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The Estuary As A Filter

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The Estuary As A Filter

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Author : Victor S Kennedy
language : en
Publisher: Elsevier
Release Date : 2013-09-25

The Estuary As A Filter written by Victor S Kennedy and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-09-25 with Science categories.

The Estuary as a Filter contains the proceedings of the Estuarine Research Federation’s seventh biennial conference at Virginia Beach, Virginia, in late October, 1983. In five invited sessions, scientists and managers considered the physical, geological, chemical-geochemical, and biological processes involved in the ""filtering"" role of estuaries and reflected on management implications of these matters. Most of their presentations and reflections are included in this book in order to demonstrate what is known and what needs to be explored further. The papers in this volume are grouped as they were presented at the conference. Thus, physical oceanographers begin the work by considering turbulence, mixing, and circulation processes in estuaries. Geologists then examine estuarine sedimentation, including the roles of flocculation and bioturbation in accelerating this process. Chemists and geochemists describe the interactions among and effects of inputs of nutrients, metals, and organic matter into estuaries, and the fate of radionuclides in these systems. Biological and biochemical processes involving surface foam, microbes, sea grasses, and wetlands are considered, along with carefully derived nutrient budgets of selected estuarine regions. Finally, some of the problems facing managers of estuarine ecosystems in three areas of the United States are described, along with the success story of the ongoing rehabilitation of the Thames Estuary in England.

Selected Water Resources Abstracts

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Author :
language : en
Publisher:
Release Date : 1988

Selected Water Resources Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Hydrology categories.

Trace Metals In The Westerschelde Estuary A Case Study Of A Polluted Partially Anoxic Estuary

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Author : W. Baeyens
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-17

Trace Metals In The Westerschelde Estuary A Case Study Of A Polluted Partially Anoxic Estuary written by W. Baeyens and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-17 with Science categories.

Oceans and lakes are characterized by large residence times and can thus be considered as being in an equilibrium or quasi-equilibrium state. In contrast, estuaries, which constitute the interface between the fresh water and marine ecosystems, are biogeochemically and physically very dynamic. Strong gradients in physical and chemical variables such as temperature, pH, salinity, dissolved oxygen, nutrients, amount and composition of particulates result from the mixing of fresh water and saline end members. These gradients provoke increased biogeochemical processes, generally resulting in a geochemical filter (the area of high turbidity, showing enhanced adsorption-desorption processes) and a biological filter (the area of high plankton activity showing, besides a high uptake of nutrients, a high accumulation of trace metals). Both filters disturb the conservative mixing pattern of the trace metals in an estuary. In addition, four aspects make the Scheldt estuary very unusual and different from other estuaries: the Scheldt is a tide-governed estuary which means larger residence times; the upper estuary receives large inputs of biodegradable organic matter which leads to oxygen depletion in winter and to anoxic conditions in summer; inputs of toxic pollutants occur in the upper estuary by the industrial park of Antwerp; the anoxic zone, the zone of pollutant input and the zone of the turbidity maximum coincide geographically. The Scheldt estuary is thus an ideal field laboratory for the study of biogeochemical processes which do not occur elsewhere, or only partially, to a very low extent or in a specific compartment, i.e. the sediments. More specifically, redox processes involving trace metals, the formation of non-labile metal complexes, and the methylation of mercury occur as a result of anoxic conditions and the high load of organic matter. Several models describing in detail the transport, the sedimentation and the speciation of the trace metals in this well-mixed estuary (all major estuaries in EC countries adjacent to the North Sea or the Atlantic Ocean are well-mixed) are presented in this book. A comparison of the metal concentrations over a 15-year period shows a net reduction of the pollution level.

Ecology Of Estuaries

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Author : Michael J. Kennish
language : en
Publisher: CRC Press
Release Date : 2019-07-23

Ecology Of Estuaries written by Michael J. Kennish and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-07-23 with Science categories.

The principle objective of this book is to review the biological characteristics of estuaries. The volume has been as a text for undergraduates and graduate students as well as reference for scientists conducting research on estuarine systems. And the rapid development of estuarine ecology as a field of scientific inquiry reflects a growing awareness of the immense societal importance of a coastal ecosystem. While the volume of literature on estuaries amassed, scientists deemed it necessary to synthesize the field periodically. Consiquently, several books have been produced in recent years which examine variuous aspects of the disicpline.

Bivalve Filter Feeders

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Author : Richard F. Dame
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29

Bivalve Filter Feeders written by Richard F. Dame and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Science categories.

Bivalve filter-feeding mollusks are important components of coastal ecosystems because they remove large quantities of suspended material from the water and excrete abundant amounts of reactive nutrients. These animals are also major prey for numerous predators including birds, fish, mammals, and invertebrates; furthermore, they are significant food resources for humans. While studies on the organismic and population level have dominated bivalve ecology, the recent focus on the ecosystem roles of filter feeding systems has led to larger-scale investigations. With this approach the specific topics of physiology, grazing, predation, nutrient cycling, physical environment, computer simulation modeling, and environmental management are combined into a meaningful whole.

Selected Water Resources Abstracts

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Author :
language : en
Publisher:
Release Date : 1988

Selected Water Resources Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Water categories.

Estuarine Nutrient Cycling The Influence Of Primary Producers

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Author : Søren Laurentius Nielsen
language : en
Publisher: Springer Science & Business Media
Release Date : 2005-02-08

Estuarine Nutrient Cycling The Influence Of Primary Producers written by Søren Laurentius Nielsen and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-02-08 with Science categories.

It is a well-known fact that eutrophication of coastal waters causes significant changes in the species composition of the primary producers. Usually a shift from an ecosystem dominated by sea grasses or large brown algae to an ecosystem dominated by fast-growing green algae or phytoplankton is observed. While this shift has been documented in a number of research papers and books, the consequences of this shift are less well known. This book focuses on the consequences of such changes for nutrient cycling. The aim is to investigate how different types of primary producers influence nutrient cycling in coastal marine waters, and how nutrient cycling changes qualitatively and quantitatively as a consequence of the changes in the primary producer community caused by eutrophication. The various chapters address specific ecological processes such as grazing, decomposition, burial and export of biomass from the ecosystem. The book is intended for researchers and professionals working in the field of coastal marine ecology and estuarine ecology and for advanced students in this field.