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This digital document is a journal article from Journal of Experimental Marine Biology and Ecology, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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Macrobenthic invertebrates are an important food source for higher trophic levels in freshwater and marine habitats, yet the importance of predation impacting regular seasonal changes in macrobenthos abundance remains unclear. Benthic invertebrates and transient marine species in temperate estuaries display inverse patterns of seasonal abundance, suggesting a link between predation and summer macrobenthos abundance minima. We conducted manipulative caging experiments to test the importance of predation by white shrimp (Litopenaeus setiferus) in regulating estuarine subtidal macrobenthos densities. We predicted greater declines in macrobenthos densities with increased shrimp densities due to predation rather than disturbance and macrobenthos emigration. Using these field and laboratory data, we estimate whether white shrimp predation can significantly contribute to the macrobenthos seasonal abundance minima observed in long-term monitoring data. White shrimp predation was measured in the field using 7-d predator enclosure/exclusion experiments. Within the uppermost 0-2 cm of sediment, total macrobenthos densities decreased within shrimp enclosure cages using 12 or 36 shrimp m^-^2. Laboratory experiments distinguished between the effects of shrimp predation versus shrimp disturbance and macrobenthos emigration. Shrimp predation significantly reduced macrobenthos densities, while effects of shrimp disturbance and macrobenthos emigration were not significant in these experiments. Despite the impacts from other ambient predators and other abiotic factors, white shrimp were clearly capable of driving subtidal macrobenthos from their annual maximum density in winter/spring to their summertime minimum density. ... Read more

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Publisher: [Washington, D.C. : NOAA Office of Coastal Resource Management, Sanctuaries and Reserves Division]Publication date: 1992Subjects: Estuarine ecology -- California Tijuana River EstuaryNotes: This is an OCR reprint. There may be numerous typos or missing text. There are no illustrations or indexes.When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. You can also preview the book there. ... Read more

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This text on estuarine ecology should be of interest to marine ecologists, environmental scientists/engineers, planners, environmentalists and conservationists. ... Read more

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This book focuses on the principal components of an estuary. Although each chapter contains rigorous specialist knowledge, it is presented in an accessible way that encourages multi-disciplinary collaboration between such fields as hydrology, ecology and mathematical modeling.

Estuarine Ecohydrology demonstrates how one can quantify an estuarine ecosystem's ability to cope with human stresses. The theories, models, and real-world solutions presented will serve as a toolkit for designing a management plan for the ecologically sustainable development of an estuary.

* Appropriate for use as a textbook and as a reference
* Focuses on the principal components of an estuary
* Presents theories, models, and real-world solutions to serve as a toolkit for designing a management plan for the ecologically sustainable development of an estuary ... Read more

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Estuaries, bays and contiguous coastal seas are the world's most valuable, and yet most vulnerable marine ecosystems. Fundamental to the protection and management of these important resources is an understand- ing of the physical processes involved which affect the circulation, mixing, and transport of salt, nutrients and sediment. Residual Currents and Long-Term Transport processes appear to have direct control over freshwater inflows, contaminant loadings, dispersion and transport of sediments and nutrients, and causes of declining living resources. This volume provides a comprehensive and up-to-date summary of the research results on these processes in estuaries and bays. Contributions from ten countries include results based on theoretical formulations, analyses of field data, numerical models and case studies. ... Read more

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The Chernobyl accident drew attention to the difficulties of understanding the dynamics of radionuclide transport through the environment using older methods developed after the pseudo steady state pollution resulting after the weapons testing fallout. More recent approaches, which are reported in this book, have incorporated both the dynamic aspects highlighted by the pulse Chernobyl input and the importance of improvement in models that can be brought about by constraining parameters on the basis of a knowledge of the fundamental physics, chemistry, biology and ecology of the ecosystems involved. The papers within this volume include hydrodynamic models of suspended solids transport, ion exchange interpretation of radionuclide sorption: approaches applying a knowledge of membrane transport kinetics to the uptake of radionuclides by biota; the effects of different ecological niches on the relative uptake of radionuclides by different species; kinetic models of radionuclide uptake through trophic chains and the success and failure of different countermeasures attempted after the Chernobyl accident. ... Read more

