Download or read book Changes of water quality and sediment phosphorus of a small productive lake following decreased phosphorus loading written by S I. Heaney and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water Quality Hydrology and the Effects of Changes in Phosphorus Loading to Pike Lake Washington County Wisconsin with Special Emphasis on Inlet to outlet Short circuiting written by William J. Rose and published by . This book was released on 2004 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water Quality and the Effects of Changes in Phosphorus Loading to Muskellunge Lake Vilas County Wisconsin written by Dale M. Robertson and published by . This book was released on 2003 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Ecology of Cyanobacteria written by B.A. Whitton and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Restoration Ecology written by Jelte van Andel and published by John Wiley & Sons. This book was released on 2009-03-12 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aimed at Masters, and PhD students, teachers, researchers andnatural resource managers, this book explores the interface betweenrestoration ecology and ecological restoration. Covers both the ecological concepts involved in restorationecology and their practical applications. Written by an excellent group of ecologists from centres acrossEurope with a strong reputation for restoration ecology. Only textbook around aimed specifically at advancedundergraduate courses and postgraduate study programmes.

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 Report of the Institute of Freshwater Ecology written by Institute of Freshwater Ecology (Great Britain) and published by . This book was released on 1990 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Limnology written by and published by . This book was released on 1964 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Phosphorus Dymanics in the Sediment of a Eutrophic Lake written by A. J. C. Sinke and published by . This book was released on 1992 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the sixties eutrophication has been recognized to affect the quality of surface waters. The prolonged loading with nutrients has led to high algal concentrations in the water and to concommitant environmental problems such as the depletion of oxygen, the production of toxins and the development of tedious animal populations e.g. bream. A series of management measures have been carried out to combat eutrophication in the Netherlands. However, despite all efforts, the majority of the dutch surface waters is still considered to be eutrophic. The disappointing results are often attributed to processes in the sediment that can delay the improvement of the water quality. This thesis deals with the phosphorus dynamics in the sediment of an eutrophic lake. In contrast to most studies which are chemically orientated, attention here is mainly given to the role of microbial processes in the phosphorus cycle. The research was performed in eutrophic Lake Loosdrecht where the external phosphorus loading was recently decreased from 35-40 to 10-15 mmol.m-2.y-1. The importance of microbial processes for the release of phosphate by the sediment was investigated by comparing sterilized and non-sterilized columns (chapter 2). Columns were sterilized by -irradiation (25 kGy). The combination of temperature and -irradiation experiments made it possible to distinguish between microbial and physico-chemical processes. The release of dissolved phosphate from the sediment is controlled by microbial processes on a short-term and a long-term basis. Microbial mediated release responds directly on an increase in temperature. This is probably due to the induction of changes in the chemical environment such as a decrease in oxygen content of the surface layer. Mineralization of organic matter results in a mobilization of phosphate and is prerequisite to sustain the phosphate release on a long-term basis. Phosphate fluxes over the sediment-water interface were calculated using measured concentration gradients in the pore water and were compared to fluxes measured under laboratory conditions (chapter 3). Results were analysed with a statistical method (Redundancy Analysis) to detect patterns of variation in pore water chemistry and in measured and calculated fluxes, that could be ascribed to environmental variables. Initial fluxes of phosphate measured in sediment columns, which varied between -7.7 and 1330 mol.m-2 .d-1, correlated significantly with the calculated fluxes over the diment-water interface. The high correlation between calculated fluxes of ammonia, phosphate and methane and measured initial flux of phosphate, conclusively pointed to mineralization of organic matter as driving force for phosphate release from the sediment. Redundancy Analysis demonstrated that the rates of mineralization and of phosphate release are high in autumn. This was ascribed to an increased sedimentation at the end of the growing season. The importance of anaerobic mineralization processes fluctuated seasonally (chapter 4). At high anaerobic mineralization rates (> 600 mol organic carbon M-2 h-1), sulfate reduction was limited by sulfate and methanogenesis accounted for over 80% of the total. At low anaerobic mineralization rates, measured in winter and spring, sulfate reduction was predominant. There was little methanogenesis below 5 cm depth in the sediment which indicated a rapid decrease of degradable organic matter with depth. A new method was develloped to quantify the contribution of bacterial processes to the phosphate uptake of aerobic freshwater sediment (chapter 5). The method was tested on iron hydroxyphosphate that was either synthesized or formed under in situ conditions, and a pure culture of Acinetobacter 210 A. Using a mild