Download or read book The Effects of Contaminants on Sperm Quality and Intersex Condition of Smallmouth Bass Micropterus Dolomieu in the Potomac River written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ova pollution in the Potomac written by United States. Congress. House. Committee on Government Reform and published by . This book was released on 2006 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of the Pollution and Sanitary Conditions of the Potomac Watershed written by Hugh Smith Cumming and published by . This book was released on 1916 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Spatiotemporal Dynamics of Organic Contaminants in Surface Water and Their Potential Accumulation in Riverine Smallmouth Bass of the Chesapeake Bay Watershed written by Catherine Mc Clure and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contamination of freshwater resources from anthropogenic chemicals poses a serious risk to aquatic organisms worldwide. Concerns surrounding the effects of contaminants and their metabolites has led to countless studies investigating the full impact of ecologically toxic contaminants in aquatic, terrestrial and marine environments. Anthropogenically-derived contaminants include chemical compounds such as pesticides (e.g., insecticides, herbicides, etc.), both human and veterinary pharmaceuticals, personal care products (e.g., detergents, cleaning products, toothpaste, etc.), flame retardants, and plasticizers. Despite a decrease in production and use of some chemical compounds, there also are concerns over the cumulative effects from low-dose exposure of emerging contaminant mixtures in combination with other environmental stressors such as increasing water temperature, non-native species introductions and habitat degradation. Specifically in the Chesapeake Bay Watershed, there have been signs of immunosuppression (e.g., cysts, sores, lesions) and intersex (presence of oocytes in the testes) in smallmouth bass (Micropterus dolomeiu) populations (SMB). This coincided with past declines in juvenile smallmouth bass first recorded in 2005. Although population abundance is showing signs of recovery, questions remain regarding the sudden declines in abundance and detrimental fish health characteristics. Many emerging contaminants are known as endocrine disrupting compounds (EDCs) which can affect immune response, fish behavior and reproductive success in many fish species, therefore making EDCs a potential factor in the recent health declines of SMB populations. Further, juvenile SMB as young as one month old have been documented with cysts and lesions, as well as bacterial infections suggesting that young fish are more susceptible bacterial and viral infections. Research has shown that there are many contaminant exposure pathways to fish including surface water, sediment, and food sources, though less is known about the potential for the transfer of contaminants from female to young during egg development. Therefore, to investigate the role of contaminants in the decline of fish health in the region and to understand which exposure pathways contribute contaminants of concern, a multi-year study was established to investigate contaminants in surface water, sediment, and fish tissue, as well as document any clinical signs of disease (i.e., cysts, sores and lesions) in the fish sampled. The work presented in this document covers the analysis of the prevalence of contaminants in both surface water and fish tissue. The first chapter investigates the occurrence and co-occurrence dynamics of 28 contaminants and total estrogenicity in surface water across six river sampling sites over a three-year period. Bayesian hierarchical joint-contaminant models were used to describe any potential predictors in occurrence such as proportion of agricultural land-use in the immediate catchment, stream discharge or seasonality for a suite of contaminants in surface water. In addition, contaminant co-occurrence dynamics were investigated to better understand the complex dynamics of chemical mixtures present in surface water. The second chapter investigates the occurrence and concentration of contaminants in smallmouth bass adult ovary and juvenile full-body tissue to evaluate maternal transfer of contaminants as a potential exposure pathway. Additionally, different land-use types (agricultural and developed) as well as intensity of best management practices (BMPs) were investigated as potential drivers of contaminant occurrence and accumulation in fish tissue. Fish samples were collected from 11 river sites within the Chesapeake Bay Watershed during May and July of 2015. Bayesian hierarchical censored regression models and hierarchical generalized linear mixed effects models were fit to model the patterns of concentrations and occurrence, respectively, across different land-use types and BMP intensity, and to investigate any differences in contaminant concentration or occurrence between ovary and juvenile tissue. Overall results showed that occurrence in both surface water and fish tissue varied by contaminant, and that there were few significant effects of land-use on either contaminant occurrence or concentration in surface water and fish tissue. As expected, the highest contaminant occurrence probabilities in surface water occurred during the spring and summer months, a time when many pesticides are applied to the landscape and there is high surface water runoff. Additionally, stream discharge did not have a significant effect on the occurrence probabilities of most compounds in surface water. Despite a lack of significant landscape drivers, the results showed that four commonly used pesticides (atrazine, metolachlor, fipronil and simazine) co-occur across sites in surface water after accounting for environmental covariates. There were few