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Risk assessment is the cornerstone of contemporary environmental protection. You must find the answers to questions such as: what might be the impacts of the new synthetic chemicals, what problems might arise from the normal operations of industry, what are the chances of accidental releases and how will they impact the environment? Understanding and assessing these risks is essential to sound environmental policy and management.The first book to address the application of the current National Research Council (NRC) risk assessment paradigm to the coastal marine environment, Coastal and Estuarine Risk Assessment covers topics that range from pollutants of emerging concern to bioavailability and bioaccumulation at the suborganismal through landscape levels. It explores the necessary applications for modifying the NRC paradigm and presents a series of steps to actually accomplish an effective assessment using the modified paradigm. The book highlights the logical framework for assessing causation, and measurement of toxicant fate and effect. The chapter authors bring together experiences from academia, private consultants, and government agencies, resulting in a rich mixture of experience and insights. Exploring the science of exposure, effect, and risk in coastal and estuarine environments, Coastal and Estuarine Risk Assessment gives you a building block approach to the fundamental components of risk assessment. ... Read more

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This digital document is an article from Atlantic Geology, published by Thomson Gale on July 1, 2006. The length of the article is 7105 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.

Citation Details
Title: Relict seawater as source of stratified groundwater in glaciated estuarine valleys: an example from Fredericton Junction, New Brunswick.
Author: Gina M. Giudice
Publication: Atlantic Geology (Magazine/Journal)
Date: July 1, 2006
Publisher: Thomson Gale
Volume: 42Issue: 2-3Page: 141(12)

Distributed by Thomson Gale ... Read more

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This digital document is an article from Fishery Bulletin, published by National Marine Fisheries Service on April 1, 2003. The length of the article is 7990 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.

Citation Details
Title: Use of ocean and estuarine habitats by young-of-year bluefish (Pomatomus saltatrix) in the New York Bight *.
Author: Kenneth W. Able
Publication: Fishery Bulletin (Refereed)
Date: April 1, 2003
Publisher: National Marine Fisheries Service
Volume: 101Issue: 2Page: 201(14)

Distributed by Thomson Gale ... Read more

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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. ... Read more

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Estuaries are the point of convergence for almost the entire array of coastal and ocean environmental issues. Management of these rapidly changing environments requires a whole-system perspective that includes integration of all available knowledge of the ecology, chemistry, and physics of estuaries. Yet estuarine research has been primarily short-term and site-specific, providing few insights that can be generalized and applied to a broader understanding of these complex ecosystems. Estuarine Science addresses that problem by presenting examples of synthetic approaches to estuarine science. Leading scientists-including Donald F. Boesch, W. Rockwell Geyer, Nancy Rabalais, Charles A. Simenstad, and many others-offer twelve chapters that report on different types of ecological synthesis and summarize the current state of scientific knowledge. Additional chapters examine the adequacy of existing synthesis, and the data and models required for improving the scientific management of estuaries in the coming decade.

Each of the book's five sections introduces a major area of estuarine syntheses; highlights key problems about that topic; reports case histories of successful synthesis; and recommends types of data to collect, processes to study, and models to build for a predictive understanding. Sections examine:

• inputs to estuaries of water, sediment, and nutrients from the drainage basin
• the coupling of estuarine physics with biogeochemistry and ecology
• the biogeochemical process in estuaries and their linkages to the food web
• controls on the distribution and abundance of organisms in the estuary
• the need for synthesis that would directly improve the scientific management of estuaries

Estuarine Science synthesizes what has been learned from the intensive research in many different estuarine projects around the country. It will be an essential work for professional scientists and graduate students working in coastal or estuarine research, as well as for managers, planners and environmentalists involved with coastal and estuarine issues. ... Read more