Download or read book The Role of Iron in Suppressing Internal Phosphorus Loading and Toxic Cyanobacterial Blooms in Freshwater Lakes written by Diane Michelle Orihel and published by . This book was released on 2013 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Harmful algal blooms occur in nutrient-rich lakes around the world, diminishing the value of these ecosystems for wildlife and humans. Management of algal blooms is an on-going challenge for lake managers and policy makers. The overarching goal of this research was to advance our understanding of the environmental factors leading to blooms of potentially toxic cyanobacteria in shallow eutrophic lakes, in order to guide effective management strategies to reduce their occurrence. First, I evaluated the nutrient conditions that lead to elevated levels of microcystins, a hepatotoxin produced by certain cyanobacteria, by consolidating a national database of nutrient and microcystin concentrations for Canadian lakes. Second, I tested whether nutrients released from sediments stimulate toxic cyanobacterial blooms by culturing the cyanobacterium Microcystis in overlying water harvested from incubated lake sediments. Third, I developed and evaluated a conceptual model to explain the biogeochemical pathways leading to toxic cyanobacterial blooms in shallow lakes, based on sediment and culture experiments and lake monitoring in a hypereutophic lake in Alberta, Canada. Fourth, I tested this conceptual model experimentally by manipulating iron loading to in-lake mesocosms and examining changes in sediment chemistry, nutrient cycling, algal biomass and community composition, and microcystin concentrations. The main conclusions of these studies are: (i) microcystins are prevalent in lakes across Canada, but only under high nutrient conditions and at low ratios of nitrogen-to-phosphorus; (ii) lake sediments release bioavailable nutrients that support the growth and toxin production of microcystin-producing cyanobacteria; (iii) toxic blooms of cyanobacteria in shallow lakes may result from the synergy between iron-deficient sediments and discontinuous polymixis; (iv) iron loading to lakes inhibits internal phosphorus loading, decreases algal biomass, discourages the dominance of cyanobacteria, and reduces microcystin concentrations. This research reaffirms the need for controlling internal phosphorus loading in shallow lakes of the Canadian Prairies, and suggests iron treatment may be an effective remediation strategy to complement external nutrient loading reductions. More broadly, this research emphasizes the important role of iron in influencing the trophic status of lakes, and raises concerns for how sulfur pollution and climate change may be exacerbating the problem of lake eutrophication.
Download or read book Lake Functioning written by Gertrud K. Nürnberg and published by CRC Press. This book was released on 2024-10-10 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the interconnections of internal phosphorus loading, cyanobacteria, and climate change and their role in determining water quality in freshwater. It goes on to discuss the sometimes elusive process of internal phosphorus loading with its chemical and biological roots. Reviewing recent observations on present and future climate change, the book explores its effects on lake functioning. It concludes with the abatement and prevention of cyanobacteria proliferation, including techniques that deal with internal phosphorus loading. Some key topics covered are: In-depth exploration of internal phosphorus loading and its quantification in global lakes with diverse morphometry, hydrology, geochemistry, and degree of eutrophication. Determination of climate change effects on physical, chemical, and cyanobacteria-related variables in tables based on more than 100 reviewed journal articles. Evidence for the enhancing influences of climate change on internal phosphorus load and cyanobacteria, and of internal load on cyanobacteria. This book will be of interest to limnologists, environmental and engineering professionals, and natural science students. It will also be an interesting read to government agents, lake managers, and others interested in maintaining lake water quality and understanding algal blooms.
Download or read book Lake Functioning written by Gertrud K Neurnberg and published by . This book was released on 2024-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book explores the interconnections of internal phosphorus loading, cyanobacteria, and climate change and their role in determining water quality in freshwater. It goes on to discuss the sometimes-elusive process of internal phosphorus loading with its chemical and biological roots. Reviewing recent observations on present and future climate change, the book explores its effects on lake functioning. It concludes with the abatement and prevention of cyanobacteria proliferation, including techniques that deal with internal phosphorus loading. Some key topics covered are: In-depth exploration of internal phosphorus loading and its quantification in global lakes with diverse morphometry, hydrology, trophic state, and eutrophication. Determination of climate change effects on physical, chemical, and cyanobacteria-related variables in tables based on more than 100 reviewed journal articles. Evidence for the enhancing influences of climate change on internal phosphorus load and cyanobacteria, and of internal load on cyanobacteria. This book will be of interest to limnologist, environmental and engineering professionals, and natural science students. It will also be an interesting read to government agents and lake managers"--
Download or read book Lake Functioning written by Gertrud K. Nurnberg and published by CRC Press. This book was released on 2024-10-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the interconnections of internal phosphorus loading, cyanobacteria, and climate change and their role in determining water quality in freshwater.
