The Ecosystem Effects of Cyanobacteria in Oligotrophic Lakes PDF Download
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Author: Cayelan Christine Carey
Publisher:
ISBN:
Category :
Languages : en
Pages : 335
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Book Description
Cyanobacterial blooms pose a serious threat to the water quality of freshwater lakes because of their scums, toxins, and odors. Synergistic interactions between eutrophication and climate change may be causing cyanobacterial blooms to increase worldwide, which will have substantial consequences for aquatic food webs and nutrient concentrations in lakes. In particular, the trophic state of a lake may be an important determinant of how blooms affect ecosystem functioning. In this dissertation, I used a combination of literature reviews, field surveys, field experiments, and laboratory experiments to examine the causes and effects of cyanobacterial blooms in both oligotrophic and eutrophic freshwater lakes. My research shows that increased nutrients are an important driver of the global increase in cyanobacterial blooms, and future climatic and hydrological conditions may interact to favor cyanobacterial dominance. My experiments with G. echinulata, a cyanobacterium that is increasing in the northeastern United States, demonstrate that high densities of G. echinulata can increase nitrogen and phosphorus concentrations in low nutrient lakes. In these systems, G. echinulata can play an important role structuring food webs by increasing the biomass of small-sized phytoplankton. G. echinulata's interactions with phytoplankton are fairly complex, iii however, as I observed that its positive effects were mediated by both trophic interactions (zooplankton biomass) and trophic state (nutrient concentrations), highlighting the context-dependency of the effect of this species on other plankton. I found that nutrients play an important role mediating G. echinulata's effects on phytoplankton: first, increasing nutrients in the water column may be the mechanism by which G. echinulata stimulate other phytoplankton in oligotrophic systems, and second, nutrient concentrations may alter the direction of G. echinulata's effect (i.e., stimulatory or inhibitory) on other plankton. Finally, my data demonstrate that G. echinulata blooms in oligotrophic lakes may have important consequences for water quality. As cyanobacteria continue to increase, it is vitally important to understand how both oligotrophic and eutrophic systems will respond. iv.
Author: Cayelan Christine Carey
Publisher:
ISBN:
Category :
Languages : en
Pages : 335
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Book Description
Cyanobacterial blooms pose a serious threat to the water quality of freshwater lakes because of their scums, toxins, and odors. Synergistic interactions between eutrophication and climate change may be causing cyanobacterial blooms to increase worldwide, which will have substantial consequences for aquatic food webs and nutrient concentrations in lakes. In particular, the trophic state of a lake may be an important determinant of how blooms affect ecosystem functioning. In this dissertation, I used a combination of literature reviews, field surveys, field experiments, and laboratory experiments to examine the causes and effects of cyanobacterial blooms in both oligotrophic and eutrophic freshwater lakes. My research shows that increased nutrients are an important driver of the global increase in cyanobacterial blooms, and future climatic and hydrological conditions may interact to favor cyanobacterial dominance. My experiments with G. echinulata, a cyanobacterium that is increasing in the northeastern United States, demonstrate that high densities of G. echinulata can increase nitrogen and phosphorus concentrations in low nutrient lakes. In these systems, G. echinulata can play an important role structuring food webs by increasing the biomass of small-sized phytoplankton. G. echinulata's interactions with phytoplankton are fairly complex, iii however, as I observed that its positive effects were mediated by both trophic interactions (zooplankton biomass) and trophic state (nutrient concentrations), highlighting the context-dependency of the effect of this species on other plankton. I found that nutrients play an important role mediating G. echinulata's effects on phytoplankton: first, increasing nutrients in the water column may be the mechanism by which G. echinulata stimulate other phytoplankton in oligotrophic systems, and second, nutrient concentrations may alter the direction of G. echinulata's effect (i.e., stimulatory or inhibitory) on other plankton. Finally, my data demonstrate that G. echinulata blooms in oligotrophic lakes may have important consequences for water quality. As cyanobacteria continue to increase, it is vitally important to understand how both oligotrophic and eutrophic systems will respond. iv.
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: B.A. Whitton
Publisher: Springer Science & Business Media
ISBN: 0306468557
Category : Science
Languages : en
Pages : 718
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Book Description
Cyanobacteria make a major contribution to world photosynthesis and nitrogen fixation, but are also notorious for causing nuisances such as dense and often toxic `blooms' in lakes and the ocean. The Ecology of Cyanobacteria: Their Diversity in Time and Space is the first book to focus solely on ecological aspects of these organisms. Its twenty-two chapters are written by some thirty authors, who are leading experts in their particular subject. The book begins with an overview of the cyanobacteria - or blue-green algae, for those who are not specialists - then looks at their diversity in the geological record and goes on to describe their ecology in present environments where they play important roles. Why is one of the key groups of organisms in the Precambrian still one of the most important groups of phototrophs today? The importance of ecological information for rational management and exploitation of these organisms for commercial and other practical purposes is also assessed. Accounts are provided of nuisances as well as the ecology of the commercially successful Spirulina and the role of cyanobacteria in ecosystem recovery from oil pollution. Many chapters include aspects of physiology, biochemistry, geochemistry and molecular biology where these help general understanding of the subject. In addition there are three chapters dealing specifically with molecular ecology. Thirty-two pages of colour photos incorporate about seventy views and light micrographs. These features make the book valuable to a wide readership, including biologists, microbiologists, geologists, water managers and environmental consultants. The book complements the highly successful The Molecular Biology of Cyanobacteria already published by Kluwer.
