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Author: Vanessa Jane Rose
Publisher:
ISBN:
Category : Cyanobacterial blooms
Languages : en
Pages : 208
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Book Description
Together, eukaryotic algae and prokaryotic cyanobacteria comprise a taxonomically broad group known as phytoplankton that are vital energy producers in aquatic food webs. Cyanobacteria and some algae have the potential to form harmful blooms due to high biomass or production of toxins. Phytoplankton bloom magnitude, timing, and species composition are difficult to predict across freshwater systems because such dynamics are influenced by interacting abiotic and biotic factors, and are further altered by anthropogenic stressors such as climate change and eutrophication. The intent of this research was to explore phytoplankton, and specifically cyanobacterial, bloom dynamics across freshwater systems of the Columbia River (CR) basin, with a focus on growth and assemblage changes in response to biotic and abiotic factors. Key findings included:1.Regionally, chlorophyll a, total phosphorus, modeled dissolved inorganic phosphorus yield, and the land use classes 'developed open space' and 'low intensity' were positively related to cyanobacterial blooms, while water clarity, 'evergreen forest' and 'barren land' were negatively related to blooms. These factors may be useful in predictive modeling and in screening for systems at-risk of developing future blooms.2.Spill of water over run-of-river dams likely has minimal to no effect on the abundance of phytoplankton and microzooplankton above vs. below such dams in the lower CR. 3.Examination of a 14-year dataset from the lower CR revealed three phytoplankton assemblages distinct to spring/summer, fall, and winter seasons, with notable associations between the fall cyanobacteria/chlorophyte assemblage and elevated temperature and invasive zooplanktonic taxa. 4.The addition of nutrients and zooplankton grazers to the natural phytoplankton assemblage collected from western Washington lakes affected phytoplankton net growth rates in lakes of a low, but not high, trophic state. Collectively, these results underscore the variable effects that abiotic and biotic factors may have on phytoplankton blooms. These findings further highlight the regional importance of phosphorus in the occurrence of cyanobacterial blooms, the connections between invasive zooplankton taxa, warm water temperatures, and cyanobacteria-dominated assemblages in the CR, and the importance of lake trophic state in phytoplankton response to future nutrient enrichment.
Author: Vanessa Jane Rose
Publisher:
ISBN:
Category : Cyanobacterial blooms
Languages : en
Pages : 208
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Book Description
Together, eukaryotic algae and prokaryotic cyanobacteria comprise a taxonomically broad group known as phytoplankton that are vital energy producers in aquatic food webs. Cyanobacteria and some algae have the potential to form harmful blooms due to high biomass or production of toxins. Phytoplankton bloom magnitude, timing, and species composition are difficult to predict across freshwater systems because such dynamics are influenced by interacting abiotic and biotic factors, and are further altered by anthropogenic stressors such as climate change and eutrophication. The intent of this research was to explore phytoplankton, and specifically cyanobacterial, bloom dynamics across freshwater systems of the Columbia River (CR) basin, with a focus on growth and assemblage changes in response to biotic and abiotic factors. Key findings included:1.Regionally, chlorophyll a, total phosphorus, modeled dissolved inorganic phosphorus yield, and the land use classes 'developed open space' and 'low intensity' were positively related to cyanobacterial blooms, while water clarity, 'evergreen forest' and 'barren land' were negatively related to blooms. These factors may be useful in predictive modeling and in screening for systems at-risk of developing future blooms.2.Spill of water over run-of-river dams likely has minimal to no effect on the abundance of phytoplankton and microzooplankton above vs. below such dams in the lower CR. 3.Examination of a 14-year dataset from the lower CR revealed three phytoplankton assemblages distinct to spring/summer, fall, and winter seasons, with notable associations between the fall cyanobacteria/chlorophyte assemblage and elevated temperature and invasive zooplanktonic taxa. 4.The addition of nutrients and zooplankton grazers to the natural phytoplankton assemblage collected from western Washington lakes affected phytoplankton net growth rates in lakes of a low, but not high, trophic state. Collectively, these results underscore the variable effects that abiotic and biotic factors may have on phytoplankton blooms. These findings further highlight the regional importance of phosphorus in the occurrence of cyanobacterial blooms, the connections between invasive zooplankton taxa, warm water temperatures, and cyanobacteria-dominated assemblages in the CR, and the importance of lake trophic state in phytoplankton response to future nutrient enrichment.
