on Prymnesium parvum Bloom Formations in Two Texas Lakes.” 2014. Masters Thesis, Texas A&M University. Accessed January 24, 2021.
http://hdl.handle.net/1969.1/152589.
MLA Handbook (7th Edition):
Davis, Stephen Louis. “Beyond the Edge of a Niche: The Role of Grazing on Prymnesium parvum Bloom Formations in Two Texas Lakes.” 2014. Web. 24 Jan 2021.
Vancouver:
Davis SL. Beyond the Edge of a Niche: The Role of Grazing on Prymnesium parvum Bloom Formations in Two Texas Lakes. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/1969.1/152589.
Council of Science Editors:
Davis SL. Beyond the Edge of a Niche: The Role of Grazing on Prymnesium parvum Bloom Formations in Two Texas Lakes. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152589
King Abdullah University of Science and Technology
3.
Aynousah, Arwa.
Thermal Responses of Growth and Toxin Production in Four Prorocentrum Species from the Central Red Sea.
Degree: 2017, King Abdullah University of Science and Technology
URL: http://hdl.handle.net/10754/625126
► Harmful algae studies, in particular toxic dinoflagellates, and their response to global warming in the Red Sea are still limited. This study was aimed to…
(more)
▼ Harmful algae studies, in particular toxic dinoflagellates, and their response to global warming in the Red Sea are still limited. This study was aimed to be the first to characterize the identity, thermal responses and toxin production of four Prorocentrum strains isolated from the Central Red Sea, Saudi Arabia. Morphological and molecular phylogenetic analysis identified the strains as P. elegans, P. rhathymum and P. emarginatum. However, the identity of strain P. sp.6 is currently unresolved, albeit sharing close affinity with P. leve. Growth experiments showed that all species could grow at 24-32°C, but only P. sp.6 survived the 34°C treatment. The optimum temperatures (Topt) estimated from the Gaussian model corresponded to 27.17, 29.33, 26.87, and 27.64°C for P. sp.6, P. elegans, P. rhathymum and P. emarginatum, respectively. However, some discrepancy with the Topt derived from the growth performance were observed for P. elegans and P. emarginatum, as thermal responses differed from the typical Gaussian fit. The Prorocentrum species examined showed a sharp decrease after the optimum temperature resulting in very high activation energies for the fall slope, especially for P. elegans and P. emarginatum. The minimum critical temperature limit for growth was not detected within the range of temperatures examined. Subsequently, high performance liquid chromatography coupled with mass spectrometry (HPLC-MS) analysis revealed all species as non okadaic acid (OA, common toxin of the Prorocentrum genus) producers at any temperature treatment. However, other forms of toxin (i.e. fast acting toxins) not examined here could be produced. Therefore, further investigations are required. The results of this study provided significant contribution to our knowledge regarding the presence, thermal response and toxin production of four Prorocentrum species from the Central Red Sea, Saudi Arabia.
Subjects/Keywords: Prorocentrum; Harmful algae; Dinoflagellates; Okadaic Acid
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APA (6th Edition):
Aynousah, A. (2017). Thermal Responses of Growth and Toxin Production in Four Prorocentrum Species from the Central Red Sea. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/625126
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Aynousah, Arwa. “Thermal Responses of Growth and Toxin Production in Four Prorocentrum Species from the Central Red Sea.” 2017. Thesis, King Abdullah University of Science and Technology. Accessed January 24, 2021.
http://hdl.handle.net/10754/625126.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Aynousah, Arwa. “Thermal Responses of Growth and Toxin Production in Four Prorocentrum Species from the Central Red Sea.” 2017. Web. 24 Jan 2021.
Vancouver:
Aynousah A. Thermal Responses of Growth and Toxin Production in Four Prorocentrum Species from the Central Red Sea. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2017. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10754/625126.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Aynousah A. Thermal Responses of Growth and Toxin Production in Four Prorocentrum Species from the Central Red Sea. [Thesis]. King Abdullah University of Science and Technology; 2017. Available from: http://hdl.handle.net/10754/625126
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Vermont
4.
Del Rossi, Gemma L.
To what extent do psychological distance and knowledge mediate the impact of algae blooms on cultural ecosystem services in the Lake Champlain Basin?.
Degree: The Environmental Program, 2018, University of Vermont
URL: https://scholarworks.uvm.edu/hcoltheses/277
► This research examines the relationships between psychological distance and knowledge of blue green algae on cultural ecosystem services with the hope of understanding how…
(more)
▼ This research examines the relationships between psychological distance and knowledge of blue green
algae on cultural ecosystem services with the hope of understanding how to better incorporate these values into managing the issue of
harmful blue-green
algae blooms within Lake Champlain. A questionnaire was developed and conducted to characterize the relationships between the three concepts. I hypothesized there would be a significant relationship between both
people’s knowledge of
algae blooms, their psychological distance from
algae blooms, and the corresponding impact on cultural ecosystem services from Lake Champlain. In order to test this hypothesis, a mediation model was created and run to determine the relationship between the three variables. Although there was a significant relationship between psychological distance and CES, knowledge of blue-green
algae blooms failed to significantly mediate the primary relationship, with the exceptions of the Bequest and Heritage variables. By understanding these relationships, one can better frame the tradeoff between valuable ecosystem services and environmental degradation in decision-making. Additionally, applying the concept of psychological distance to cultural ecosystem services can motivate individuals to take action against the collective problem of phosphorus management within the Lake Champlain Basin.
Advisors/Committee Members: Dr. Rachelle Gould, RSENR, Dr. Brendan Fisher, RSENR, Kelly Hamshaw, CDAE.
Subjects/Keywords: Cultural ecosystem services; psychological distance; blue-green algae; knowledge; harmful algae blooms; mediation model
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APA (6th Edition):
Del Rossi, G. L. (2018). To what extent do psychological distance and knowledge mediate the impact of algae blooms on cultural ecosystem services in the Lake Champlain Basin?. (Thesis). University of Vermont. Retrieved from https://scholarworks.uvm.edu/hcoltheses/277
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Del Rossi, Gemma L. “To what extent do psychological distance and knowledge mediate the impact of algae blooms on cultural ecosystem services in the Lake Champlain Basin?.” 2018. Thesis, University of Vermont. Accessed January 24, 2021.
https://scholarworks.uvm.edu/hcoltheses/277.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Del Rossi, Gemma L. “To what extent do psychological distance and knowledge mediate the impact of algae blooms on cultural ecosystem services in the Lake Champlain Basin?.” 2018. Web. 24 Jan 2021.
Vancouver:
Del Rossi GL. To what extent do psychological distance and knowledge mediate the impact of algae blooms on cultural ecosystem services in the Lake Champlain Basin?. [Internet] [Thesis]. University of Vermont; 2018. [cited 2021 Jan 24].
Available from: https://scholarworks.uvm.edu/hcoltheses/277.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Del Rossi GL. To what extent do psychological distance and knowledge mediate the impact of algae blooms on cultural ecosystem services in the Lake Champlain Basin?. [Thesis]. University of Vermont; 2018. Available from: https://scholarworks.uvm.edu/hcoltheses/277
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rochester Institute of Technology
5.
McNamara, Shari J.
Using multispectral sensor WASP-Lite to analyze harmful algal blooms.
Degree: Chester F. Carlson Center for Imaging Science (COS), 2007, Rochester Institute of Technology
URL: https://scholarworks.rit.edu/theses/2901
► Developing methods to monitor harmful algae is a current research “hot-topic.” One type of algae, the blue-green algae or Cyanobacteria, cause blooms that can lead…
(more)
▼ Developing methods to monitor
harmful algae is a current research “hot-topic.” One type of
algae, the blue-green
algae or Cyanobacteria, cause blooms that can lead to a health threat to humans and animals. This research will test the use of a cost effective and temporally efficient method using multispectral remote sensing system, WASPLITE, as a monitor of algal blooms. This airborne system will be optimized to the specific application of detecting Cyanobacteria on optically complex waters. Attempts have been made in the past using existing instruments, e.g., SeaWiFS and Landsat, to provide these data, but our solution can provide more information by using optimally selected bands with very high spatial resolution. To analyze these algal blooms, standard multispectral techniques (such as band ratio, spectral curvature and principal component analysis) were used on the airborne data. These results were compared with ground truth collected concurrently with the airborne over flight.
Because of the very high spatial resolution of the system, (0.7 m), compared to many commonly used satellite systems (~30m to 1km), it could be seen that the patchiness of the
algae was very high. Difficulties in applying the ground truth were both technical shortcomings and were due to the nature of the algal blooms. Technical issues include the time lag between the ground sample collect and the airborne collect (the water and
algae move with time), the drift of the boat during ground sampling (there was no anchor), and the error in the GPS units in both the boat and the plane. The issues due to the nature of water and
algae include, sun glint in the imagery, white foam lines created by waves and wind, and most importantly, the patchiness of the
algae in the water. Because the ground truth of one sample point per location was not adequate, we could not correlate the ground truth to the imagery. Qualitatively, the images did show a large variation of
algae concentration in the water through the principal component analysis. Further, flow-through data from another vessel taken from the same week this research was performed, suggests that the variation that is seen in the imagery is real. Overall, this research shows the difficulties in effectively and accurately performing ground truth measurements to be used to test algorithms and methods that are applied to detecting
harmful algae using remotely sensed data. The traditional ground sampling methods failed to capture the spatial variation observed in the image data. With improved techniques we are confident these methods can be used to effectively monitor algal blooms using the high spatial and temporal resolution.
Advisors/Committee Members: Kremens, Robert.
Subjects/Keywords: Cyanobacteria; Harmful algae; Multispectral; Phycocyanin
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APA (6th Edition):
McNamara, S. J. (2007). Using multispectral sensor WASP-Lite to analyze harmful algal blooms. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/2901
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
McNamara, Shari J. “Using multispectral sensor WASP-Lite to analyze harmful algal blooms.” 2007. Thesis, Rochester Institute of Technology. Accessed January 24, 2021.
https://scholarworks.rit.edu/theses/2901.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
McNamara, Shari J. “Using multispectral sensor WASP-Lite to analyze harmful algal blooms.” 2007. Web. 24 Jan 2021.
Vancouver:
McNamara SJ. Using multispectral sensor WASP-Lite to analyze harmful algal blooms. [Internet] [Thesis]. Rochester Institute of Technology; 2007. [cited 2021 Jan 24].
Available from: https://scholarworks.rit.edu/theses/2901.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
McNamara SJ. Using multispectral sensor WASP-Lite to analyze harmful algal blooms. [Thesis]. Rochester Institute of Technology; 2007. Available from: https://scholarworks.rit.edu/theses/2901
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of California – San Diego
6.
Yarimizu, Kyoko.
The role of iron in potential algal-bacterial mutualism as related to harmful algae blooms.
Degree: Chemistry (Joint Doctoral SDSU), 2018, University of California – San Diego
URL: http://www.escholarship.org/uc/item/7s95v31m
► Phytoplankton blooms can cause acute effects on marine ecosystems either due to their production of endogenous toxins or due to their enormous biomass leading to…
(more)
▼ Phytoplankton blooms can cause acute effects on marine ecosystems either due to their production of endogenous toxins or due to their enormous biomass leading to major impacts on local economies and public health. Despite years of effort, the causes of harmful algal blooms (HAB) are still not fully understood. Our hypothesis is that bacteria that produce photoactive siderophores may provide a bioavailable form of iron to commensally associated phytoplankton, which could in turn affect algal growth and bloom dynamics. Here we report both laboratory-based studies using binary cultures of the dinoflagellate Lingulodinium polyedrum, a major HAB species, with Marinobacter algicola DG893, a phytoplankton-associated bacterium that produces the photoactive siderophore vibrioferrin and analysis of field collected data linking seawater iron concentrations, HAB phytoplankton numbers and bacterial populations. Together these results support the notion of a carbon for iron mutualism in some bacterial-algal interactions.
Subjects/Keywords: Chemistry; Chemical oceanography; DG893; harmful algae; iron; L. polyedrum; siderophore; vibrioferrin
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APA (6th Edition):
Yarimizu, K. (2018). The role of iron in potential algal-bacterial mutualism as related to harmful algae blooms. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/7s95v31m
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yarimizu, Kyoko. “The role of iron in potential algal-bacterial mutualism as related to harmful algae blooms.” 2018. Thesis, University of California – San Diego. Accessed January 24, 2021.
http://www.escholarship.org/uc/item/7s95v31m.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yarimizu, Kyoko. “The role of iron in potential algal-bacterial mutualism as related to harmful algae blooms.” 2018. Web. 24 Jan 2021.
