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The Effect Of Protozoan Grazers On The Cycling Of Polychlorinated Biphenyls Pcbs In Marine Systems
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Book Synopsis The Effect of Protozoan Grazers on the Cycling of Polychlorinated Biphenyls (PCBs) in Marine Systems by :
Download or read book The Effect of Protozoan Grazers on the Cycling of Polychlorinated Biphenyls (PCBs) in Marine Systems written by and published by . This book was released on 2000 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Protozoan Grazers on the Cycling of Polychlorinated Biphenyls (PCBs) in Marine Systems by : Elizabeth B. Kujawinski
Download or read book The Effect of Protozoan Grazers on the Cycling of Polychlorinated Biphenyls (PCBs) in Marine Systems written by Elizabeth B. Kujawinski and published by . This book was released on 2000 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) surface-active material in ciliate cultures was significantly higher than in flagellate cultures, and all protozoan cultures were higher than the bacterial control. Common headspace vessels were then used to compare and contrast the affinity of protozoan and bacterial culture filtrates (
Book Synopsis The Effects of Protozoan Grazers on the Cycling of Polychlorinated Biphenyls (PCBs) in Marine Systems by :
Download or read book The Effects of Protozoan Grazers on the Cycling of Polychlorinated Biphenyls (PCBs) in Marine Systems written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this thesis was to understand how microbially-mediated recycling processes affect chiorobiphenyl (CB) cycling in marine systems by monitoring CB dynamics among organic carbon pools represented by dissolved organic matter, bacterial prey and phagotrophic protozoan grazers. When grazing and non-grazing protozoa were equilibrated with aqueous polychlorinated biphenyls (PCBs); no difference in equilibration time was observed, indicating that diffusion was the primary uptake pathway. The transition size of an organism where rates of diffusive and ingested uptake are equivalent was determined. Enhanced CB diffusive fluxes across the diffusive boundary layer were observed due to CB-DOC complex disassociation within this layer. Temporal dynamics of DOC, surfactants, lipo-polysaccharides and cells were monitored in protozoan cultures as a function of protozoan species and prey growth substrate. Production of surface-active material in ciliate cultures was significantly higher than in flagellate cultures, and all protozoan cultures were higher than the bacterial control. Affinities of protozoan and bacterial culture filtrates (
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of Protozoan Grazing on the Marine Geochemistry of Particle Reactive Trace Metals by : Katherine Barbeau
Download or read book Influence of Protozoan Grazing on the Marine Geochemistry of Particle Reactive Trace Metals written by Katherine Barbeau and published by . This book was released on 1998 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis examines the effect of intracellular digestion by phagotrophic organisms (protozoan grazers) on the solid/liquid partitioning and speciation of strongly hydrolyzed, particle-reactive trace metals, including Fe and Th. A series of experiments was carried Out in model systems in order to determine the effect of grazer-mediated transformations on trace metals associated with cellular phases. Principle findings included mobilization of extracellular as well as intracellular trace metals by protists, apparent generation of metal-organic complexes, and decoupling of metal and carbon cycling. Studies of the effect of grazers on colloidal iron oxide (ferrihydrite) indicated that protozoan grazing can increase the dissolution rate of iron oxide phases through phagotrophic ingestion. As part of this work a novel tracer technique was 133 developed, based on the synthesis of colloidal ferrihydrite impregnated with Ba-133 as an inert tracer. This technique was shown to be a sensitive indicator for the extent of ferrihydrite dissolution/alteration by a variety of mechanisms. Using this technique, grazing by natural protistan assemblages was shown to enhance the dissolution rate of colloidal ferrihydrite over that in non-grazing controls. when integrated temporally over the euphotic zone, protozoan grazing may equal or exceed photoreduction as a pathway for iron oxide dissolution. ." -- Stinet.