Download or read book Internal Loading of Nitrogen N and Phosphorus P Reduced N Forms and Periodic Mixing Support Cyanobacterial Harmful Algal Blooms HABs in Shallow Eutrophic Honeoye Lake New York USA written by Justin Adam Myers and published by . This book was released on 2021 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cyanobacteria are important primary producers, but large cyanobacterial harmful algal blooms (HABs) have many negative ecological and health impacts and are becoming increasingly common. Honeoye Lake (New York, USA) is a shallow, eutrophic lake characterized by increasingly frequent HABs. Nitrogen (N) and phosphorus (P) loads often drive HABs in lakes, and sediment processes can contribute to N removal (e.g., denitrification) or loading (e.g., N fixation, remineralization). Sediment cores and lake water were collected during May-October (2016-2018) at two sites and incubated with no amendments (controls) or 15N stable isotopes to measure sediment nutrient fluxes and N cycling dynamics in Honeoye Lake. Sediments were a strong source of ammonium (NH4+; 200 ± 56 [mu]mol N m−2 hr−1) and soluble reactive P (SRP; 1.60 ± 0.67 [mu]mol P m−2 hr−1). Internal loading of NH4+ was greater than previous estimates of external and internal TN loads. In situ denitrification (mean 17 ± 7 [mu]mol N m−2 hr−1) was the main N removal pathway but was limited by NO3− availability and a lack of nitrification (mean 0.007 ± 0.002 [mu]mol N L−1 hr−1). Potential dissimilatory nitrate reduction to ammonium rates (DNRA; 30 ± 11 [mu]mol N m−2) suggested sediments may play an important role in internal loading and recycling of N. Water column NH4+ uptake (mean 0.23 ± 0.02 [mu]mol N L−1 hr−1) rates indicated high NH4+ demand, with only 50% of potential uptake being supplied by regeneration (mean 0.11 ± 0.01 [mu]mol N L−1 hr−1) within the water column, while the other 50% can be accounted for from sediment NH4+ loading. Scaling these rates to the whole lake area suggests internal loads of bioavailable N and P are greater than external loads and promote primary productivity and HABs within Honeoye Lake. Shallow lake sediments can be a significant source of reduced N and SRP, which can be mixed periodically supporting HABs. N loads dominated by chemically reduced forms may limit denitrification and favor non-N-fixing cyanobacteria, as well as internal recycling pathways that retain N. An increased focus on reduction of N, along with P, is necessary to prevent increasing cyanobacterial HABs.
Download or read book Climate Change and Marine and Freshwater Toxins written by Luis M. Botana and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-12-16 with total page 669 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasingly widespread production of toxins by marine and freshwater microalgae raises serious concerns regarding seafood and drinking water safety. This book compiles studies on the influence of climate change on the spreading of toxin-producing species in aquatic systems. The chemistry and biology of toxin production is revised and an outlook on control and prevention of the toxins' impact on human and animal health is given.
Download or read book Hypolimnetic Iron written by Jordan D. Bauer and published by . This book was released on 2015 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lake Desair exhibits hypereutrophic conditions and severe summer algal bloom development. A monitoring program was conducted in 2013 to examine phosphorus (P) and chlorophyll dynamics in relation to internal and tributary P loading. The lake strongly stratified and concentrations of both Fe and P increased substantially in the anoxic hypolimnion during the summer. Internal P loading, estimated by mass balance, was high at 10 mg/m2 d and accounted for 32% of the annual P load to the lake. However, physical entrainment of hypolimnetic P into the epilimnion was not detected due to a high hypolimnetic Fe:P ratio (> 5:1 wt:wt), which resulted in complete precipitation and adsorption of P during chemical oxidation rather than algal uptake. Internal P loading, although high, probably does not contribute to the epilimnetic P budget of this lake. Instead, tributary SRP loading from the agriculturally-dominated Northwest Creek watershed is likely the primary P source to the epilimnion and cyanobacterial blooms in the lake. SRP concentrations accounted for over 40% of the load and, therefore, represented a directly available P source for phytoplankton uptake. Thus, best management practices in the watershed should be considered to lower bio-available P concentrations that cause cyanobacteria activity and growth.