Vancouver:
Yarimizu K. The role of iron in potential algal-bacterial mutualism as related to harmful algae blooms. [Internet] [Thesis]. University of California – San Diego; 2018. [cited 2021 Jan 24].
Available from: http://www.escholarship.org/uc/item/7s95v31m.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yarimizu K. The role of iron in potential algal-bacterial mutualism as related to harmful algae blooms. [Thesis]. University of California – San Diego; 2018. Available from: http://www.escholarship.org/uc/item/7s95v31m
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
7.
Al-Kandari, Manal A.
Molecular studies of Karenia mikimotoi (Dinophyceae) from the Celtic Sea region.
Degree: PhD, 2012, University of Plymouth
URL: http://hdl.handle.net/10026.1/1088
► K. mikimotoi has been classified under many names and has been mis-assigned to different species and genera in the North Atlantic and Pacific because of…
(more)
▼ K. mikimotoi has been classified under many names and has been mis-assigned to different species and genera in the North Atlantic and Pacific because of its morphological similarities to other Gymnodinoid species. It is now known to be widely distributed, but there remain unresolved questions about whether K. mikimotoi was introduced into the North Sea from Japanese waters, or whether it has always inhabited this region and been erroneously classified as Gymnodinium spp. or has been a part of the hidden flora prior to be recognised in a bloom off the Norwegian coast in 1966. To address questions about geographical genetic variation within K. mikimotoi and broader issues about its biogeography it was deemed important to develop a suitable diagnostic molecular marker that could then be used to monitor the presence/absence of different K. mikimotoi ecotypes over long time scales in European waters. This study showed that the partial rDNA LSU (D1-D2) was too conserved to separate the different strains of K. mikimotoi, while, the ITS region was better able to discriminate between the different strains. However, the rbcL gene was the most informative gene and contained sufficient substitutions to separate the different strains of K. mikimotoi. Specific PCR-primers were designed to amplify a variable region of the rbcL gene able to distinguish differences between K. mikimotoi isolates from the different regions. The innovative high resolution melting temperature (HRM) technique based on specific primer set allowed rapid discrimination of K. mikimotoi from distinct geographic localities (= sequence variants) that differed by only a single nucleotide. Moreover, this study used archival environmental samples collected from the Celtic Sea shelf-break region. The high resolution melting temperature assay successfully detected the European K. mikimotoi isolate within the south-western English Channel in a 1963 sample, which is prior to thefirst report of a K. mikimotoi bloom in Norwegian waters in 1966 and in the south-western English Channel in 1975 and in western Japan in 1965. HRM observations were further validated using clone libraries and sequencing. In summary, this data provided more information about the genotypes present over the analysed timescales, revealing that K. mikimotoi sub-species 2 (European and New Zealand strains) was present in south-western English Channel and south-west Ireland for over 47 years, with sub-species 1 (the Japanese isolate) being absent from all examined samples. This finding supports the hypothesis that K. mikimotoi isolates within Europe are not of Japanese origin and suggests that they are native species to the region.
Subjects/Keywords: 579.87; Harmful Algae
…from different
geographical regions into distinct sub-groups. Harmful Algae, 10, 636-643… …Presentation at 14TH International
Conference on Harmful Algae, Hersonissos-Crete-Greece. 1-5th… …reference list of harmful micro-algae (Hansen and Moestrup, 2011 )
as toxic species.
9… …x29; phylogenetic analysis.
GIS: Geographic Information Systems.
HAB: Harmful Algal bloom… …SCHROEDER, D. C.
2011. Molecular tools separate Harmful Algal Bloom species, Karenia mikimotoi…
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APA (6th Edition):
Al-Kandari, M. A. (2012). Molecular studies of Karenia mikimotoi (Dinophyceae) from the Celtic Sea region. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/1088
Chicago Manual of Style (16th Edition):
Al-Kandari, Manal A. “Molecular studies of Karenia mikimotoi (Dinophyceae) from the Celtic Sea region.” 2012. Doctoral Dissertation, University of Plymouth. Accessed January 24, 2021.
http://hdl.handle.net/10026.1/1088.
MLA Handbook (7th Edition):
Al-Kandari, Manal A. “Molecular studies of Karenia mikimotoi (Dinophyceae) from the Celtic Sea region.” 2012. Web. 24 Jan 2021.
Vancouver:
Al-Kandari MA. Molecular studies of Karenia mikimotoi (Dinophyceae) from the Celtic Sea region. [Internet] [Doctoral dissertation]. University of Plymouth; 2012. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10026.1/1088.
Council of Science Editors:
Al-Kandari MA. Molecular studies of Karenia mikimotoi (Dinophyceae) from the Celtic Sea region. [Doctoral Dissertation]. University of Plymouth; 2012. Available from: http://hdl.handle.net/10026.1/1088
University of Hawaii – Manoa
8.
Timmerman, Amanda Heesoon Vinson.
Hidden thin layers of toxic diatoms in a coastal bay.
Degree: 2016, University of Hawaii – Manoa
URL: http://hdl.handle.net/10125/101034
► M.S. University of Hawaii at Manoa 2012.
Harmful algal blooms (HABs) can threaten animal and human health through the production of toxins such as domoic…
(more)
▼ M.S. University of Hawaii at Manoa 2012.
Harmful algal blooms (HABs) can threaten animal and human health through the production of toxins such as domoic acid. These blooms have become more frequent and toxic over the last few decades. In this study, we investigate the role that nutrients play in a toxic, subsurface bloom of Pseudo-nitzschia in northeastern Monterey Bay, California. Profilers and towed instruments were deployed and laboratory analyses of discrete water samples were conducted to describe the physical and biogeochemical conditions of the sampling site and to characterize the bloom. The Pseudo-nitzschia bloom occurred within a well-defined subsurface layer, containing high levels of domoic acid. In situ images taken within the layer revealed diatom flocs-indicators of nutrient stress. Nutrient ratios and alkaline phosphatase activity, commonly used to determine the nutritional status of phytoplankton, suggest that the Pseudo-nitzschia cells were phosphate stressed, and we speculate that this physiological stress led to increased toxicity of the bloom. Understanding how frequently blooms such as these are characterized by nutrient stress could improve our ability to predict the occurrence of HABs. With increased anthropogenic input of nutrients, such blooms could occur more often and with greater degrees of toxicity in the future.
Subjects/Keywords: harmful algae blooms; Monterey Bay; California; pseudo-nitzschia bloom
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APA (6th Edition):
Timmerman, A. H. V. (2016). Hidden thin layers of toxic diatoms in a coastal bay. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/101034
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Timmerman, Amanda Heesoon Vinson. “Hidden thin layers of toxic diatoms in a coastal bay.” 2016. Thesis, University of Hawaii – Manoa. Accessed January 24, 2021.
http://hdl.handle.net/10125/101034.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Timmerman, Amanda Heesoon Vinson. “Hidden thin layers of toxic diatoms in a coastal bay.” 2016. Web. 24 Jan 2021.
Vancouver:
Timmerman AHV. Hidden thin layers of toxic diatoms in a coastal bay. [Internet] [Thesis]. University of Hawaii – Manoa; 2016. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10125/101034.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Timmerman AHV. Hidden thin layers of toxic diatoms in a coastal bay. [Thesis]. University of Hawaii – Manoa; 2016. Available from: http://hdl.handle.net/10125/101034
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toledo
9.
Marshall, Lauren Elizabeth.
Manta-inspired Robotic Platform and Filter Design for
Mitigating Near-Shore Harmful Algal Blooms.
Degree: MS, Mechanical Engineering, 2019, University of Toledo
URL: http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556733016555221
► Anthropologic impacts on fresh water have created harmful algal blooms (HABs) that are challenging to address due to the scale of blooms and shallow conditions…
(more)
▼ Anthropologic impacts on fresh water have created
harmful algal blooms (HABs) that are challenging to address due to
the scale of blooms and shallow conditions along the shore [1].
Mimicking a manta ray’s motion and structure offers a platform for
an environmental service robot that can thrive under such
constraints. The structure of the manta enables slow gliding and
high maneuverability in shallow conditions. The fin placement and
dynamics allow periods of gliding through the water, reducing
actuation frequency and disruption to the surrounding environment.
This paper analyzes various robot platforms including conventional
and bioinspired. A survey led to ray-inspired robots and their
features as the optimal design for an environmental service robot.
This platform lends itself to a higher payload, allowing it to be
outfitted with systems for environmental remediation, such as
capturing of pollutants. By integrating a bioinspired algal filter
with a manta-inspired robotic platform, near-shore blooms could be
reduced without introducing a new threat to the struggling
ecosystem. Conventional filters clog quickly and must be cleaned or
replaced. A service robot must be able to function for an extended
period without human intervention. Therefore, collection of the
harmful algae needs to be a passive system with a low probability
of clogging. Filter feeding fish employ a mechanism that utilizes
structures within the fishs’ mouth called gill rakers to capture or
redirect
algae particles for consumption. A simplified design
inspired by gill rakers, implemented as a targeted filter, housed
in an aquatic robotic platform could remove
algae, acting as an
artificial predator. Two different filtering mechanisms and how
they interacted with algal scale particles were investigated. While
each design started as biomimetic, aiming to mimic the filtering
mechanism, both have been redesigned for the intended application
producing a bioinspired algal filter.
Advisors/Committee Members: Trease, Brian (Committee Chair).
Subjects/Keywords: Engineering; bioinspired; manta-ray; harmful algae bloom; soft robotics; bioinspired filter
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APA (6th Edition):
Marshall, L. E. (2019). Manta-inspired Robotic Platform and Filter Design for
Mitigating Near-Shore Harmful Algal Blooms. (Masters Thesis). University of Toledo. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556733016555221
Chicago Manual of Style (16th Edition):
Marshall, Lauren Elizabeth. “Manta-inspired Robotic Platform and Filter Design for
Mitigating Near-Shore Harmful Algal Blooms.” 2019. Masters Thesis, University of Toledo. Accessed January 24, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556733016555221.
MLA Handbook (7th Edition):
Marshall, Lauren Elizabeth. “Manta-inspired Robotic Platform and Filter Design for
Mitigating Near-Shore Harmful Algal Blooms.” 2019. Web. 24 Jan 2021.
Vancouver:
Marshall LE. Manta-inspired Robotic Platform and Filter Design for
Mitigating Near-Shore Harmful Algal Blooms. [Internet] [Masters thesis]. University of Toledo; 2019. [cited 2021 Jan 24].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556733016555221.
Council of Science Editors:
Marshall LE. Manta-inspired Robotic Platform and Filter Design for
Mitigating Near-Shore Harmful Algal Blooms. [Masters Thesis]. University of Toledo; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556733016555221
Bowling Green State University
10.
Beers, Emily N.
Investigating the Effects of Temperature on the Growth and
Toxin Production of Saxitoxin, Anatoxin and
Cylindropsermopsin-Producing Cyanobacteria.
Degree: MS, Biological Sciences, 2020, Bowling Green State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1607677838514276
► Cyanobacterial harmful algal blooms (cHABs) are a growing global issue that influences the health and socioeconomic status of those dependent on impacted water bodies. Variation…
(more)
▼ Cyanobacterial
harmful algal blooms (cHABs) are a
growing global issue that influences the health and socioeconomic
status of those dependent on impacted water bodies. Variation in
water surface temperatures driven by changing global climate has
allowed for increases in the growth of toxigenic HAB-forming
cyanobacteria. It has been documented that a range of some genera
have shifted with increasing temperature, causing some strains to
be able to invade new aquatic environments. While previous studies
have investigated the effects of temperature on
microcystin-producing cyanobacteria, in the current study, we test
the effects of temperature on individual cyanobacterial strains
capable of producing either saxitoxins, cylindrospermopsins or
anatoxin-a across a thermal gradient of 17 to 30 ºC under common
light and replete nutrient conditions. The goal is to determine the
strain specific optimal temperatures and limits for growth and
toxin production in these HAB-forming cyanobacteria. Using this
framework, we tested several different genera including,
Aphanizomenon, Dolichospermum, Cylindrospermopsis, and Anabaena.
Warmer temperatures favored cell growth while cooler temperatures
showed higher toxin production per cell. Overall, the most toxins
produced by samples at the end of the experiments were produced
where there were the fastest growth rates.
Advisors/Committee Members: Davis, Timothy (Advisor).