Book Synopsis The Marine Biogeochemistry of Molybdenum by : Caroline Beth Tuit
Download or read book The Marine Biogeochemistry of Molybdenum written by Caroline Beth Tuit and published by . This book was released on 2003 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Mn oxides were not found to significantly influence either the dissolved or SPM Mo distribution. Dissolved Mo profiles from the Sargasso and Arabian Sea were conservative. However, dissolved Mo profiles from the Eastern Tropical Pacific showed both depletion and enrichment of dissolved Mo possibly associated with interaction of Mo with coastal sediments. Dissolved Mo profiles in several California Borderland Basins showed 1-2 nM Mo depletions below sill depth. A more focused study of water column response to sediment fluxes using the high precision Mo analyses is necessary to determine whether these phenomena are related.
Book Synopsis Applied and Environmental Microbiology by :
Download or read book Applied and Environmental Microbiology written by and published by . This book was released on 2000 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Francisco Sánchez-Bayo, Paul J. van den Brink, Reinier M. Mann Publisher :Francisco Sanchez-Bayo ISBN 13 :1608051218 Total Pages :288 pages Book Rating :4.6/5 (8 download)
Book Synopsis Ecological Impacts of Toxic Chemicals by : Francisco Sánchez-Bayo, Paul J. van den Brink, Reinier M. Mann
Download or read book Ecological Impacts of Toxic Chemicals written by Francisco Sánchez-Bayo, Paul J. van den Brink, Reinier M. Mann and published by Francisco Sanchez-Bayo. This book was released on 2011-09-09 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecological Impacts of Toxic Chemicals presents a comprehensive, yet readable account of the known disturbances caused by all kinds of toxic chemicals on both aquatic and terrestrial ecosystems. Topics cover the sources of toxicants, their fate and distribution through the planet, their impacts on specific ecosystems, and their remediation by natural systems. Each chapter is written by well-known specialists in those areas, for the general public, students, and even scientists from outside this field. The book intends to raise awareness of the dangers of chemical pollution in a world dominated by industry and globalization of resources. Because the problems are widespread and far reaching, it is hoped that confronting the facts may prompt better management practices at industrial, agricultural and all levels of management, from local to governmental, so as to reduce the negative impacts of chemical contaminants on our planet.
Book Synopsis Managing Ocean Environments in a Changing Climate by : Kevin J. Noone
Download or read book Managing Ocean Environments in a Changing Climate written by Kevin J. Noone and published by Newnes. This book was released on 2013-06-29 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Managing Ocean Environments in a Changing Climate summarizes the current state of several threats to the global oceans. What distinguishes this book most from previous works is that this book begins with a holistic, global-scale focus for the first several chapters and then provides an example of how this approach can be applied on a regional scale, for the Pacific region. Previous works usually have compiled local studies, which are essentially impossible to properly integrate to the global scale. The editors have engaged leading scientists in a number of areas, such as fisheries and marine ecosystems, ocean chemistry, marine biogeochemical cycling, oceans and climate change, and economics, to examine the threats to the oceans both individually and collectively, provide gross estimates of the economic and societal impacts of these threats, and deliver high-level recommendations. Nominated for a Katerva Award in 2012 in the Economy category State of the science reviews by known marine experts provide a concise, readable presentation written at a level for managers and students Links environmental and economic aspects of ocean threats and provides an economic analysis of action versus inaction Provides recommendations for stakeholders to help stimulate the development of policies that would help move toward sustainable use of marine resources and services
Book Synopsis The Seine River Basin by : Nicolas Flipo
Download or read book The Seine River Basin written by Nicolas Flipo and published by Springer Nature. This book was released on 2021-01-30 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book reviews the water-agro-food and socio-eco-system of the Seine River basin (76,000 km2), and offers a historical perspective on the river’s long-term contamination. The Seine basin is inhabited by circa 17 million people and is impacted by intensive agricultural practices and industrial activities. These pressures have gradually affected its hydrological, chemical and ecological functioning, leading to a maximum chemical degradation between the 1960s and the 1990s. Over the last three decades, while major water-quality improvements have been observed, new issues (e.g. endocrine disruptors, microplastics) have also emerged. The state of the Seine River network, from the headwaters to estuary, is increasingly controlled by the balance between pressures and social responses. This socio-ecosystem provides a unique example of the functioning of a territory under heavy anthropogenic pressure during the Anthropocene era. The achievements made were possible due to the long-term PIREN Seine research program, established in 1989 and today part of the French socio-ecological research network “Zones Ateliers”, itself part of the international Long-term Socio-economic and Ecological Research Network (LTSER). Written by experts in the field, the book provides an introduction to the water budget and the territorial metabolism of the Seine basin, and studies the trajectories and impact of various pollutants in the Seine River. It offers insights into the ecological functioning, the integration of agricultural practices, the analysis of aquatic organic matter, and the evolution of fish assemblages in the Seine basin, and also presents research perspectives and approaches to improve the water quality of the Seine River. Given its scope, it will appeal to environmental managers, scientists and policymakers interested in the long-term contamination of the Seine River.