Download or read book Internal Phosphorus Loading in Lakes written by Bryan Spears and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nutrient enrichment of lakes is a ubiquitous problem, impacting ecological and human health on a global scale by accelerating the pace of eutrophication, often resulting in algal blooms, depleted dissolved oxygen concentrations, and economic harm to surrounding communities. In many lakes, bed sediments are a major but unrecognized source of phosphorus to the water, a process known as internal phosphorus loading. Internal loading is notoriously difficult to measure and manage given the need to access processes operating on and within the lakebed. In addition, climate change threatens to promote internal loading. For example, warming of lakes can increase the release of phosphorus from sediments due to 1) longer and stronger periods of lake stratification resulting in sediment anoxia and 2) enhanced microbial decomposition of organic matter. Degraded water quality not only impairs ecological health but also can influence social pride and community morale. This is the first book dedicated to the understanding of internal phosphorus loading in lakes and examines the causes, the ecological and societal impacts, and options for managing this complex phenomenon. With contributions from leading experts, this edited volume provides a broad view of internal phosphorus loading, methods for measurement, management practices for water quality improvement, case studies from around the world, and recommendations for addressing this growing concern. It is essential reading for environmental and engineering professionals involved in lake and reservoir management, students and faculty in limnology, state and federal authorities involved in water quality regulation, and lakefront homeowners and management boards interested in maintaining lake water quality and managing algal blooms. Key Features * First-ever comprehensive volume on internal phosphorous loading that clearly details what it is and why it occurs * Identifies and explores the drivers of internal phosphorus loading * Provi
Download or read book Relationship of Hypolimnetic Iron Sediment Biogeochemistry and Sulfate in the Promotion of Cyanobacterial Blooms written by Mark Jason Verschoor and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous work suggests that a high rate of internal ferrous iron (Fe2+) loading from anoxic sediments into overlying waters favours cyanobacteria dominance over eukaryotic algae. This conceptual model was assessed in four embayments along the Georgian Bay coastline. Cyanobacteria dominated all embayments in the relatively warmer summer of 2012 but not in the much cooler summer of 2014; internal Fe2+loading was observed in both summers in all embayments. A large cyanobacteria bloom was observed only in warmer 2012 in the meso-eutrophic embayment. Results show that warm summer temperatures and internal Fe2+ loading are necessary preconditions for cyanobacteria dominance, while large blooms require high nutrient levels. Release of ferrous iron from sediments is restricted by sulfide production via the formation of insoluble ferrous sulfides, which reduces lake iron availability when they are buried in sediments. Increases in ferrous iron due to decreased sulfate levels may explain recent increases in bloom activity within Ontario and Quebec lakes. Sediment cores were collected from Lakes Erie and St. George and analyzed for historical trends in acid-volatile sulfides (AVS) and acid-extractable iron. Lake Erie seemed to closely follow the historical SO2 emission trends of the region, except for an anomaly occurring in the mid 1970s. Neither of the two cores demonstrated a clear historical relationship between acid extractable iron and AVS, although the patterns in Erie are similar. Surficial sediments from Hamilton Harbour and Lake Erie were processed to form sediment incubation cores, which had additions of sulfate and/or organic carbon to determine their effects on the rate of internal loading and production of iron sulfides. The overall results indicate that heterotrophic bacterial metabolism of organic matter is the primary driver of internal loading and subsequent redox-associated events such as sulfide deposition. Soluble iron was not sequestered with even relatively high levels of sulfate until the latest stages anoxia, and it therefore seems unlikely that ferrous iron will be controlled by sulfide production in these natural systems during the course of one season, but long-term sequestration may be more likely after large blooms.