Author: Ulrich Sommer
Publisher: Springer Science & Business Media
ISBN: 3642748902
Category : Science
Languages : en
Pages : 378
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Book Description
All relevant ecological aspects of plankton, especially seasonal changes in the species composition, the role of competition for limiting resources in species replacements, the role of parasitism, predation and competition in seasonal succession are treated in detail considering phytoplankton, zooplankton and bacteroplankton. In addition to its use as a valid reference book for plankton ecology, this monograph may well be used as a model for other kinds of ecological communities.
Author: Abid A. Ansari
Publisher: Springer Science & Business Media
ISBN: 9048196256
Category : Technology & Engineering
Languages : en
Pages : 402
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Book Description
Eutrophication continues to be a major global challenge to water quality scientists. The global demand on water resources due to population increases, economic development, and emerging energy development schemes has created new environmental challenges to global sustainability. Eutrophication, causes, consequences, and control provides a current account of many important aspects of the processes of natural and accelerated eutrophication in major aquatic ecosystems around the world. The connections between accelerated eutrophication and climate change, chemical contamination of surface waters, and major environmental and ecological impacts on aquatic ecosystems are discussed. Water quality changes typical of eutrophication events in major climate zones including temperate, tropical, subtropical, and arid regions are included along with current approaches to treat and control increased eutrophication around the world. The book provides many useful new insights to address the challenges of global increases in eutrophication and the increasing threats to biodiversity and water quality.
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: Brian A. Whitton
Publisher: Springer Science & Business Media
ISBN: 9400738552
Category : Science
Languages : en
Pages : 753
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Book Description
Cyanobacteria have existed for 3.5 billion years, yet they are still the most important photosynthetic organisms on the planet for cycling carbon and nitrogen. The ecosystems where they have key roles range from the warmer oceans to many Antarctic sites. They also include dense nuisance growths in nutrient-rich lakes and nitrogen-fixers which aid the fertility of rice-fields and many soils, especially the biological soil crusts of arid regions. Molecular biology has in recent years provided major advances in our understanding of cyanobacterial ecology. Perhaps for more than any other group of organisms, it is possible to see how the ecology, physiology, biochemistry, ultrastructure and molecular biology interact. This all helps to deal with practical problems such as the control of nuisance blooms and the use of cyanobacterial inocula to manage semi-desert soils. Large-scale culture of several organisms, especially "Spirulina" (Arthrospira), for health food and specialist products is increasingly being expanded for a much wider range of uses. In view of their probable contribution to past oil deposits, much attention is currently focused on their potential as a source of biofuel. Please visit http://extras.springer.com/ to view Extra Materials belonging to this volume. This book complements the highly successful Ecology of Cyanobacteria and integrates the discoveries of the past twelve years with the older literature.
Author:
Publisher: Academic Press
ISBN: 0080526942
Category : Science
Languages : en
Pages : 781
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Book Description
Algae are an important component of aquatic benthic ecosystems because they reflect the health of their environment through their density, abundance, and diversity. This comprehensive and authoritative text is divided into three sections to offer complete coverage of the discussion in this field. The first section introduces the locations of benthic algae in different ecosystems, like streams, large rivers, lakes, and other aquatic habitats. The second section is devoted to the various factors, both biotic and abiotic, that affect benthic freshwater algae. The final section of the book focuses on the role played by algae in a variety of complex freshwater ecosystems. As concern over environmental health escalates, the keystone and pivotal role played by algae is becoming more apparent. This volume in the Aquatic Ecology Series represents an important compilation of the latest research on the crucial niche occupied by algae in aquatic ecosystems. - Presents algae as the important player in relation to environmental health - Prepared by leading authorities in the field - Includes comprehensive treatment of the functions of benthic algae as well as the factors that affect these important aquatic organisms - Acts as an important reference for anyone interested in understanding and managing freshwater ecosystems
Author: Gertraud Hötzel
Publisher:
ISBN: 9780642267719
Category : Freshwater phytoplankton
Languages : en
Pages : 58
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Book Description
Author: Abid A. Ansari
Publisher: Springer Science & Business Media
ISBN: 9400778147
Category : Technology & Engineering
Languages : en
Pages : 264
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Book Description
Eutrophication continues to be a major global challenge and the problem of eutrophication and availability of freshwater for human consumption is an essential ecological issue. The global demand for water resources due to increasing population, economic developments, and emerging energy development schemes has created new environmental challenges for global sustainability. Accordingly, the area of research on eutrophication has expanded considerably in recent years. Eutrophication, acidification and contamination by toxic substances are likely to pose increasing threats to freshwater resources and ecosystems. The consequences of anthropogenic-induced eutrophication of freshwaters are severe deterioration of surface waters and growing public concern, as well as new interest among the scientific community. “Eutrophication: causes, consequences & control” provides the latest information on many important aspects of the processes of natural and accelerated eutrophication in major aquatic ecosystems around the world. This book offers a cutting-edge resource for researchers and students alike who are studying eutrophication in various ecosystems. It presents the latest trends and developments in the field, including: global scenarios and local threats to the dynamics of aquatic ecosystems, economics of eutrophication, eutrophication in the great lakes of the Chinese pacific drainage basin, photoautotrophic productivity in eutrophic ecosystems, eutrophication’s impacts on natural metal remediation in salt marshes, phytoplankton assemblages as an indicator of water quality in seven temperate estuarine lakes in southeast Australia, biogeochemical indicators of nutrient enrichments in wetlands – the microbial response as a sensitive indicator of wetland eutrophication, and ultraviolet radiation and bromide as limiting factors in eutrophication processes in semi-arid climate zones. Written by respected experts and featuring helpful illustrations and photographs, “Eutrophication: causes, consequences & control” provides a concise and practical update on the latest developments in eutrophication.