Subjects/Keywords: Biology; Environmental Science; Microbiology; harmful algae; cylindrospermopsin; saxitoxin; cyanobacteria
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APA ·
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APA (6th Edition):
Beers, E. N. (2020). Investigating the Effects of Temperature on the Growth and
Toxin Production of Saxitoxin, Anatoxin and
Cylindropsermopsin-Producing Cyanobacteria. (Masters Thesis). Bowling Green State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1607677838514276
Chicago Manual of Style (16th Edition):
Beers, Emily N. “Investigating the Effects of Temperature on the Growth and
Toxin Production of Saxitoxin, Anatoxin and
Cylindropsermopsin-Producing Cyanobacteria.” 2020. Masters Thesis, Bowling Green State University. Accessed January 24, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1607677838514276.
MLA Handbook (7th Edition):
Beers, Emily N. “Investigating the Effects of Temperature on the Growth and
Toxin Production of Saxitoxin, Anatoxin and
Cylindropsermopsin-Producing Cyanobacteria.” 2020. Web. 24 Jan 2021.
Vancouver:
Beers EN. Investigating the Effects of Temperature on the Growth and
Toxin Production of Saxitoxin, Anatoxin and
Cylindropsermopsin-Producing Cyanobacteria. [Internet] [Masters thesis]. Bowling Green State University; 2020. [cited 2021 Jan 24].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1607677838514276.
Council of Science Editors:
Beers EN. Investigating the Effects of Temperature on the Growth and
Toxin Production of Saxitoxin, Anatoxin and
Cylindropsermopsin-Producing Cyanobacteria. [Masters Thesis]. Bowling Green State University; 2020. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1607677838514276
11.
Edir José Tedesco.
Algas nocivas e ficotoxinas no Parque Aqüícola de São Francisco do Sul.
Degree: 2007, Universidade do Vale do Itajaí
URL: http://www6.univali.br/tede/tde_busca/arquivo.php?codArquivo=503
► A maricultura é uma importante fonte de alimento de alto poder nutritivo e geradora de trabalho e renda, Atualmente é um dos setores econômicos com…
(more)
▼ A maricultura é uma importante fonte de alimento de alto poder nutritivo e geradora de trabalho e renda, Atualmente é um dos setores econômicos com maior crescimento, com taxas anuais acima de 10%. Um dos entraves para a atividade, são as marés vermelhas, melhor definidas como florações de algas nocivas FANs, as quais nem sempre apresentam coloração avermelha, podem ser verde, parda, amarela ou simplesmente incolor. As FANs têm aumentado em intensidade e em importância, tendo em vista os prejuízos econômicos para a cadeia produtiva da maricultura, principalmente pela bioacumulação de ficotoxinas pelos moluscos bivalves, tornando-os impróprios para o consumo. O consumo de moluscos envenenados por ficotoxinas podem causar síndromes, sendo as mais importantes: envenenamento paralisante por moluscos - PSP, envenenamento diarréico por moluscos - DSP e envenenamento amnésico por moluscos ASP. As florações são de difícil previsão, podendo ocorrer tanto em paises desenvolvidos como em desenvolvimento. No Brasil, existem registros de florações de PSP e DSP, associadas aos cultivos. Em São Francisco do Sul-SC, o Parque Aqüícola, já é parte integrante da economia do município, onde as comunidades tradicionais são as maiores beneficiadas pela maricultura. Partindo dessa premissa, foi realizado um monitoramento do parque durante 14 meses, de outubro de 2004 a novembro de 2005, com amostras quinzenais e realização de bioensaio em camundongo com mexilhões Perna perna, para PSP e DSP, bem como o levantamento dos parâmetros ambientais. O presente estudo registrou um caso positivo para DSP, com duração aproximada de 15 dias, em setembro de 2005, causado pelo dinoflagelado Dinophysis acuminata. Pela importância da atividade, faz-se necessário à elaboração de um plano de gestão e monitoramento da maricultura, com a participação de todos os atores envolvidos, buscando resguardar a saúde humana, credibilidade da atividade e subsidiar a elaboração de normas e portarias disciplinadoras dos cultivos
The aquaculture is an important source of food, highly nutritive and a great job source. Nowadays it is one of the economic sectors of great growth, with an annual rate above 10%. One of the impediments for the full development this activity are the red tides incidence, better defined as harmful algal bloom (HAB), which do not always show the reddish colorations, as it could be greenish, yellowish, or simply colorless. HAB has been increasing in importance and intensity, in respect of economic losses for the mariculture productive chain, mainly by the shellfish accumulation of phycotoxins, produced by algae. This process, which turns the mussel improper for consumption, is difficult to forecast, it can happen either in developed or developing countries. Shellfish consumption poisoned by phycotoxins can cause syndromes, such as: paralytic shellfish poisons - PSP, diarrhetic shellfish poisons - DSP and amnesic shellfish poisons ASP. In Brazil, PSP and DSP have been found in culture area. In São Francisco do Sul-SC, in southern Brazil,…
Advisors/Committee Members: Luis Antonio de Oliveira Proença, Valéria Regina Bellotto.
Subjects/Keywords: algas nocivas; maricultura; ficotoxinas; DSP; CIENCIAS EXATAS E DA TERRA; harmful algae; mariculture; phycotoxins; DSP
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APA (6th Edition):
Tedesco, E. J. (2007). Algas nocivas e ficotoxinas no Parque Aqüícola de São Francisco do Sul. (Thesis). Universidade do Vale do Itajaí. Retrieved from http://www6.univali.br/tede/tde_busca/arquivo.php?codArquivo=503
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tedesco, Edir José. “Algas nocivas e ficotoxinas no Parque Aqüícola de São Francisco do Sul.” 2007. Thesis, Universidade do Vale do Itajaí. Accessed January 24, 2021.
http://www6.univali.br/tede/tde_busca/arquivo.php?codArquivo=503.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tedesco, Edir José. “Algas nocivas e ficotoxinas no Parque Aqüícola de São Francisco do Sul.” 2007. Web. 24 Jan 2021.
Vancouver:
Tedesco EJ. Algas nocivas e ficotoxinas no Parque Aqüícola de São Francisco do Sul. [Internet] [Thesis]. Universidade do Vale do Itajaí; 2007. [cited 2021 Jan 24].
Available from: http://www6.univali.br/tede/tde_busca/arquivo.php?codArquivo=503.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tedesco EJ. Algas nocivas e ficotoxinas no Parque Aqüícola de São Francisco do Sul. [Thesis]. Universidade do Vale do Itajaí; 2007. Available from: http://www6.univali.br/tede/tde_busca/arquivo.php?codArquivo=503
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
12.
Payton, Laura.
Chronobiologie moléculaire et comportementale des huîtres Crassostrea gigas diploïdes et triploïdes exposées à l'algue toxique Alexandrium minutum : Molecular and behavioral chronobiology of diploids and triploids oyters Crassostrea gigas exposed to the harmful algae Alexandrium minutum.
Degree: Docteur es, Géochimie et écotoxicologie, 2017, Bordeaux
URL: http://www.theses.fr/2017BORD0613
► Les efflorescences de la micro-algue toxique Alexandrium minutum sont en constante augmentation au niveau mondial, accentuées par les apports anthropiques et le réchauffement global, et…
(more)
▼ Les efflorescences de la micro-algue toxique Alexandrium minutum sont en constante augmentation au niveau mondial, accentuées par les apports anthropiques et le réchauffement global, et posent des problèmes écologiques, économiques et sanitaires. Lors d’une exposition à A. minutum, l’accumulation des phycotoxines paralysantes (PSP) dans les tissus semble être différente entre les huîtres diploïdes et triploïdes. Par ailleurs, de nombreuses fonctions physiologiques de l’huître C. gigas sont impactées. L’ensemble des fonctions physiologiques d’un organisme est régulé par des rythmes biologiques. Propriété fondamentale de la vie, les rythmes biologiques permettent aux organismes de se synchroniser et d’anticiper les variations cycliques de l’environnement. Dans mes travaux, je me suis intéressée aux rythmes biologiques des huîtres diploïdes et triploïdes C. gigas et à leurs interactions avec la contamination par les PSP. Une analyse in situ sur un an a mis en évidence une relation jusque-là inconnue entre le comportement valvaire de C. gigas et le cycle d’éclairement de la lune, ainsi qu’une relation fine et subtile des cycles comportementaux nycthéméraux et tidaux avec l’évolution annuelle de la photopériode. Cette relation est modulée par la ploïdie. Par ailleurs, la mise au point d’une approche non-invasive d’interférence par ARN a permis de mettre en évidence l’implication de l’horloge circadienne dans les processus de bioaccumulation des PSP chez C. gigas. Enfin, l’analyse du transcriptome cyclique dans les branchies de C. gigas a mis en évidence qu’au moins 42 % du transcriptome peut être exprimé de façon oscillante. Contre intuitivement, en condition d’alternance jour / nuit, une majorité de transcrits sont ultradiens, trois fois plus nombreux que les transcrits circadiens. Exposées à A. minutum, les huîtres ont montré un remodelage profond de leur transcriptome cyclique, pouvant entraîner la perte de synchronisation de l’huître avec son environnement.
Harmful algal blooms of Alexandrium minutum are constantly increasing at the global level, accentuated by anthropogenic contributions and global warming, causing ecological, economical and sanitary problems. During exposition to A. minutum, paralytic phycotoxins (PSP) accumulation differs between diploid and triploid oysters. Moreover, many physiological functions of the oyster C. gigas are impacted. All physiological functions of an organism are regulated by biological rhythms. As a fundamental property of life, biological rhythms allow organisms to synchronize and anticipate cyclic variations of the environment. In my work, I was interested in the biological rhythms of diploid and triploid oysters C. gigas, and their interactions with PSP contamination. A one-year in situ analysis revealed a previously unknown relationship between valve behavior of C. gigas and the lunar illumination cycle, as well as a fine and subtle relationship of the nycthemeral and tidal behavioral cycles with the annual evolution of the photoperiod. This relationship was modulated by…
Advisors/Committee Members: Massabuau, Jean Charles (thesis director), Tran, Damien (thesis director).
Subjects/Keywords: Huîtres; Algues toxiques; Chronobiologie; Comportement; RNAseq; Interférence; Oysters; Harmful algae; Chronobiology; Behavior; RNAseq; Interference
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APA ·
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APA (6th Edition):
Payton, L. (2017). Chronobiologie moléculaire et comportementale des huîtres Crassostrea gigas diploïdes et triploïdes exposées à l'algue toxique Alexandrium minutum : Molecular and behavioral chronobiology of diploids and triploids oyters Crassostrea gigas exposed to the harmful algae Alexandrium minutum. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2017BORD0613
Chicago Manual of Style (16th Edition):
Payton, Laura. “Chronobiologie moléculaire et comportementale des huîtres Crassostrea gigas diploïdes et triploïdes exposées à l'algue toxique Alexandrium minutum : Molecular and behavioral chronobiology of diploids and triploids oyters Crassostrea gigas exposed to the harmful algae Alexandrium minutum.” 2017. Doctoral Dissertation, Bordeaux. Accessed January 24, 2021.
http://www.theses.fr/2017BORD0613.
MLA Handbook (7th Edition):
Payton, Laura. “Chronobiologie moléculaire et comportementale des huîtres Crassostrea gigas diploïdes et triploïdes exposées à l'algue toxique Alexandrium minutum : Molecular and behavioral chronobiology of diploids and triploids oyters Crassostrea gigas exposed to the harmful algae Alexandrium minutum.” 2017. Web. 24 Jan 2021.
Vancouver:
Payton L. Chronobiologie moléculaire et comportementale des huîtres Crassostrea gigas diploïdes et triploïdes exposées à l'algue toxique Alexandrium minutum : Molecular and behavioral chronobiology of diploids and triploids oyters Crassostrea gigas exposed to the harmful algae Alexandrium minutum. [Internet] [Doctoral dissertation]. Bordeaux; 2017. [cited 2021 Jan 24].
Available from: http://www.theses.fr/2017BORD0613.
Council of Science Editors:
Payton L. Chronobiologie moléculaire et comportementale des huîtres Crassostrea gigas diploïdes et triploïdes exposées à l'algue toxique Alexandrium minutum : Molecular and behavioral chronobiology of diploids and triploids oyters Crassostrea gigas exposed to the harmful algae Alexandrium minutum. [Doctoral Dissertation]. Bordeaux; 2017. Available from: http://www.theses.fr/2017BORD0613
Virginia Commonwealth University
13.
Wood, Joseph.
Causes and Consequences of Algal Blooms in the Tidal Fresh James River.