Book Synopsis Chemical Biomarkers in Aquatic Ecosystems by : Thomas S. Bianchi
Download or read book Chemical Biomarkers in Aquatic Ecosystems written by Thomas S. Bianchi and published by Princeton University Press. This book was released on 2011-02-28 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook provides a unique and thorough look at the application of chemical biomarkers to aquatic ecosystems. Defining a chemical biomarker as a compound that can be linked to particular sources of organic matter identified in the sediment record, the book indicates that the application of these biomarkers for an understanding of aquatic ecosystems consists of a biogeochemical approach that has been quite successful but underused. This book offers a wide-ranging guide to the broad diversity of these chemical biomarkers, is the first to be structured around the compounds themselves, and examines them in a connected and comprehensive way. This timely book is appropriate for advanced undergraduate and graduate students seeking training in this area; researchers in biochemistry, organic geochemistry, and biogeochemistry; researchers working on aspects of organic cycling in aquatic ecosystems; and paleoceanographers, petroleum geologists, and ecologists. Provides a guide to the broad diversity of chemical biomarkers in aquatic environments The first textbook to be structured around the compounds themselves Describes the structure, biochemical synthesis, analysis, and reactivity of each class of biomarkers Offers a selection of relevant applications to aquatic systems, including lakes, rivers, estuaries, oceans, and paleoenvironments Demonstrates the utility of using organic molecules as tracers of processes occurring in aquatic ecosystems, both modern and ancient
Book Synopsis Water Quality Assessments by : Deborah V Chapman
Download or read book Water Quality Assessments written by Deborah V Chapman and published by CRC Press. This book was released on 1996-08-22 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guidebook, now thoroughly updated and revised in its second edition, gives comprehensive advice on the designing and setting up of monitoring programmes for the purpose of providing valid data for water quality assessments in all types of freshwater bodies. It is clearly and concisely written in order to provide the essential information for all agencies and individuals responsible for the water quality.
Book Synopsis Biogeochemistry of Amino Acids by : Peter Edgar Hare
Download or read book Biogeochemistry of Amino Acids written by Peter Edgar Hare and published by John Wiley & Sons. This book was released on 1980-05-13 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents papers read at a conference held at Airlie House, Warenton, Virginia, October 29 to November 1, 1978 on ``Advances in the Biogeochemistry of Amino Acids.'' Offers the concepts, techniques, and results of most of the active participants in this area of research. The papers are representative of the major areas in which amino acid biogeochemistry is being developed, but they also point to new areas of future research. Provides numerous instances of amino acid biogeochemistry as an interdisciplinary science by including the thoughts of scientists from backgrounds as diverse as geology, archeology, paleontology, and geochemistry.