acid extraction we could distinguish between chemical and biological phosphate uptake. This method allowed the solubilization of the entire iron hydroxyphosphate fraction but did not extract bacterial phosphate. The method was applied to determine the contribution of bacterial processes to the phosphate uptake of the surface sediment. Phosphate uptake of randomly sampled surface layers of the sediment was considerable and ranged from 12 to 138 mol.g-1 on a dry weight basis. Phosphate uptake was correlated positively with the amount of extractable iron and phosphate and negatively with dry weight. The contribution of bacterial processes ranged from 12 to 32 %. Addition of an easily degradable substrate, such as acetate, to the sediment stimulated the uptake of phosphate and augmented the biologically bound phosphate fraction. A diffusion chamber was designed to investigate the effect of an enhanced oxygen consumption of the surface sediment on the phosphate flux (chapter 6). The diffusion chamber consisted of two compartments separated by a Teflon membrane. In the upper part a thin sediment layer was present and the lower part was continuously flushed with gas. The hydrophobic membrane allowed for diffusion of gasses from the lower part through the sediment layer towards the headspace of the upper part. In the diffusion chambers the methane oxidation was artifically increased to 9.8 mmol.m-2.d-1. This resulted in an increase of the oxygen consumption rate by a factor two compared to controls without methane oxidation (8.6 vs 17.7 mmol.m-2.d-1). The methane oxidation significantly decreased the oxygen penetration depth (2.5-4.0 vs 1.0-2.0 mm). However, despite the shrinkage of the oxidized microlayer, no differences were found in phosphate flux over the sediment water interface. Batch experiments with standard additions of methane revealed that the growth of methanotrophic bacteria contributes to the phosphate uptake of aerobic sediment. Results indicated that a decrease in chemical phosphate adsorption caused by a decease in the oxygen penetration depth, could be compensated for entirely by the growth of methanotrophic bacteria. Finally it was concluded that the eutrophic conditions in Lake Loosdrecht are maintained by a relatively small but dynamic pool of phosphate (chapter 7). Calculations with a simple model indicated that restoration measures such as dredging or addition of iron(III) compounds will not result in a long-term improvement of the water quality. The construction of isles and dikes might induce a decrease in turbulence and thus contribute to an improvement of the water quality. A further reduction of the external phosphorus loading is prerequisite to reduce the amount of phosphorus compounds in the water. However, the changes in the structure of the ecosystem that have been induced by the eutrophication might be irreversible. Whether Lake Loosdrecht can be restorated into a clear water system dominated by macrophyts depen on ecological interactions between bacteria, algae, zooplankton and fish in the ecosystem but is impossible to predict.

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 Australian Journal of Marine and Freshwater Research written by and published by . This book was released on 1994 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Review of Phosphorus Control Measures in the United States and Their Effects on Water Quality written by David W. Litke and published by . This book was released on 1999 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water Quality Hydrology and the Effects of Changes in Phosphorus Loading to Pike Lake Washington County Wisconsin with Special Emphasis on Inlet to outlet Short circuiting written by William J. Rose and published by . This book was released on 2004 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of Phosphate Resources in Southeastern Idaho written by Geological Survey (U.S.). Lead Bureau and published by . This book was released on 1977 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Some English Lakes as Diverse and Active Ecosystems written by K. M. Atkinson and published by . This book was released on 1999 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Encyclopedia of Biodiversity written by and published by Academic Press. This book was released on 2013-02-05 with total page 5485 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 7-volume Encyclopedia of Biodiversity, Second Edition maintains the reputation of the highly regarded original, presenting the most current information available in this globally crucial area of research and study. It brings together the dimensions of biodiversity and examines both the services it provides and the measures to protect it. Major themes of the work include the evolution of biodiversity, systems for classifying and defining biodiversity, ecological patterns and theories of biodiversity, and an assessment of contemporary patterns and trends in biodiversity. The science of biodiversity has become the science of our future. It is an interdisciplinary field spanning areas of both physical and life sciences. Our awareness of the loss of biodiversity has brought a long overdue appreciation of the magnitude of this loss and a determination to develop the tools to protect our future. Second edition includes over 100 new articles and 226 updated articles covering this multidisciplinary field— from evolution to habits to economics, in 7 volumes The editors of this edition are all well respected, instantly recognizable academics operating at the top of their respective fields in biodiversity research; readers can be assured that they are reading material that has been meticulously checked and reviewed by experts Approximately 1,800 figures and 350 tables complement the text, and more than 3,000 glossary entries explain key terms