Degree: PhD, Integrative Life Sciences, 2014, Virginia Commonwealth University
URL: https://doi.org/10.25772/8Y48-3Z85
;
https://scholarscompass.vcu.edu/etd/3429
► This dissertation includes 3 chapters which focus on algal bloom of the tidal fresh James River. The first chapter describes nutrient and light limitation assays…
(more)
▼ This dissertation includes 3 chapters which focus on algal bloom of the tidal fresh James River. The first chapter describes nutrient and light limitation assays performed on algal cultures and draw conclusions about long-term patterns in nutrient limitation by comparing results with a previous study . This chapter also describes the influence of riverine discharge upon nutrient limitation in a point-source dominated estuary. This chapter was published in Estuaries and Coasts (Wood and Bukaveckas 2014).
The second chapter presents the first comprehensive assessment of the occurrence of the cyanotoxin Microcystin in water and biota of the James River. Data presented in this chapter show that bivalve grazing declines in the presence of Microcystin in the water. The chapter also describes feeding habits in fish as a predictor for inter-specific differences in Microcystin accumulation in their tissues. The work presented in this chapter was published in Environmental Science & Technology (Wood et al. 2014).
The third chapter describes the fate of algal carbon in the James River Estuary and the importance of autochthonous and allochthonous sources of organic matter in supporting production of higher trophic levels. Here I draw upon ecosystem metabolism data (NPP and R), abundance and grazing estimates for primary consumers and estimates of advective losses of chlorophyll and external inputs of nitrogen to place ‘top-down’ effects in the broader context of factors influencing chlorophyll and nitrogen fluxes in the James. . This chapter also describes results from mesocosm experiments used to assess the influences of grazers on chlorophyll, nutrients and Microcystis. This work will be submitted in the summer of 2014 to the journal Ecosystems.
Advisors/Committee Members: Paul Bukaveckas.
Subjects/Keywords: Primary Production; Ecosystems Ecology; Water Quality; Harmful Algae; Cyanotoxins; Food Webs; Life Sciences
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APA ·
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APA (6th Edition):
Wood, J. (2014). Causes and Consequences of Algal Blooms in the Tidal Fresh James River. (Doctoral Dissertation). Virginia Commonwealth University. Retrieved from https://doi.org/10.25772/8Y48-3Z85 ; https://scholarscompass.vcu.edu/etd/3429
Chicago Manual of Style (16th Edition):
Wood, Joseph. “Causes and Consequences of Algal Blooms in the Tidal Fresh James River.” 2014. Doctoral Dissertation, Virginia Commonwealth University. Accessed January 24, 2021.
https://doi.org/10.25772/8Y48-3Z85 ; https://scholarscompass.vcu.edu/etd/3429.
MLA Handbook (7th Edition):
Wood, Joseph. “Causes and Consequences of Algal Blooms in the Tidal Fresh James River.” 2014. Web. 24 Jan 2021.
Vancouver:
Wood J. Causes and Consequences of Algal Blooms in the Tidal Fresh James River. [Internet] [Doctoral dissertation]. Virginia Commonwealth University; 2014. [cited 2021 Jan 24].
Available from: https://doi.org/10.25772/8Y48-3Z85 ; https://scholarscompass.vcu.edu/etd/3429.
Council of Science Editors:
Wood J. Causes and Consequences of Algal Blooms in the Tidal Fresh James River. [Doctoral Dissertation]. Virginia Commonwealth University; 2014. Available from: https://doi.org/10.25772/8Y48-3Z85 ; https://scholarscompass.vcu.edu/etd/3429
University of Miami
14.
Alrubaiaan, Entesar B. A. E. S.
Exploratory Study on the Role of Phycotoxins in Dinoflagellates.
Degree: MS, Marine Biology and Ecology (Marine), 2017, University of Miami
URL: https://scholarlyrepository.miami.edu/oa_theses/689
► Phycotoxins are secondary metabolites produced by dinoflagellates and other algae. Despite their notorious role in neurotoxicity to higher trophic level species, it is still…
(more)
▼ Phycotoxins are secondary metabolites produced by dinoflagellates and other
algae. Despite their notorious role in neurotoxicity to higher trophic level species, it is still unknown why
algae produce phycotoxins. This study reviewed the available literature, that forms our current knowledge on the potential ecological roles of phycotoxins. It also experimentally examined three untested hypotheses. First, the role of phycotoxins in chemical defense against bacteria was tested. The second hypothesis examined the role of toxins in dissipating excess energy from intense light. Lastly, the role of toxins in alleviating copper toxicity was tested. Two bloom-forming toxic dinoflagellates (
Alexandrium catenella a saxitoxin producer, and
Karenia brevis a brevetoxin producer) were selected for this work. With
A. catenella, three high toxic strains, one low toxic strain, and two nontoxic strains were selected. With
K.brevis one high toxic and one low toxic strain were chosen. The difference in toxicity was used to determine if toxic strains were more resistant to stress than the nontoxic strains of the same species. This research did not find evidence that toxin production provides an advantage to toxic
algae against the three tested stress factors. Instead, the results show that nontoxic strains were consistently more resistant to stress than the toxic strains in both species. Toxic
algae vulnerability may be the result of higher energy and nutrient allocation to toxin production.
Advisors/Committee Members: Larry E. Brand, Kathleen Rein, Andrew C. Baker.
Subjects/Keywords: Algae; Phytoplankton; Harmful Algal Blooms; Phycotoxins; Chemical defense; Energy dissipation; Copper toxicity
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Manager
APA (6th Edition):
Alrubaiaan, E. B. A. E. S. (2017). Exploratory Study on the Role of Phycotoxins in Dinoflagellates. (Thesis). University of Miami. Retrieved from https://scholarlyrepository.miami.edu/oa_theses/689
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Alrubaiaan, Entesar B A E S. “Exploratory Study on the Role of Phycotoxins in Dinoflagellates.” 2017. Thesis, University of Miami. Accessed January 24, 2021.
https://scholarlyrepository.miami.edu/oa_theses/689.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Alrubaiaan, Entesar B A E S. “Exploratory Study on the Role of Phycotoxins in Dinoflagellates.” 2017. Web. 24 Jan 2021.
Vancouver:
Alrubaiaan EBAES. Exploratory Study on the Role of Phycotoxins in Dinoflagellates. [Internet] [Thesis]. University of Miami; 2017. [cited 2021 Jan 24].
Available from: https://scholarlyrepository.miami.edu/oa_theses/689.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Alrubaiaan EBAES. Exploratory Study on the Role of Phycotoxins in Dinoflagellates. [Thesis]. University of Miami; 2017. Available from: https://scholarlyrepository.miami.edu/oa_theses/689
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Exeter
15.
Townhill, Bryony Lindsey.
Marine species and climate change : using modelling techniques to investigate effects on species distributions.
Degree: PhD, 2016, University of Exeter
URL: http://hdl.handle.net/10871/25283
► Anthropogenic climate change is one of the main challenges affecting the globe, with particular implications for the oceans. Marine climate change research has moved forward…
(more)
▼ Anthropogenic climate change is one of the main challenges affecting the globe, with particular implications for the oceans. Marine climate change research has moved forward rapidly in recent years, and a range of physical model outputs are available that can be used by ecologists to help predict how species might be affected into the future. Policy makers require a level of understanding of how certain species and their ranges might change so that they can respond with sustainable management actions. This thesis aims to make use of a number of modelling techniques to explore implications of past and future conditions for marine species, and to appraise those tools that can be used under differing circumstances. Policy questions are answered relating to changes in the abundance and distribution of marine species. The links between historical climatic conditions and Barents Sea cod abundance are explored using Generalised Additive Models using data collected in the middle of the 20th century. This valuable historical data indicated that cod have temperature preferences and expand and shift their distributions based on environmental conditions. A simpler modelling technique is used to examine how oxygen conditions have changed in recent decades in the North Sea, how they might change in the future, and what implications this has for commercial fish species. The models show that oxygen conditions have improved recently and that they will not decrease to levels that result in large negative effects in the coming century. Species distribution modelling using a combination of global and downscaled model outputs shows that the UK will become more suitable for some non-native and harmful algal species in the 21st century, and less suitable for others. The model outputs contribute to the understanding of climate change effects and development of management tools to ensure the resilience of marine ecosystems into the future.
Subjects/Keywords: 551.6; environmental change; oxygen; temperature; invasive; non-native; harmful algae; commercial fish
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APA (6th Edition):
Townhill, B. L. (2016). Marine species and climate change : using modelling techniques to investigate effects on species distributions. (Doctoral Dissertation). University of Exeter. Retrieved from http://hdl.handle.net/10871/25283
Chicago Manual of Style (16th Edition):
Townhill, Bryony Lindsey. “Marine species and climate change : using modelling techniques to investigate effects on species distributions.” 2016. Doctoral Dissertation, University of Exeter. Accessed January 24, 2021.
http://hdl.handle.net/10871/25283.
MLA Handbook (7th Edition):
Townhill, Bryony Lindsey. “Marine species and climate change : using modelling techniques to investigate effects on species distributions.” 2016. Web. 24 Jan 2021.
Vancouver:
Townhill BL. Marine species and climate change : using modelling techniques to investigate effects on species distributions. [Internet] [Doctoral dissertation]. University of Exeter; 2016. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10871/25283.
Council of Science Editors:
Townhill BL. Marine species and climate change : using modelling techniques to investigate effects on species distributions. [Doctoral Dissertation]. University of Exeter; 2016. Available from: http://hdl.handle.net/10871/25283
Uppsala University
16.
Rieseberg, Ashley.
Holistic approach to the evaluation of the anthropocentric influence on domoic acid production and the corresponding impact on the California Sea Lion (Zalophus californianus) population.
Degree: Earth Sciences, 2012, Uppsala University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-179182
► Domoic acid (DA) is a neurotoxin produced by the harmful algae Pseudo-nitzschia that has been directly linked to mass stranding events of the California…
(more)
▼ Domoic acid (DA) is a neurotoxin produced by the harmful algae Pseudo-nitzschia that has been directly linked to mass stranding events of the California Sea Lion (CSL). The purpose of this paper is to review the anthropogenic influence on the production of this neurotoxin and examine how human activities are impacting this marine mammal species. A comprehensive and interdisciplinary literature review was conducted to evaluate the future sustainability of the CSL population. It was found that while Pseudo-nitzschia bloom developments are vulnerable to anthropogenic influences, the incontestable existence of natural contributing factors adds a certain complexity to the determination of causalities and the development of solutions. Strong evidence exists to show that DA can cause major and irreversible neurological damage in CSLs. Rehabilitation of DA-impacted CSLs is a polarizing issue in the U.S. and presents interesting implications for sustainable development. While the CSL population is currently healthy and plenteous, the strong abundance of future uncertainties warrants concern. A balance must be found between the involving social, economic, and environmental factors to ensure a promising future for the CSL species.
Subjects/Keywords: Sustainable Development; Pseudo-nitzschia; Harmful Algae Bloom; Domoic Acid; California Sea Lion; Wildlife Rehabilitation
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APA (6th Edition):
Rieseberg, A. (2012). Holistic approach to the evaluation of the anthropocentric influence on domoic acid production and the corresponding impact on the California Sea Lion (Zalophus californianus) population. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-179182
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rieseberg, Ashley. “Holistic approach to the evaluation of the anthropocentric influence on domoic acid production and the corresponding impact on the California Sea Lion (Zalophus californianus) population.” 2012. Thesis, Uppsala University. Accessed January 24, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-179182.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rieseberg, Ashley. “Holistic approach to the evaluation of the anthropocentric influence on domoic acid production and the corresponding impact on the California Sea Lion (Zalophus californianus) population.” 2012. Web. 24 Jan 2021.
Vancouver:
Rieseberg A. Holistic approach to the evaluation of the anthropocentric influence on domoic acid production and the corresponding impact on the California Sea Lion (Zalophus californianus) population. [Internet] [Thesis]. Uppsala University; 2012. [cited 2021 Jan 24].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-179182.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rieseberg A. Holistic approach to the evaluation of the anthropocentric influence on domoic acid production and the corresponding impact on the California Sea Lion (Zalophus californianus) population. [Thesis]. Uppsala University; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-179182
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of South Florida
17.
Garrett, Matthew.
Influence of Water Column Stratification and Nutrient Gradients on the Migratory Behavior of the Red Tide Dinoflagellate, <i>Karenia brevis</i>.