Book Synopsis Marine Algal Bloom: Characteristics, Causes and Climate Change Impacts by : Santosh Kumar Sarkar
Download or read book Marine Algal Bloom: Characteristics, Causes and Climate Change Impacts written by Santosh Kumar Sarkar and published by Springer. This book was released on 2018-05-02 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the marine environment, single-celled, microscopic, plant-like organisms naturally occur in the well-lit surface layer of any body of water. These organisms, referred to as phytoplankton or microalgae, form the base of the food web upon which nearly all other marine organisms depend. Algal bloom is a rapid increase in or accumulation of the population of about 300 species of algae due to excess nutrients (eutrophication), and is of major global interest as it causes reduction in species diversity, abrupt changes in water quality, and discoloration of the water (green, yellow, brown or red) depending on the species of algae and the type of pigments they contain. Dying blooms can also be an environmental concern as when the cells sink and decay, bacteria break down the organic material, which in turn strips oxygen from the water. This microbial oxygen demand at times leads to very low oxygen levels in the bottom waters, harming aquatic life. Documentation of this sporadic high abundance of algae, together with the significant species richness of the diatoms, requires comprehensive studies in the Sundarban coastal environment, which is facing severe degradation due to natural & anthropogenic stressors. In addition, a better understanding of the effects of algal blooms on seafood quality, the complex biological, chemical and physical interactions and subsequent effects on trophodynamics is needed to develop strategies for effective coastal zone management. The book discusses the occurrence of harmful algal blooms (HABs) caused by the dinoflagellates of the genus Alexandrium and Karenia, or diatoms of the genus Pseudo-nitzschia, which have large and varied impacts on marine ecosystems (such as large-scale marine mortality events that have been associated with various types of shellfish poisonings) depending on the species involved, the environment where they are found, and the mechanism by which they exert negative effects. HABs represent a major environmental problem in all regions of the U.S., and their occurrence is on the rise due to increased nutrient pollution. HABs have severe impacts on human health, aquatic ecosystems, and the economy. Such blooms, known colloquially as red tides due to their red or brown hues, are increasing in frequency and magnitude worldwide as a result of changes in oceanic climate, increased coastal eutrophication and enhanced long-distance dispersal in ballast water. As such, the book offers an in-depth account of the complex biological, chemical and physical interactions of the algal blooms (both innocuous and harmful ones). It also discusses the highly topical issue of the impact of global climate change on the frequency and severity of HABs in the context of alterations in temperature, stratification, light and ocean acidification. Focusing on both basic and applied limnology, this book is a reliable and up-to-date reference resource for students, teachers and researchers engaged in the field of coastal research/management at regional and global scales.
Download or read book EPA 540/9 written by and published by . This book was released on 1975-02 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Long-term Environmental Change in Arctic and Antarctic Lakes by : Reinhard Pienitz
Download or read book Long-term Environmental Change in Arctic and Antarctic Lakes written by Reinhard Pienitz and published by Springer Science & Business Media. This book was released on 2005-05-03 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concerns about the effects of global climate change have focused attention on the vulnerability of circumpolar regions. This book offers a synthesis of the spectrum of techniques available for generating long-term environmental records from circumpolar lakes.
Book Synopsis Mechanisms of Migration in Fishes by : James D. McCleave
Download or read book Mechanisms of Migration in Fishes written by James D. McCleave and published by Springer Science & Business Media. This book was released on 2013-03-13 with total page 567 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last major synthesis of our knowledge of fish migration and the underlying transport and guidance phenomena, both physical and biological, was "Fish Migration" published 16 years ago by F.R. Harden Jones (1968). That synthesis was based largely upon what could be gleaned by classical fishery-biology techni.ques, such as tagging and recapture studies, commercial fishing statistics, and netting and trapping studies. Despite the fact that Harden Jones also provided, with a good deal of thought and speculation, a theoretical basis for studying the various aspects of fish migration and migratory orientation, progress in this field has been, with a few excepti.ons, piecemeal and more disjointed than might have been expected. Thus we welcomed the approach from the NATO Marine Sciences Programme Panel and the encouragement from F.R. Harden Jones to develop a proprosal for, and ultimately to organize, a NATO Advanced Research Institute (ARI) on mechanisms of fish migration. Substantial progress had been made with descriptive, analytical and predictive approaches to fish migration since the appearance of "Fish ~ligration." Both because of the progress and the often conflicting results of research, we felt that the time was again right and the effort justified to synthesize and to critically assess our knowledge. Our ultimate aim was to identify the gains and shortcomings and to develop testable hypotheses for the next decade or two.