significant landscape drivers of either contaminant occurrence or concentration in fish tissue. The landscape drivers that did exist were highly uncertain or had very weak associations, with the exception of increasing developed land-use significantly increasing the occurrence probability of di(2-ethylhexyl) phthalate (DEHP) in ovary tissue. Both contaminant occurrence probabilities and contaminant concentration varied significantly between juvenile and ovary tissue as is expected, though for one compound, pyrene, both the occurrence probability and the concentration were higher in juvenile tissue than in ovary tissue. Finally, contaminants were detected in juvenile tissue indicating that young fish are exposed to contaminants at some point during development or through environmental exposure pathways after hatching. No strong evidence was found for maternal transfer of most contaminants except for total PCBs. These results provide a necessary baseline of spatial and temporal contaminant occurrence dynamics in streams and rivers of the Chesapeake Bay Watershed. Understanding temporal and spatial contaminant dynamics as well as the potential for complex contaminant mixtures in surface waters, will provide necessary information to regional natural resource managers on contaminant exposure to fish. Additionally, this information coupled with the results that there are low levels of contaminants in juvenile SMB tissue is important for understanding contaminant exposure pathways and the recent health declines in regional populations of the Chesapeake Bay Watershed.
Download or read book Investigation of the Pollution and Sanitary Conditions of the Potomac Watershed written by Hugh Smith Cumming and published by Forgotten Books. This book was released on 2017-11-29 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Investigation of the Pollution and Sanitary Conditions of the Potomac Watershed: With Special Reference to Self Purification and the Sanitary Condition of Shellfish in the Lower Potomac River In the exercise of its constitutional powers, the Congress of the United States has, during the century and a quarter of its existence, passed numerous laws regulating the use of the navigable waters of the country as highways of interstate commerce. There is, however, so far as is known, no Federal law dealing with the pollution of interstate streams. Those who have suffered injury in person or property in consequence of such pollution must, it moms, ground their right to redress on the general principles of the common law or on statutes of the States. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Investigation of the Pollution and Sanitary Conditions of the Potomac Watershed with Special Reference to Self Purification and the Sanitary Condition written by Hugh Smith Cumming and published by Palala Press. This book was released on 2018-02-16 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Water Quality Monitoring in Response to Young of the Year Smallmouth Bass Micropterus Dolomieu Mortality in the Susquehanna River and Major Tributaries Pennsylvania written by U.S. Department of the Interior and published by CreateSpace. This book was released on 2014-03-29 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mortalities of young-of-the-year (YOY) smallmouth bass (Micropterus dolomieu) recently have occurred in the Susque-hanna River due to Flavobacterium columnare, a bacterium that typically infects stressed fish. Stress factors include but are not limited to elevated water temperature and low dis-solved oxygen during times critical for survival and devel-opment of smallmouth bass (May 1 through July 31). The infections were first discovered in the Susquehanna River and major tributaries in the summer months of 2005 but also were prevalent in 2007.
Download or read book A Reconnaissance of the Intersex Condition in Micropterus Dolomieu of the Upper Ohio River Basin as an Indicator of Anthropogenic Endocrine Disruptors written by Christopher Charles Barry and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reproductive Fitness of Smallmouth Bass Micropterus Dolomieu Under Heterogeneous Environmental Conditions written by Ryan Patrick Franckowiak and published by . This book was released on 2017 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Identifying the biotic and abiotic factors that influenceindividual reproductive fitness under natural conditions is essential for understanding important aspects of a species? evolutionary biology and ecology, population dynamics, and life-history evolution. Using next generation sequencing technology, I developed five microsatellite multiplex reactions suitable for conducting large scale parentage analysis of smallmouth bass, Micropterus dolomieu, and used molecular pedigree reconstructiontechniquesto characterize the genetic mating system and mate selection inadult smallmouth bass nesting in Lake Opeongo, Ontario, Canada. I used multivariate spatial autocorrelation analysis to indirectly infer the occurrence and extent of natal philopatry among spawning adults, to assess the strength and direction of sex-bias in natal dispersal patterns, and to evaluate the degree of nest site fidelity and breeding dispersal of spawning adults. I also evaluatedhow differences in littoral zone water temperature caused by wind-induced seiche events influence the relative reproductive success of spawning adults. Lastly, I provide a synopsis of potential future research aimed at further exploring factorsthatinfluence the reproductive fitness of smallmouth bass in Lake Opeongo. This information will contribute to our understanding of the factors regulating smallmouth bass populations, and provide insight into the factors controlling the variance in individual reproductive success and thus recruitment dynamics in this species.