Degree: 2015, University of South Florida
URL: https://scholarcommons.usf.edu/etd/5950
► Diel vertical migration (DVM) can offer motile phytoplankton a competitive advantage over other phytoplankton species. DVM has been well documented in the harmful dinoflagellate, Karenia…
(more)
▼ Diel vertical migration (DVM) can offer motile phytoplankton a competitive advantage over other phytoplankton species. DVM has been well documented in the harmful dinoflagellate, Karenia brevis; however, the extent to which changes in nutrient regimes and density stratification modify migration patterns has not been thoroughly investigated. A 2 m experimental column was constructed with sensors and sampling ports at four depths to obtain fluorescence and temperature measurements and discrete water samples. The environmental parameters of the experimental column represented temperature and nutrient conditions found on the West Florida Shelf (WFS), where Karenia blooms frequently occur. Results demonstrated a clear DVM pattern for K. brevis where surface aggregations occurred during light periods, and bottom aggregations occurred in dark periods. However, the rate and intensity of migration varied between experimental conditions. Injections of nutrient replete water at the surface and bottom did not appear to modify migratory behavior, in that a portion of the population resided at depth regardless of light or dark periods. Weak density stratification caused a delay in downward migration in dark periods, whereas strong density stratification caused a complete cessation of downward migration. In a weakly stratified environment with a bottom injected replete water mass, DVM patterns most closely replicate the pattern under weakly stratified conditions alone. Modifications in the natural DVM pattern of K. brevis with respect to varying environmental and nutrient conditions that occur on the WFS can have major implications current forecast model predictions, and for monitoring and mitigation strategies.
Subjects/Keywords: DVM; harmful algae; West Florida Shelf; experimental column; Other Oceanography and Atmospheric Sciences and Meteorology
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APA (6th Edition):
Garrett, M. (2015). Influence of Water Column Stratification and Nutrient Gradients on the Migratory Behavior of the Red Tide Dinoflagellate, <i>Karenia brevis</i>. (Thesis). University of South Florida. Retrieved from https://scholarcommons.usf.edu/etd/5950
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Garrett, Matthew. “Influence of Water Column Stratification and Nutrient Gradients on the Migratory Behavior of the Red Tide Dinoflagellate, <i>Karenia brevis</i>.” 2015. Thesis, University of South Florida. Accessed January 24, 2021.
https://scholarcommons.usf.edu/etd/5950.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Garrett, Matthew. “Influence of Water Column Stratification and Nutrient Gradients on the Migratory Behavior of the Red Tide Dinoflagellate, <i>Karenia brevis</i>.” 2015. Web. 24 Jan 2021.
Vancouver:
Garrett M. Influence of Water Column Stratification and Nutrient Gradients on the Migratory Behavior of the Red Tide Dinoflagellate, <i>Karenia brevis</i>. [Internet] [Thesis]. University of South Florida; 2015. [cited 2021 Jan 24].
Available from: https://scholarcommons.usf.edu/etd/5950.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Garrett M. Influence of Water Column Stratification and Nutrient Gradients on the Migratory Behavior of the Red Tide Dinoflagellate, <i>Karenia brevis</i>. [Thesis]. University of South Florida; 2015. Available from: https://scholarcommons.usf.edu/etd/5950
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Guelph
18.
Kodaolu, Busayo.
Characterizing Phosphorus Loss in Surface Runoff: Impact of Source, Application Method and Wetting-Drying Cycles.
Degree: MS, School of Environmental Sciences, 2019, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/16073
► Previous studies have shown greater risk of Phosphorus (P) loss from commercial fertilizer (CF) than manure especially when they are surface applied. The P losses…
(more)
▼ Previous studies have shown greater risk of Phosphorus (P) loss from commercial fertilizer (CF) than manure especially when they are surface applied. The P losses from soils of varying texture amended with either CF or manure at rates comparable to agronomic recommendation for CF was studied. Manure represented a greater and steady source of dissolved P to runoff. In addition, surface-placed P presented the greatest risk of P losses to runoff, while a subsurface band was a much better option of placing P except where efficient P source burial was restricted. The importance of post-application soil moisture condition prior to runoff on P losses was also examined. Exposing the soils to wetting and drying cycles increased the potential for dissolved P losses compared to when the soils were always wet. Selection of on-farm P management strategies should target appropriate P sources, rate, placement and timing while considering the soil’s properties.
Advisors/Committee Members: O'Halloran, Ivan (advisor).
Subjects/Keywords: Harmful Algae Blooms; phosphorus source; environmental quality; Phosphorus; application method; wetting-drying cycles
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APA (6th Edition):
Kodaolu, B. (2019). Characterizing Phosphorus Loss in Surface Runoff: Impact of Source, Application Method and Wetting-Drying Cycles. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/16073
Chicago Manual of Style (16th Edition):
Kodaolu, Busayo. “Characterizing Phosphorus Loss in Surface Runoff: Impact of Source, Application Method and Wetting-Drying Cycles.” 2019. Masters Thesis, University of Guelph. Accessed January 24, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/16073.
MLA Handbook (7th Edition):
Kodaolu, Busayo. “Characterizing Phosphorus Loss in Surface Runoff: Impact of Source, Application Method and Wetting-Drying Cycles.” 2019. Web. 24 Jan 2021.
Vancouver:
Kodaolu B. Characterizing Phosphorus Loss in Surface Runoff: Impact of Source, Application Method and Wetting-Drying Cycles. [Internet] [Masters thesis]. University of Guelph; 2019. [cited 2021 Jan 24].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/16073.
Council of Science Editors:
Kodaolu B. Characterizing Phosphorus Loss in Surface Runoff: Impact of Source, Application Method and Wetting-Drying Cycles. [Masters Thesis]. University of Guelph; 2019. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/16073
19.
Deglint, Jason.
Automatic Identification of Algae using Low-cost Multispectral Fluorescence Digital Microscopy, Hierarchical Classification & Deep Learning.
Degree: 2019, University of Waterloo
URL: http://hdl.handle.net/10012/15281
► Harmful algae blooms (HABs) can produce lethal toxins and are a rising global concern. In response to this threat, many organizations are monitoring algae populations…
(more)
▼ Harmful algae blooms (HABs) can produce lethal toxins and are a rising global concern. In response to this threat, many organizations are monitoring algae populations to determine if a water body might be contaminated. However, identifying algae types in a water sample requires a human expert, a taxonomist, to manually identify organisms using an optical microscope. This is a tedious, time-consuming process that is prone to human error and bias. Since many facilities lack on-site taxonomists, they must ship their water samples off site, further adding to the analysis time. Given the urgency of this problem, this thesis hypothesizes that multispectral fluorescence microscopy with a deep learning hierarchical classification structure is the optimal method to automatically identify algae in water on-site. To test this hypothesis, a low-cost system was designed and built which was able generate one brightfield image and four fluorescence images. Each of the four fluorescence images was designed to target a different pigment in algae, resulting in a unique autofluorescence spectral fingerprint for different phyla groups. To complement this hardware system, a software framework was designed and developed. This framework used the prior taxonomic structure of algae to create a hierarchical classification structure. This hierarchical classifier divided the classification task into three steps which were phylum, genus, and species level classification. Deep learning models were used at each branch of this hierarchical classifier allowing the optimal set of features to be implicitly learned from the input data. In order to test the efficacy of the proposed hardware system and corresponding software framework, a dataset of nine algae from 4 different phyla groups was created. A number of preprocessing steps were required to prepare the data for analysis. These steps were flat field correction, thresholding and cropping. With this multispectral imaging data, a number of spatial and spectral features were extracted for use in the feature-extraction-based models. This dataset was used to determine the relative performance of 12 different model architectures, and the proposed multispectral hierarchical deep learning approach achieved the top classification accuracy of 97% to the species level. Further inspection revealed that a traditional feature extraction method was able to achieve 95% to the phyla level when only using the multispectral fluorescence data. These observations strongly support that: (1) the proposed low-cost multispectral fluorescence imaging system, and (2) the proposed hierarchical structure based on the taxonomy prior, in combination with (3) deep learning methods for feature learning, is an effective method to automatically classify algae.
Subjects/Keywords: algae; fluorescence; microscopy; machine learning; deep learning; harmful algae bloom; computer vision; multispectral imaging; phytoplankton; water; environmental monitoring; artificial intelligence; pattern recognition; cyanobacteria; blue-green algae
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APA (6th Edition):
Deglint, J. (2019). Automatic Identification of Algae using Low-cost Multispectral Fluorescence Digital Microscopy, Hierarchical Classification & Deep Learning. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15281
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Deglint, Jason. “Automatic Identification of Algae using Low-cost Multispectral Fluorescence Digital Microscopy, Hierarchical Classification & Deep Learning.” 2019. Thesis, University of Waterloo. Accessed January 24, 2021.
http://hdl.handle.net/10012/15281.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Deglint, Jason. “Automatic Identification of Algae using Low-cost Multispectral Fluorescence Digital Microscopy, Hierarchical Classification & Deep Learning.” 2019. Web. 24 Jan 2021.
Vancouver:
Deglint J. Automatic Identification of Algae using Low-cost Multispectral Fluorescence Digital Microscopy, Hierarchical Classification & Deep Learning. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10012/15281.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Deglint J. Automatic Identification of Algae using Low-cost Multispectral Fluorescence Digital Microscopy, Hierarchical Classification & Deep Learning. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/15281
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
Paxinos, Rosemary.
Dynamics of phytoplankton in relation to tuna fish farms in Boston Bay and near-shore Spencer Gulf, South Australia.
Degree: 2007, Flinders University
URL: http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20081022.144704
► Interest in the effect of fish farming practices on the marine environment has arisen because there is concern that the wastes that fish farms produce…
(more)
▼ Interest in the effect of fish farming practices on the marine environment has arisen because there is concern that the wastes that fish farms produce may be contributing to eutrophication in coastal areas and the problem of harmful algal blooms. The focus of this thesis is an examination of phytoplankton distribution and abundance in relation to tuna fish farms in Boston Bay and near-shore Spencer Gulf. This is the first study in South Australia to define the short-term biomass fluctuations of chlorophyll and in vivo fluorescence, identify phytoplankton species distribution and abundance, including two potentially toxic dinoflagellates, and describe patch distribution relative to tuna fish farms in Boston Bay and the near-shore waters of Spencer Gulf. An ecological interpretation of phytoplankton distribution and abundance is determined and shows that community composition was different in lower Spencer Gulf compared to Boston Bay and upper Spencer Gulf sites. Pico- and nanophytoplankton were often the most abundant organisms. Diatoms and gymnoids were most common. Season and currents predominantly influenced the distribution of phytoplankton in Boston Bay and Spencer Gulf. Individual species may be influenced by inputs from the fish farms.
Chlorophyll levels were different between the Spencer Gulf and Boston Bay sites and no differences were recorded, using mean levels of chlorophyll, between tuna cages and controls. Chlorophyll levels were higher east of Boston Island in autumn of 1999. Chlorophyll levels appeared to show a slight increase between years. This may have been an anomalous natural variation and future research may investigate this in the long term. In addition, Principal Components Analysis (PCA) was used to investigate differences between treatments and the functional grouping model supported an ecological interpretation of the factors from the PCA. A total of 131 taxa of phytoplankton were identified in this study. The 14 dominant taxa were used in the PCA and of these, 9 were diatoms. Phytoplankton abundance was not different between tuna cages and controls. However, when examining individual species, Karenia mikimotoi was more prevalent at tuna cages, close to shore, east and west of Boston Island than at other sites. PCA showed how different species bloomed together and were seasonal. Karenia brevis and K. mikimotoi featured predominantly in the PCA with K. brevis the dominant organism during summer and autumn along with Gyrodinium spp. and smaller gymnoids. K. brevis blooms were most likely influenced by water temperatures and fixation of nitrogen from a Trichodesmium erythaeum bloom. K. mikimotoi bloomed bimodally and may be influenced by ammonia excreted from fish from the tuna farms but , on the other hand, may be limited by the high salinities of South Australian waters. Currents in the region distribute both organisms.
The final aspect of this study assessed finer temporal and spatial sampling using directional transects around tuna cages and controls using in-vivo…
Subjects/Keywords: Phytoplankton; Port Lincoln; South Australia; dinoflagellates; chlorophyll; harmful algae
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APA (6th Edition):
Paxinos, R. (2007). Dynamics of phytoplankton in relation to tuna fish farms in Boston Bay and near-shore Spencer Gulf, South Australia. (Thesis). Flinders University. Retrieved from http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20081022.144704
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Paxinos, Rosemary. “Dynamics of phytoplankton in relation to tuna fish farms in Boston Bay and near-shore Spencer Gulf, South Australia.” 2007. Thesis, Flinders University. Accessed January 24, 2021.
http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20081022.144704.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Paxinos, Rosemary. “Dynamics of phytoplankton in relation to tuna fish farms in Boston Bay and near-shore Spencer Gulf, South Australia.” 2007. Web. 24 Jan 2021.
Vancouver:
Paxinos R. Dynamics of phytoplankton in relation to tuna fish farms in Boston Bay and near-shore Spencer Gulf, South Australia. [Internet] [Thesis]. Flinders University; 2007. [cited 2021 Jan 24].