Author: Tammy Anne Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 175
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Book Description
Occurrences of cyanobacterial blooms are in freshwater systems are increasing in frequency and intensity largely in response to urbanization of landscapes, eutrophication, and climate change. Cyanobacterial blooms negatively affect water quality which leads to a broad range of environmental, social, and economic concerns. In particular, cyanobacteria are known to produce a suite of toxins that have been linked to changes to the aquatic food web, small animal mortality and illness, and adverse health risks to humans. Vancouver Lake, located in southwest Washington state, is a tidally influenced shallow freshwater lake that exhibits annual summer cyanobacterial blooms that have been an on-going concern for public health and natural resource managers. Thus, the purpose of this project was to investigate the biotic and abiotic interactions associated with bloom events in a shallow, freshwater system. The main objectives were: 1) analyze phytoplankton community dynamics with an emphasis on the cyanobacterial community in relation to water quality factors; 2) identify and quantify toxin producing cyanobacterial populations in relation to water quality factors; 3) assess the potential effects of cyanobacterial blooms on zooplankton community dynamics; and 4) develop a model on the potential effects of wind-driven waves on internal phosphorus loading as a potential mechanism contributing to seasonal cyanobacterial blooms. Our findings suggest that nutrients, dissolved inorganic nitrogen and dissolved inorganic phosphorus, significantly influence cyanobacterial blooms dynamics, and more specifically with toxin producing cyanobacteria. In relation to zooplankton community dynamics, we found that while cyanobacterial blooms may have some influence, but also non-native invasive crustacean zooplankton may interact with cyanobacterial blooms affecting the summer zooplankton community. In spite of Vancouver Lake being a model large shallow lake highly susceptible to wind driven sediment resuspension, simulations of seasonal orthophosphate availability did not support observed measurements, suggesting other mechanisms such as redox related processes and bioturbation, should be examined in assessing potential management considerations for restoring Vancouver Lake.
Author: H. Kenneth Hudnell
Publisher: Springer Science & Business Media
ISBN: 0387758658
Category : Medical
Languages : en
Pages : 955
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Book Description
With the ever-increasing incidence of harmful cyanobacterial algal blooms, this monograph has added urgency and will be essential reading for all sorts of researchers, from neuroscientists to cancer research specialists. The volume contains the proceedings of the 2005 International Symposium on Cyanobacterial Harmful Algal Blooms, and has been edited by H. Kenneth Hudnell, of the US Environmental Protection Agency. It contains much of the most recent research into the subject.
Author: Elisabeth (Savi) Vardaka
Publisher: MDPI
ISBN: 3039435051
Category : Science
Languages : en
Pages : 202
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Book Description
Cyanobacterial blooms are a water quality problem that is widely acknowledged to have detrimental ecological and economic effects in drinking and recreational water supplies and fisheries. There is increasing evidence that cyanobacterial blooms have increased globally and are likely to expand in water resources as a result of climate change. Of most concern are cyanotoxins, along with the mechanisms that induce their release and determine their fate in the aquatic environment. These secondary metabolites pose a potential hazard to human health and agricultural and aquaculture products that are intended for animal and human consumption; therefore, strict and reliable control of cyanotoxins is crucial for assessing risk. In this direction, a deeper understanding of the mechanisms that determine cyanobacterial bloom structure and toxin production has become the target of management practices. This Special Issue, entitled “Advancing Knowledge on Cyanobacterial Blooms in Freshwaters”, aims to bring together recent multi- and interdisciplinary research, from the field to the laboratory and back again, driven by working hypotheses based on any aspect of mitigating cyanobacterial blooms, from ecological theory to applied research.
Author: Babin, Marcel
Publisher: UNESCO
ISBN: 9231040421
Category : Nature
Languages : en
Pages : 880
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Book Description
The proliferation of harmful phytoplankton in marine ecosystems can cause massive fish kills, contaminate seafood with toxins, impact local and regional economies and dramatically affect ecological balance. Real-time observations are essential for effective short-term operational forecasting, but observation and modelling systems are still being developed. This volume provides guidance for developing real-time and near real-time sensing systems for observing and predicting plankton dynamics, including harmful algal blooms, in coastal waters. The underlying theory is explained and current trends in research and monitoring are discussed.Topics covered include: coastal ecosystems and dynamics of harmful algal blooms; theory and practical applications of in situ and remotely sensed optical detection of microalgal distributions and composition; theory and practical applications of in situ biological and chemical sensors for targeted species and toxin detection; integrated observing systems and platforms for detection; diagnostic and predictive modelling of ecosystems and harmful algal blooms, including data assimilation techniques; observational needs for the public and government; and future directions for research and operations.