Download or read book Role of Phosphorus in Eutrophication written by Alfred Frank Bartsch and published by . This book was released on 1972 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lake Restoration Handbook written by David P. Hamilton and published by Springer. This book was released on 2019-01-29 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lakes across the globe require help. The Lake Restoration Handbook: A New Zealand Perspective addresses this need through a series of chapters that draw on recent advances in modelling and monitoring tools, citizen science and First Peoples’ roles, catchment and lake-focused restoration techniques, and policy implementation. New Zealand lakes, like lakes across the globe, are subject to multiple pressures that have increased in severity and scale as land use has intensified, invasive species have spread and global climate change becomes manifest. This books builds on the popular Lake Managers Handbook (1987), which provided guidance on undertaking investigations into, and understanding lake ecosystems in New Zealand. The Lake Restoration Handbook: A New Zealand Perspective synthesises contemporary issues related to lake restoration and rehabilitation, integrated with social science and cultural viewpoints, and complemented by authoritative topic-area summaries by renowned scientists and practitioners from across the globe. The book examines the progress of lake restoration and the new and emerging tools available to managers for predicting and effecting change. The book will be a valuable resource for natural and social scientists, policy writers, lake managers, and anyone interested in the health of lake ecosystems.
Download or read book Nutrients in Natural Waters written by Herbert Ellis Allen and published by Wiley-Interscience. This book was released on 1972 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: The latest thinking and research on nutrients have been brought together by experts in the chemical and biological sciences and in engineering. The authors represent educational institutions, government, and industry. The book features a broad discussion of the topic. In addition to chapters on the three principal nutrients (nitrogen, phosphorus, and carbon), chapters on nutrient geochemistry and nutrient regeneration in hypolimnetic waters are included. Both chemical and bioassay analyses of nutrients are discussed by experts in their respective fields. Computer models of nutrient biochemical processes are described with the use of many illustrations, so that even those unfamiliar with computer techniques can appreciate their utility.
Download or read book Cyanobacterial Harmful Algal Blooms State of the Science and Research Needs written by H. Kenneth Hudnell and published by Springer Science & Business Media. This book was released on 2008-03-13 with total page 955 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Eutrophication causes consequences and control written by Abid A. Ansari and published by Springer Science & Business Media. This book was released on 2010-10-17 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Principles of Ecotoxicology Second Edition written by C.H. Walker and published by CRC Press. This book was released on 2003-09-02 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade ecotoxicology has emerged as a distinct subject of interdisciplinary character. Courses in ecotoxicology reflect this and are taught by specialists in chemistry and biochemistry through to population genetics and ecology. As the first textbook to incorporate all relevant aspects of chemistry, biochemistry, toxicology, physiology, population ecology and population genetics, the first edition of this book proved to be well received across several industries. Featuring fully revised text and new illustrations, Principles of Ecotoxicology identifies the major classes of organic and inorganic pollutants, their properties, release and environmental fate, and transport in air, water and along food chains, before considering the effects that they might have upon individual organisms and ultimately whole ecosystems. This timely second edition of Principles of Ecotoxicology incorporates data collected since the first edition on subjects of current research and media interest such as organochloride pesticides, endocrine disruptors, aquatic toxicity, industrial waste and ecotoxicity testing.
Download or read book The Role of Iron in the Phosphorus Cycle in Lakes written by Atal Enerjin Eralp and published by . This book was released on 1973 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Physiology of Microalgae written by Michael A. Borowitzka and published by Springer. This book was released on 2016-03-21 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the state-of-the-art of microalgae physiology and biochemistry (and the several –omics). It serves as a key reference work for those working with microalgae, whether in the lab, the field, or for commercial applications. It is aimed at new entrants into the field (i.e. PhD students) as well as experienced practitioners. It has been over 40 years since the publication of a book on algal physiology. Apart from reviews and chapters no other comprehensive book on this topic has been published. Research on microalgae has expanded enormously since then, as has the commercial exploitation of microalgae. This volume thoroughly deals with the most critical physiological and biochemical processes governing algal growth and production.