Available from: http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20081022.144704.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Paxinos R. Dynamics of phytoplankton in relation to tuna fish farms in Boston Bay and near-shore Spencer Gulf, South Australia. [Thesis]. Flinders University; 2007. Available from: http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20081022.144704
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
Nolan, Madeline.
Diversity of Algae Slows Growth of Microcystis.
Degree: MS, Natural Resources and Environment, 2015, University of Michigan
URL: http://hdl.handle.net/2027.42/113075
► As harmful algal blooms (HABs) have expanded in both size and scope, there have been increased efforts to design models that try to predict which…
(more)
▼ As
harmful algal blooms (HABs) have expanded in both size and scope, there have been increased efforts to design models that try to predict which ecosystems are at the greatest risk for a bloom. However, predicting blooms is a difficult process that has had limited success which we believe partly stems from the fact that efforts to date have considered a relatively small set of variables that influence algal growth. In particular, the focus on hydrology and abiotic conditions fails to consider biotic interactions that ultimately control the final composition of ecological communities.
In this study we examined how species richness of resident green
algae influenced the growth and carrying capacity of Microcystis in both low and high nutrient environments. We found that when either nitrogen or phosphorous were reduced, competition with green
algae had a significant negative impact on the growth rate and final biomass of Microcystis, but the species richness of the green algal assemblage had no discernible effect on outcomes. However, in a high nutrient environment, a species rich community of green
algae had a greater negative impact on the invasion success of Microcystis than a species-poor community.
These results suggest that biotic interactions with phytoplankton can be important in limiting the establishment and proliferation of HAB species like Microcystis, and diverse communities can be more resistant to proliferation of HABs under nutrient conditions that favor blooms. In the future, the inclusion of biotic variables that influence bloom formation, in addition to the physical and abiotic requirements of a HAB species, could more accurately predict HAB events allowing for more effective management of our freshwater resources in the future.
Advisors/Committee Members: Cardinale, Brad (advisor), Allan, J. David (committee member), Johengen, Thomas (committee member).
Subjects/Keywords: microcystis; harmful algae; species richness; Lake Erie
…of nuisance HAB species has not been studied to our
knowledge.
While many species of algae… …numerous other, often less harmful
algal species, all of which potentially utilize the same pool… …of inorganic resources. To what
extent does competition with resident algae for resources… …looked at how the species diversity of resident
green algae influenced the growth rate and… …x28;1) competition with resident algae for nutrients [N, P] will
significantly…
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APA (6th Edition):
Nolan, M. (2015). Diversity of Algae Slows Growth of Microcystis. (Masters Thesis). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/113075
Chicago Manual of Style (16th Edition):
Nolan, Madeline. “Diversity of Algae Slows Growth of Microcystis.” 2015. Masters Thesis, University of Michigan. Accessed January 24, 2021.
http://hdl.handle.net/2027.42/113075.
MLA Handbook (7th Edition):
Nolan, Madeline. “Diversity of Algae Slows Growth of Microcystis.” 2015. Web. 24 Jan 2021.
Vancouver:
Nolan M. Diversity of Algae Slows Growth of Microcystis. [Internet] [Masters thesis]. University of Michigan; 2015. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/2027.42/113075.
Council of Science Editors:
Nolan M. Diversity of Algae Slows Growth of Microcystis. [Masters Thesis]. University of Michigan; 2015. Available from: http://hdl.handle.net/2027.42/113075
Texas A&M University
22.
Neely, Tatum Elizabeth.
Differences in growth and toxicity of Karenia.
Degree: MS, Oceanography, 2006, Texas A&M University
URL: http://hdl.handle.net/1969.1/3979
► Harmful algal blooms (HABs) in the Gulf of Mexico are primarily caused by dense aggregations of the dinoflagellate species, Karenia brevis. Karenia brevis produces a…
(more)
▼ Harmful algal blooms (HABs) in the Gulf of Mexico are primarily caused by dense aggregations of the dinoflagellate species, Karenia brevis. Karenia brevis produces a highly toxic neurotoxin, brevetoxin which has been shown to cause Neurotoxic Shellfish Poisoning (NSP) and respiratory distress in humans in addition to a wide range of negative impacts upon natural ecosystems. Karenia mikimotoi is a co-existing species present during K. brevis blooms. K. mikimotoi has caused major HAB events in other parts of the ocean, but has not been recognized as a major contributor to toxicity of blooms in the Gulf of Mexico. K. brevis and K. mikimotoi have both been associated with the presence of unidentified hemolytic toxins. Production of hemolysins has not previously been investigated for either species to date in the Gulf of Mexico. Presence of hemolysins may affect toxicity and the overall impact of HABs. Therefore, detection of hemolysins is imperative for accurate identification of potential
harmful impacts of such blooms. The primary goal of this research is to define whether either species is capable of producing hemolytic activity independent of brevetoxin activity; and to identify if there is significant differentiation between a variety of clonal isolates regarding toxicity and growth rate when subjected to variable experimental conditions.
Advisors/Committee Members: Campbell, Lisa (advisor), Autenrieth, Robin (committee member), Gold, John (committee member), Long, Richard (committee member).
Subjects/Keywords: Karenia brevis; Gulf of Mexico; harmful algae
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APA (6th Edition):
Neely, T. E. (2006). Differences in growth and toxicity of Karenia. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3979
Chicago Manual of Style (16th Edition):
Neely, Tatum Elizabeth. “Differences in growth and toxicity of Karenia.” 2006. Masters Thesis, Texas A&M University. Accessed January 24, 2021.
http://hdl.handle.net/1969.1/3979.
MLA Handbook (7th Edition):
Neely, Tatum Elizabeth. “Differences in growth and toxicity of Karenia.” 2006. Web. 24 Jan 2021.
Vancouver:
Neely TE. Differences in growth and toxicity of Karenia. [Internet] [Masters thesis]. Texas A&M University; 2006. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/1969.1/3979.
Council of Science Editors:
Neely TE. Differences in growth and toxicity of Karenia. [Masters Thesis]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3979
Utah State University
23.
Bartos, Austin D.
Harmful Algal Blooms: Dominance in Lakes and Risk for Cyanotoxin Exposure in Food Crops.
Degree: MS, Watershed Sciences, 2020, Utah State University
URL: https://digitalcommons.usu.edu/etd/7871
► Climate change and human activities are promoting the dominance of a photosynthetic family of aquatic bacteria, cyanobacteria. Blooms of cyanobacteria are not only a…
(more)
▼ Climate change and human activities are promoting the dominance of a photosynthetic family of aquatic bacteria, cyanobacteria. Blooms of cyanobacteria are not only a visual nuisance but can produce a variety of cyanotoxins than can harm the liver, skin, and nervous system of animals and humans. We analyzed lakes in the contiguous United States and found that between 2007 and 2012, the number of lakes that produced measurable quantities of cyanotoxins increased from 33% to 45%. Nitrogen and phosphorus pollution were the main drivers of cyanobacteria blooms and toxin production between these years. Many of these lakes and reservoirs are used for crop irrigation and more frequent and toxic cyanobacteria blooms intensifies the risk of human and animal exposure to cyanotoxins through the consumption of toxic plants. We assessed how three cyanotoxins are distributed between soil, irrigation water, and lettuce plants to evaluate the exposure risk that cyanotoxins in food pose to human health. We found soil to sorb between 12 to 52% of two cyanotoxins from water, which could temporarily prevent the toxins from being taken up by plant roots and deposited into edible tissue. Also, we grew lettuce plants in a greenhouse and irrigated them with cyanotoxins. Cyanotoxins did not affect plant growth, however, we were unable to quantify the concentration of the toxins in the lettuce due to analytical limitations or that the plants were unable to sorb the toxins. Lastly, we analyzed the results from 14 published research studies on cyanotoxins in food irrigated with contaminated water. We found significant relationships between cyanotoxin concentrations in the irrigation water and those measured in plant tissues. Generally, the more cyanotoxins in the irrigation water the more cyanotoxins are measured in plants. The increase in cyanotoxin producing blooms needs to be mitigated to reduce associated health and economic risks. Management and policies should be implemented that not only mitigate the drivers of cyanobacteria and their toxins but also places limits on the acceptable concentrations in irrigation water.
Advisors/Committee Members: Janice Brahney, Daniel Drost, William Doucette, ;.
Subjects/Keywords: cyanotoxins; lakes; harmful algae blooms; climate change; food; toxicology; Ecology and Evolutionary Biology; Food Science; Terrestrial and Aquatic Ecology
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APA (6th Edition):
Bartos, A. D. (2020). Harmful Algal Blooms: Dominance in Lakes and Risk for Cyanotoxin Exposure in Food Crops. (Masters Thesis). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/7871
Chicago Manual of Style (16th Edition):
Bartos, Austin D. “Harmful Algal Blooms: Dominance in Lakes and Risk for Cyanotoxin Exposure in Food Crops.” 2020. Masters Thesis, Utah State University. Accessed January 24, 2021.
https://digitalcommons.usu.edu/etd/7871.
MLA Handbook (7th Edition):
Bartos, Austin D. “Harmful Algal Blooms: Dominance in Lakes and Risk for Cyanotoxin Exposure in Food Crops.” 2020. Web. 24 Jan 2021.
Vancouver:
Bartos AD. Harmful Algal Blooms: Dominance in Lakes and Risk for Cyanotoxin Exposure in Food Crops. [Internet] [Masters thesis]. Utah State University; 2020. [cited 2021 Jan 24].
Available from: https://digitalcommons.usu.edu/etd/7871.
Council of Science Editors:
Bartos AD. Harmful Algal Blooms: Dominance in Lakes and Risk for Cyanotoxin Exposure in Food Crops. [Masters Thesis]. Utah State University; 2020. Available from: https://digitalcommons.usu.edu/etd/7871
24.
Panlilio, Jennifer M.
Impacts of developmental exposures to the harmful algal bloom toxin domoic acid on neural development and behavior.
Degree: 2019, MIT and Woods Hole Oceanographic Institution
URL: http://hdl.handle.net/1912/24081
► Harmful algal blooms (HABs) can produce potent neurotoxins that accumulate in seafood and affect human health. One HAB toxin of concern is domoic acid (DomA),…
(more)
▼ Harmful algal blooms (HABs) can produce potent neurotoxins that accumulate in seafood and affect human health. One HAB toxin of concern is domoic acid (DomA), a glutamate analog produced by the marine diatom Pseudo-nitzschia spp. Current regulatory limits are designed to prevent acute neurotoxicity in adult humans. However, research shows that low-level exposure
during early life can lead to long-term changes in behavior, neural connectivity, and brain morphology. To determine the underlying mechanisms of developmental toxicity, this dissertation used zebrafish as a tool to: i) Establish the developmental window of susceptibility for DomA toxicity, ii) Characterize the behavioral consequences of exposures, and iii) Identify the cellular targets and processes perturbed by DomA. I found that DomA exposure particularly at 2 days post fertilization (dpf) led to altered startle response behavior, myelination defects, and the downregulation of axonal and myelin structural genes. Using vital dyes and immunolabeling, I assessed DomA-induced alterations in cells required for the startle response. I found no differences in the number of sensory neuromasts or in the sensory cranial ganglia structures that detect the acoustic stimuli. However, the majority of DomA-treated larvae lacked one or both Mauthner cells – hindbrain neurons critical for fast startle responses. DomA-treated larvae also had oligodendrocytes with fewer and shorter myelin sheaths, and appeared to aberrantly myelinate neuronal cell bodies. The loss of the Mauthner neurons and their axons may lead to a cellular environment where oligodendrocytes myelinate neuronal cell bodies in the absence of adequate axonal targets. Indeed, pharmacological treatment that reduced the oligodendrocyte number also led to the reduction in the number of these aberrant, myelinated cell bodies. These results indicate that exposure to DomA at a particular period in neural development targets specific cell types, disrupts myelination in the spinal cord, and leads to prolonged behavioral deficits. These mechanistic insights support hazard assessments of DomA exposures in humans during critical periods in early development.
Subjects/Keywords: Domoic acid; HAB toxins; developmental toxicity; windows of susceptibility; startle response; myelination; harmful algal bloom toxins; escape response; Mauthner cells; Harmful algal blooms; Reticulospinal neurons; Mauthner neuron; Myelin; Oligodendrocytes; Oligodendrocyte precursor cells; Algae; Neurotoxic agents; Health
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APA (6th Edition):
Panlilio, J. M. (2019). Impacts of developmental exposures to the harmful algal bloom toxin domoic acid on neural development and behavior. (Thesis). MIT and Woods Hole Oceanographic Institution. Retrieved from http://hdl.handle.net/1912/24081
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Panlilio, Jennifer M. “Impacts of developmental exposures to the harmful algal bloom toxin domoic acid on neural development and behavior.” 2019. Thesis, MIT and Woods Hole Oceanographic Institution. Accessed January 24, 2021.
http://hdl.handle.net/1912/24081.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Panlilio, Jennifer M. “Impacts of developmental exposures to the harmful algal bloom toxin domoic acid on neural development and behavior.” 2019. Web. 24 Jan 2021.