Author: Valentina Muñoz Ramos
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"Missisquoi Bay (MB) is a temperate eutrophic freshwater ecosystem located in an agricultural watershed and it frequently experiences toxic Microcystis-dominated cyanobacterial blooms. Cyanobacterial population dynamics are influenced by a plethora of factors that may differ from system to system, requiring a site-specific assessment of bloom-promoting factors to design more effective bloom prevention or remediation strategies. This is the first biomonitoring study that combined data from high-throughput 16S rRNA gene amplicon sequencing, qPCR and environmental parameters from temporal and spatial samples to identify the main bloom-promoting factors. In addition, high-throughput amplicon sequencing of mitochondrial DNA genes was performed to qualitatively identify potential external sources of nutrients originating from animal excreta. Particular emphasis was placed on 1) determining whether there was a link between nutrients from external sources and cyanobacterial blooms and 2) analyzing in situ the effect of environmental factors (particularly nitrogen (N) and phosphorus (P) concentrations) on the dynamics of cyanobacterial community composition, abundance and toxicity.The concentrations of total P (TP) and total N (TN) in MB in 2009 correlated significantly with the abundance of total cyanobacterial cells, the Microcystis 16S rRNA and mcyD genes and intracellular microcystin. The results suggest that external sources of nutrients, such as surface runoff and animal excreta, played a significant role in the load of nutrients into the bay and thus in the proliferation of toxic cyanobacterial blooms. This was indicated by the detection of non-aquatic mitochondrial DNA hosts in the bay and the relationships between the pattern of surface runoff, nutrient concentrations, E. coli counts and total cyanobacterial abundance. Potential sources of nutrients from non-aquatic animal excreta in the system comprised rodents, birds, cattle and humans, indicating that efforts are required to control pollution from animal excreta in MB. During the growing season, the major cyanobacterial taxa were members of the orders Chroococcales and Nostocales. The genus Microcystis was identified as the main mcyD-carrier and main microcystin producer, hence the most problematic taxon in the cyanobacterial bloom. The correlations observed with environmental parameters suggest that increasing nutrient concentrations and TN:TP (mass) ratios approaching 11:1, coupled with an increase in temperature, promoted Microcystis-dominated toxic cyanobacterial blooms. Although the importance of nutrient ratios and absolute concentrations on cyanobacterial and Microcystis dynamics has been documented, this is the first time that an optimum TN:TP ratio for Microcystis dominance has been observed in the field. This observation provides further support to the theory that nutrient supply ratios are an important determinant of species composition in natural phytoplankton assemblages. Although the validity and prediction potential of this optimum ratio for Microcystis dominance has yet to be verified through longer-term studies, it may provide practical guidelines for nutrient management strategies to avoid the proliferation of this toxin producing cyanobacterial genus in MB. " --
Author: Valerie Rapp
Publisher: Twenty-First Century Books
ISBN: 9780822521365
Category : Juvenile Nonfiction
Languages : en
Pages : 80
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Book Description
Using the Columbian River Basin as an example, explores the ecosystems of rivers of all sizes in mountains and valleys, and discusses the impact of human interaction.
Author: Stephen A. Bortone
Publisher: CRC Press
ISBN: 1420038184
Category : Nature
Languages : en
Pages : 559
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Book Description
Acknowledging the present inability to determine objectively the status and trends among estuarine ecosystems, the environmental research community has recently stepped up efforts to develop and evaluate meaningful estuarine indicators. This goal requires the effort of researchers from a broad spectrum of disciplines. In order to expedite this init
Author: Andrew David Schwartz
Publisher:
ISBN:
Category : Bioinformatics
Languages : en
Pages : 100
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Book Description
Freshwater cyanobacterial blooms are a nuisance and health threat in the Pacific Northwest. The accepted methods of characterizing these blooms by microscopic cell counts cannot differentiate between toxic and non-toxic strains of the cyanobacterium Microcystis. Also, there is limited understanding of freshwater cyanophage that may control bloom dynamics. In order to better understand the cyanobacterial and cyanophage populations of the Klamath River, two studies were conducted. Methods in the studies were largely composed of bioinformatic techniques. First, using clone libraries to genetically track the Microcystis blooms, we found a distinct separation in bloom populations according to whether the toxin microcystin could be produced. The genotypic differences in two bloom cycles were parsed into a graphical representation, useful for describing many closely related organisms. Further investigation of the bloom community led to the isolation of the novel, freshwater Synechococcus-infecting myophage, S-CRM01. The phage is very similar in gene content to marine cyanomyophage, but differs in synteny and nucleotide composition. The bioinformatic techniques used that were either developed or customized to fit our data. Our findings indicate that the use of bioinformatic techniques will greatly increase the resolution of population and genomic studies in freshwater environments. This is apparent in the population differentiation seen throughout the bloom season in the Copco Reservoir as well as the comparative genomics of phage S-CRM01. The results of the research support the use of bioinformatics to acquire and interpret genetic data for cyanobacteria and cyanophage.
Author: Yana Yankova
Publisher:
ISBN:
Category :
Languages : en
Pages :
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