Vancouver:
Panlilio JM. Impacts of developmental exposures to the harmful algal bloom toxin domoic acid on neural development and behavior. [Internet] [Thesis]. MIT and Woods Hole Oceanographic Institution; 2019. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/1912/24081.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Panlilio JM. Impacts of developmental exposures to the harmful algal bloom toxin domoic acid on neural development and behavior. [Thesis]. MIT and Woods Hole Oceanographic Institution; 2019. Available from: http://hdl.handle.net/1912/24081
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
25.
Rizzo, Adriana.
OCEAN ECOSYSTEM TRANSFORMATION CAUSED BY RAPID WARMING AND SEA LEVEL RISE IN THE PLEISTOCENE CARIACO BASIN (MIS 9-7).
Degree: 2019, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/16731air13
► Local phytoplankton community structure has implications for larger ocean ecosystems and the global carbon cycle. Understanding the response of these ecosystems to warming in the…
(more)
▼ Local phytoplankton community structure has implications for larger ocean ecosystems and the global carbon cycle. Understanding the response of these ecosystems to warming in the tropics is important for understanding future global change. We examined changes in phytoplankton community composition over a full glacial cycle in MIS 9-7 (330-230 kya) in the sediments from the Cariaco Basin (ODP Site 1002). Phytoplankton communities were reconstructed using both calcareous nannoplankton assemblages and sterol and alkenone biomarkers. These data were integrated with alkenone, microfossil, and sterol proxies for temperature and circulation. Emiliania huxleyi occurred definitively in the Cariaco Basin for the first time between 250 and 240 kya, possibly due to increased connectivity caused by rising sea level. At the same time, environmental variability increased during a period of rapid warming from 250-240 kyr, inducing ecological turnover at both species- and larger clade levels. In general, during interglacials, the basin was more productive and more stratified, suggesting higher nutrient fluxes from land and greater rainfall associated with a more northerly ITCZ. This suggests that current warming may cause similar species introductions, productivity changes, and disruptions to phytoplankton populations.
Advisors/Committee Members: Timothy Bralower, Thesis Advisor/Co-Advisor, Katherine Haines Freeman, Thesis Advisor/Co-Advisor, Mark E Patzkowsky, Committee Member.
Subjects/Keywords: paleoceanography; coccolithophores; phytoplankton; paleoecology; organic geochemistry; Pleistocene; Climate Change; harmful algae bloom; productivity; sea level; ITCZ; Cariaco Basin; micropaleontology; UK37; nutrients; Emiliania huxleyi; Florisphaera profunda; dinoflagellates; Margalef's Mandala; MIS 8
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APA (6th Edition):
Rizzo, A. (2019). OCEAN ECOSYSTEM TRANSFORMATION CAUSED BY RAPID WARMING AND SEA LEVEL RISE IN THE PLEISTOCENE CARIACO BASIN (MIS 9-7). (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16731air13
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rizzo, Adriana. “OCEAN ECOSYSTEM TRANSFORMATION CAUSED BY RAPID WARMING AND SEA LEVEL RISE IN THE PLEISTOCENE CARIACO BASIN (MIS 9-7).” 2019. Thesis, Penn State University. Accessed January 24, 2021.
https://submit-etda.libraries.psu.edu/catalog/16731air13.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rizzo, Adriana. “OCEAN ECOSYSTEM TRANSFORMATION CAUSED BY RAPID WARMING AND SEA LEVEL RISE IN THE PLEISTOCENE CARIACO BASIN (MIS 9-7).” 2019. Web. 24 Jan 2021.
Vancouver:
Rizzo A. OCEAN ECOSYSTEM TRANSFORMATION CAUSED BY RAPID WARMING AND SEA LEVEL RISE IN THE PLEISTOCENE CARIACO BASIN (MIS 9-7). [Internet] [Thesis]. Penn State University; 2019. [cited 2021 Jan 24].
Available from: https://submit-etda.libraries.psu.edu/catalog/16731air13.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rizzo A. OCEAN ECOSYSTEM TRANSFORMATION CAUSED BY RAPID WARMING AND SEA LEVEL RISE IN THE PLEISTOCENE CARIACO BASIN (MIS 9-7). [Thesis]. Penn State University; 2019. Available from: https://submit-etda.libraries.psu.edu/catalog/16731air13
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Miami University
26.
Kielaszek, Andrew.
Public vs. Private Environmental Jobs: A Comparison of Job
Experiences with the Maryland Department of Natural Resources and
Ecology and Environment, Inc.
Degree: Master of Environmental Science, Environmental Sciences, 2009, Miami University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=miami1239628145
► The environmental job market is a dynamic and rapidly changing place. Different opportunities are appearing every day and individuals often have the choice to work…
(more)
▼ The environmental job market is a dynamic and rapidly
changing place. Different opportunities are appearing every day and
individuals often have the choice to work in a variety of different
work environments. This paper considers two broad sectors of the
environmental job market and evaluates the advantages and
disadvantages of working in each based on real-world work
experiences. Two six-month internships were undertaken with the
goal of evaluating and comparing the work environment of public
(i.e. government) environmental employment with private (i.e.
consulting) environmental employment. The first experience was at
the Maryland Department of Natural Resources, Resource Assessment
Service, Tidewater Ecosystem Assessment division, in Annapolis, MD
from August, 2007 until February, 2008. The second experience was
with Ecology and Environment, Inc., an environmental consulting
firm in Lancaster, NY, from March, 2008 until August,
2008.
Advisors/Committee Members: Woy-Hazleton, Sandra (Advisor).
Subjects/Keywords: Environmental Science; Internship; harmful algae; Maryland coastal bays; environmental consulting; wetlands
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APA (6th Edition):
Kielaszek, A. (2009). Public vs. Private Environmental Jobs: A Comparison of Job
Experiences with the Maryland Department of Natural Resources and
Ecology and Environment, Inc. (Masters Thesis). Miami University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=miami1239628145
Chicago Manual of Style (16th Edition):
Kielaszek, Andrew. “Public vs. Private Environmental Jobs: A Comparison of Job
Experiences with the Maryland Department of Natural Resources and
Ecology and Environment, Inc.” 2009. Masters Thesis, Miami University. Accessed January 24, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=miami1239628145.
MLA Handbook (7th Edition):
Kielaszek, Andrew. “Public vs. Private Environmental Jobs: A Comparison of Job
Experiences with the Maryland Department of Natural Resources and
Ecology and Environment, Inc.” 2009. Web. 24 Jan 2021.
Vancouver:
Kielaszek A. Public vs. Private Environmental Jobs: A Comparison of Job
Experiences with the Maryland Department of Natural Resources and
Ecology and Environment, Inc. [Internet] [Masters thesis]. Miami University; 2009. [cited 2021 Jan 24].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=miami1239628145.
Council of Science Editors:
Kielaszek A. Public vs. Private Environmental Jobs: A Comparison of Job
Experiences with the Maryland Department of Natural Resources and
Ecology and Environment, Inc. [Masters Thesis]. Miami University; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=miami1239628145
Université de Bordeaux I
27.
Mat, Audrey.
Étude des rythmes biologiques de l'huître Crassostrea gigas et de leur perturbation par l’algue toxique Alexandrium minutum : Analysis of biological rhythms in the oyster Crassotrea gigas and of potential rhythm disruption by the harmful algae Alexandrium minutum.
Degree: Docteur es, Géochimie et écotoxicologie, 2012, Université de Bordeaux I
URL: http://www.theses.fr/2012BOR14628
► Les rythmes biologiques constituent une propriété fondamentale de la vie, permettant aux organismes d’appréhender leur environnement et d’en anticiper les changements. Ces rythmes possèdent une…
(more)
▼ Les rythmes biologiques constituent une propriété fondamentale de la vie, permettant aux organismes d’appréhender leur environnement et d’en anticiper les changements. Ces rythmes possèdent une double origine : une horloge moléculaire génère ces rythmes, qui sont ensuite synchronisés par des facteurs environnementaux. Si les organismes terrestres sont essentiellement soumis au rythme d’alternance jour/nuit, les espèces marines côtières et estuariennes occupent un biotope plus changeant encore : ils sont en effet également confrontés au rythme des marées. Pourtant, leurs rythmes biologiques sont à ce jour encore mal connus et les mécanismes moléculaires de(s) (l’) horloge(s) sous-jacente(s) ne sont pas caractérisés. Parallèlement, les efflorescences d’algues toxiques, en constante augmentation depuis 1970, constituent un problème écologique majeur, tant local qu’international. Les objectifs du présent travail consistaient à caractériser les rythmes de référence de l’huître Crassostrea gigas et d’en déterminer l’origine (moléculaire, zeitgebers). Il s’agissait ensuite d’étudier les perturbations potentielles de ces rythmes par l’algue toxique Alexandrium minutum, qui produit des toxines paralytiques et est régulièrement présente dans de nombreuses mers du globe. Les travaux réalisés ont permis de mettre en évidence l’existence d’un rythme d’activité valvaire circadien, faible et dual, et n’a pas permis de supporter l’hypothèse de l’existence d’une horloge circatidale. Nous avons formulé l’hypothèse que, chez C. gigas, le rythme tidal est soit d’origine exogène, soit produit par l’horloge circadienne synchronisée par les marées. Les analyses moléculaires réalisées sur le gène circadien cryptochrome dans le muscle adducteur - effecteur du mouvement des valves - ont montré que ce gène oscille à une fréquence tidale dans le muscle strié, favorisant notre seconde hypothèse. Par ailleurs, au-delà des gènes de l’horloge, l’algue A. minutum réprime l’expression de gènes impliqués dans différentes voies métaboliques importantes : la lutte contre le stress oxydant (cat, gpx), la respiration mitochondriale (cox1), l’immunité (ilk), la détoxification (mdr). Finalement nos analyses ont permis de mettre en évidence un impact génotoxique d’A. minutum chez C. gigas.
Biological rhythms constitute a fundamental property of life, allowing organisms to anticipate and adapt to their changing environment. These rhythms present a double origin: they are generated by a molecular clock and synchronized by environmental cues. Whereas terrestrial organisms are mainly subjected to day/night alternation, coastal and estuarine marine species inhabit an even more cycling biotope. They are indeed also submitted to tides. Nevertheless, biological rhythms in marine species are still unrecognized and molecular mechanisms of the underlying oscillator(s) are to date not determined. At the same time, toxic algae blooms are increasing since the 1970s and represent a major ecological concern, both at local and international levels. An objective of the…
Advisors/Committee Members: Mat, Audrey (thesis director), Massabuau, Jean Charles (thesis director).
Subjects/Keywords: Crassostrea gigas; Rythme biologique; Alexandrium minutum; Horloge biologique; Horloge circadienne; Horloge circatidale; Algues toxiques; Saxitoxine; Cryptochrome; Génotoxicité; Crassostrea gigas; Biological rhythm; Alexandrium minutum; Biological clock; Circadian clock; Circatidal clock; Harmful algae; Saxitoxin; Cryptochrome; Genotoxic; Alexandrium minutum
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Mat, A. (2012). Étude des rythmes biologiques de l'huître Crassostrea gigas et de leur perturbation par l’algue toxique Alexandrium minutum : Analysis of biological rhythms in the oyster Crassotrea gigas and of potential rhythm disruption by the harmful algae Alexandrium minutum. (Doctoral Dissertation). Université de Bordeaux I. Retrieved from http://www.theses.fr/2012BOR14628
Chicago Manual of Style (16th Edition):
Mat, Audrey. “Étude des rythmes biologiques de l'huître Crassostrea gigas et de leur perturbation par l’algue toxique Alexandrium minutum : Analysis of biological rhythms in the oyster Crassotrea gigas and of potential rhythm disruption by the harmful algae Alexandrium minutum.” 2012. Doctoral Dissertation, Université de Bordeaux I. Accessed January 24, 2021.
http://www.theses.fr/2012BOR14628.
MLA Handbook (7th Edition):
Mat, Audrey. “Étude des rythmes biologiques de l'huître Crassostrea gigas et de leur perturbation par l’algue toxique Alexandrium minutum : Analysis of biological rhythms in the oyster Crassotrea gigas and of potential rhythm disruption by the harmful algae Alexandrium minutum.” 2012. Web. 24 Jan 2021.
Vancouver:
Mat A. Étude des rythmes biologiques de l'huître Crassostrea gigas et de leur perturbation par l’algue toxique Alexandrium minutum : Analysis of biological rhythms in the oyster Crassotrea gigas and of potential rhythm disruption by the harmful algae Alexandrium minutum. [Internet] [Doctoral dissertation]. Université de Bordeaux I; 2012. [cited 2021 Jan 24].
Available from: http://www.theses.fr/2012BOR14628.
Council of Science Editors:
Mat A. Étude des rythmes biologiques de l'huître Crassostrea gigas et de leur perturbation par l’algue toxique Alexandrium minutum : Analysis of biological rhythms in the oyster Crassotrea gigas and of potential rhythm disruption by the harmful algae Alexandrium minutum. [Doctoral Dissertation]. Université de Bordeaux I; 2012. Available from: http://www.theses.fr/2012BOR14628
University of South Florida
28.
Leverone, James R.
Comparative effects of the toxic dinoflagellate, Karenia brevis, on bivalve molluscs from Florida.
Degree: 2007, University of South Florida
URL: https://scholarcommons.usf.edu/etd/2260
► The effects of the toxic dinoflagellate, karenia brevis (Wilson clone), on larval survival and development of the northern quahog (=hard clam, Mercenaria mercenaria), eastern oyster…
(more)
▼ The effects of the toxic dinoflagellate, karenia brevis (Wilson clone), on larval survival and development of the northern quahog (=hard clam, Mercenaria mercenaria), eastern oyster (Crassostrea virginica) and bay scallop (Argopecten irradians) were studied in the laboratory. The effects of K. brevis on feeding activities of juveniles from these species plus the green mussel (Perna viridis) were also examined. Finally, adult bay scallops were exposed to K. brevis for two weeks to investigate possible cytotoxic effects. Survival of 3-day-old larvae was generally > 85% for all shellfish species at Karenia brevis densities of 100 cells . ml-1 or less, and not significantly different between whole and lysed culture. At 1,000 cells . ml-1, survival was significantly less in lysed culture than whole culture for both M. mercenaria and C. virginica. Survival of 7-day-old larvae in all species was not significantly affected at densities up to 1,000 cells . ml-1.
At 5,000 cells . ml-1, however, survival was reduced to 37, 26 and 19% for A. irradians, M. mercenaria and C. virginica, respectively. Development of C. virginica and M. mercenaria larvae was protracted at K. brevis densities of 1,000 cells . ml-1. Clearance rates of juveniles were determined under static and flow-through conditions using whole and lysed cultures of K. brevis. The bay scallop was most sensitive, exhibiting a 79% reduction in clearance rate at 1,000 cells . ml-1 of whole culture. The eastern oyster was least responsive, showing a 38% reduction in clearance rate between the same treatments. The green mussel and the northern quahog displayed intermediate responses. Similar results were observed during longer (2 day) exposures to a continuous supply of K. brevis. Bay scallops showed a significant decline in clearance rate at 100 cells . ml-1 after 24 hr exposure; clearance rate of oysters was not affected by K. brevis at this concentration.
No mortality was observed for any species during these brief exposures. Adult bay scallops exposed to K. brevis for two weeks showed degenerative and inflammatory changes in the digestive gland, including reduced thickness of the epithelium, increased size of digestive tubule lumens and hemocytic infiltration. The prospect for recovery of bay scallop populations in Florida may be hampered by recurring blooms of K. brevis.
Subjects/Keywords: Harmful algae; Molluscs; Larvae; Juveniles; Mortality; Clearance rate; Histopathology; American Studies; Arts and Humanities
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APA (6th Edition):
Leverone, J. R. (2007). Comparative effects of the toxic dinoflagellate, Karenia brevis, on bivalve molluscs from Florida. (Thesis). University of South Florida. Retrieved from https://scholarcommons.usf.edu/etd/2260
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Leverone, James R. “Comparative effects of the toxic dinoflagellate, Karenia brevis, on bivalve molluscs from Florida.” 2007. Thesis, University of South Florida. Accessed January 24, 2021.
https://scholarcommons.usf.edu/etd/2260.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Leverone, James R. “Comparative effects of the toxic dinoflagellate, Karenia brevis, on bivalve molluscs from Florida.” 2007. Web. 24 Jan 2021.
Vancouver:
Leverone JR. Comparative effects of the toxic dinoflagellate, Karenia brevis, on bivalve molluscs from Florida. [Internet] [Thesis]. University of South Florida; 2007. [cited 2021 Jan 24].
Available from: https://scholarcommons.usf.edu/etd/2260.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Leverone JR. Comparative effects of the toxic dinoflagellate, Karenia brevis, on bivalve molluscs from Florida. [Thesis]. University of South Florida; 2007. Available from: https://scholarcommons.usf.edu/etd/2260
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of South Florida
29.
Delaney, Jennifer A.
Molecular Detection of the Toxic Marine Diatom Pseudo-nitzschia multiseries.
Degree: 2010, University of South Florida
URL: https://scholarcommons.usf.edu/etd/3558
► The marine diatom genus Pseudo-nitzschia includes species that produce domoic acid, a neurotoxin responsible for illness and mortality in both humans and marine wildlife. Because…
(more)
▼ The marine diatom genus Pseudo-nitzschia includes species that produce domoic acid, a neurotoxin responsible for illness and mortality in both humans and marine wildlife. Because of the expertise and time required for the microscopic discrimination of species, molecular methods that monitor environmental concentrations of Pseudo-nitzschia provide a rapid alternative for the early detection of blooms and prediction of toxin accumulation. We have developed a nucleic acid sequence-based amplification with internal control RNA (IC-NASBA) assay and a quantitative reverse transcription PCR (qRT-PCR) assay for the detection of the toxic species P. multiseries targeting the ribulose- 1,5-biphosphate carboxylase/oxygenase small subunit (rbcS) gene. Both methods use RNA amplification and fluorescence-based real-time detection. Due to a limited rbcS sequence database, primers were designed and used to sequence this gene from 14 strains of Pseudo-nitzschia (including four P. multiseries) and 19 other marine diatoms. The IC-NASBA and qRT-PCR assays had a limit of detection of one cultured cell of P. multiseries and were linear over four and five orders of magnitude, respectively (r2 ! 0.98). Neither of the assays detected closely related organisms outside the Pseudo-nitzschia genus, and the qRT-PCR assay was specific to P. multiseries. While cross-reactivity of primers with unknown species prevented reliable detection of P. multiseries in spiked environmental samples using IC-NASBA, the qRT-PCR assay had positive detection from 107 cells/L to 103 cells/L. Nearly a 1:1 relationship was observed between predicted and calculated cell concentrations using qRT-PCR. Based on a diel expression study, the rbcS transcript copy number per cell ranged from 2.16 x 104 to 5.35 x 104, with the highest expression during early to mid photoperiod. The rbcS qRT-PCR assay is useful for the detection and enumeration of low concentrations of P. multiseries in the environment.
Subjects/Keywords: Pseudo-nitzschia; NASBA; qRT-PCR; harmful algae detection; rbcS; American Studies; Arts and Humanities
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APA (6th Edition):
Delaney, J. A. (2010). Molecular Detection of the Toxic Marine Diatom Pseudo-nitzschia multiseries. (Thesis). University of South Florida. Retrieved from https://scholarcommons.usf.edu/etd/3558
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Delaney, Jennifer A. “Molecular Detection of the Toxic Marine Diatom Pseudo-nitzschia multiseries.” 2010. Thesis, University of South Florida. Accessed January 24, 2021.
https://scholarcommons.usf.edu/etd/3558.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Delaney, Jennifer A. “Molecular Detection of the Toxic Marine Diatom Pseudo-nitzschia multiseries.” 2010. Web. 24 Jan 2021.
Vancouver:
Delaney JA. Molecular Detection of the Toxic Marine Diatom Pseudo-nitzschia multiseries. [Internet] [Thesis]. University of South Florida; 2010. [cited 2021 Jan 24].
Available from: https://scholarcommons.usf.edu/etd/3558.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Delaney JA. Molecular Detection of the Toxic Marine Diatom Pseudo-nitzschia multiseries. [Thesis]. University of South Florida; 2010. Available from: https://scholarcommons.usf.edu/etd/3558
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
The Ohio State University
30.
Mrdjen, Igor.
Harmful Algal Blooms in Small Lakes: Causes, Health Risks,
and Novel Exposure Prevention Strategies.
Degree: PhD, Public Health, 2018, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1531135626251706
► The increasing frequency and severity of harmful algal blooms (HABs) has quickly become an environmental health concern worldwide. As rates of anthropogenic nutrient use rise…
(more)
▼ The increasing frequency and severity of
harmful algal
blooms (HABs) has quickly become an environmental health concern
worldwide. As rates of anthropogenic nutrient use rise with growing
food demand, and as extreme precipitation events are expected to
increase with the changing climate, rates of nutrient influx into
watersheds are expected to increase. With increasing nutrient loads
and temperatures in watersheds, many of the world’s water bodies
and reservoirs are becoming eutrophic, establishing optimal
conditions for HAB formation. HABs may change the ecology of water
bodies; produce hypoxic zones resulting in fish deaths; and produce
cyanotoxin compounds toxic to the liver, nervous system, and
reproductive system of most eukaryotic organisms. Human and animal
exposure to the most commonly occurring cyanotoxin, microcystin
(MC), has been linked with hepatotoxicity, nausea, vomiting, and
death in extreme circumstances. Within the MC family of toxins,
microcystin-LR (MC-LR) is the most common, possesses the highest
toxicity, and is cited as a suspected carcinogen. While HAB
mitigation and MC exposure prevention efforts have often focused on
large lakes and bodies of water, small lakes and ponds (SLaPs)
remain understudied and unmonitored. SLaPs are the most numerous
lentic bodies of water worldwide, providing vital ecosystem
services and biodiversity support. Due to their location, low
volume, and seasonal water level changes, SLaPs are at an increased
risk for eutrophication and HAB formation. SLaPs have many uses
including recreation, aquaculture, irrigation, and even drinking
water sources in economically stressed areas of the world. The
utility of SLaPs presents a potential exposure pathway to HABs and
MC compounds. While our knowledge base of MC-related health
outcomes continues to grow, several gaps exist, including: low
dose, chronic exposure outcomes; differences in toxicity between
pure toxic compounds and crude cyanobacterial extracts; and the
cancer promoting role of MCs. Finally, current satellite-based
remote sensing methods demonstrate several limitations in the study
and monitoring of HAB formation in SLaPs, including: land adjacency
effect contamination, prohibitive costs, and inadequate spatial and
temporal resolutions. The overall goal of this work is to address
the existing knowledge gaps pertaining to HAB appearance in SLaPs,
MC toxicity from chronic and acute exposures, and to improve the
current monitoring methods.
Advisors/Committee Members: Lee, Jiyoung (Advisor).
Subjects/Keywords: Aquatic Sciences; Biology; Environmental Health; Environmental Science; Ecology; Geology; Land Use Planning; Public Health; Remote Sensing; Water Resource Management; harmful algal bloom; microcystin; carcinogenesis; cancer; algae; cyanobacteria; community; tile drainage; drone; UAV; remote sensing; NDVI; toxicity
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mrdjen, I. (2018). Harmful Algal Blooms in Small Lakes: Causes, Health Risks,
and Novel Exposure Prevention Strategies. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1531135626251706
Chicago Manual of Style (16th Edition):
Mrdjen, Igor. “Harmful Algal Blooms in Small Lakes: Causes, Health Risks,
and Novel Exposure Prevention Strategies.” 2018. Doctoral Dissertation, The Ohio State University. Accessed January 24, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1531135626251706.
MLA Handbook (7th Edition):
Mrdjen, Igor. “Harmful Algal Blooms in Small Lakes: Causes, Health Risks,
and Novel Exposure Prevention Strategies.” 2018. Web. 24 Jan 2021.
Vancouver:
Mrdjen I. Harmful Algal Blooms in Small Lakes: Causes, Health Risks,
and Novel Exposure Prevention Strategies. [Internet] [Doctoral dissertation]. The Ohio State University; 2018. [cited 2021 Jan 24].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1531135626251706.
Council of Science Editors:
Mrdjen I. Harmful Algal Blooms in Small Lakes: Causes, Health Risks,
and Novel Exposure Prevention Strategies. [Doctoral Dissertation]. The Ohio State University; 2018. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1531135626251706
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Open Access Theses and Dissertations