Download or read book Water Quality Criteria for the Potomac River Basin written by Interstate Commission on the Potomac River Basin and published by . This book was released on 1948* with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non Infectious Disorders written by John F. Leatherland and published by C A B International. This book was released on 2010 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by leading authorities in the field, this new edition of Volume 2 in the successful Fish Diseases and Disorders trilogy has been thoroughly updated with new research and contributions. Focusing largely on finfish, it covers non-infectious disorders of development, growth and physiology of wild and captive species, including genetic conditions, respiratory disorders, stress physiology and environmental factors. There is also a new contribution on the relationship between welfare issues and disorders associated with intensive fish culture. The book is indispensable for zoologists, fish health specialists and veterinarians, researchers and students, and those involved with fisheries and aquaculture. `The book is important for those involved in aquaculture and those wishing to learn more about the effects of non-infectious disorders and the mechanisms of response within fish and is thoroughly recommended.' Journal of Fish Diseases `Brimming with interesting details, the editors have succeeded in providing an extremely informative reference book, which should be widely consulted and appreciated by its target audience.' Fish and Fisheries
Download or read book Diet for a Sustainable Ecosystem written by Benjamin E. Cuker and published by Springer. This book was released on 2020-08-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores a specific ecosystem in depth, in order to weave a story built on place and history. It incorporates the theme of a journey to help reveal the environment-human-health-food system-problem. While drawing on a historical approach stretching back to the American colonial era, it also incorporates more contemporary scientific findings. By crafting its story around a specific place, the book makes it easier for readers to relate to the content, and to subsequently use what they learn to better understand the role of food systems at the global scale.
Download or read book Biological Effects of Contaminants written by S. W. Feist and published by . This book was released on 2004 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Water Purity and Quality written by Satinder Ahuja and published by Academic Press. This book was released on 2009-07-17 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work provides those involved in water purification research and administration with a comprehensive resource of methods for analyzing water to assure its safety from contaminants, both natural and human caused. The book first provides an overview of major water-related issues in developing and developed countries, followed by a review of issues of sampling for water analysis, regulatory considerations and forensics in water quality and purity investigations. The subsequent chapters cover microbial as well chemical contaminations from inorganic compounds, radionuclides, volatile and semi-volatile compounds, disinfectants, herbicides, and pharmaceuticals, including endocrine disruptors, as well as potential terrorist-related contamination. The last chapter describes the Grainger prize-winning filter that can remove arsenic from water sources and sufficiently protect the health of a large number of people. - Covers the scope of water contamination problems on a worldwide scale - Provides a rich source of methods for analyzing water to assure its safety from natural and deliberate contaminants - Describes the filter that won the $1 million Grainger prize and thereby highlighting an important approach to remediation
Download or read book Reviews of Environmental Contamination and Toxicology Volume 238 written by Pim de Voogt and published by Springer. This book was released on 2016-05-11 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews of Environmental Contamination and Toxicology attempts to provide concise, critical reviews of timely advances, philosophy and significant areas of accomplished or needed endeavor in the total field of xenobiotics, in any segment of the environment, as well as toxicological implications.
Download or read book Ground water Flow in the New Jersey Coastal Plain written by Mary Martin and published by . This book was released on 1998 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Photo Ark written by Joel Sartore and published by National Geographic Books. This book was released on 2017 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book of photography represents National Geographic's Photo Ark, a major cross-platform initiative and lifelong project by photographer Joel Sartore to make portraits of the world's animals -- especially those that are endangered. His message: to know these animals is to save them. Sartore intends to photograph every animal in captivity in the world. He is circling the globe, visiting zoos and wildlife rescue centers to create studio portraits of 12,000 species, with an emphasis on those facing extinction. He has photographed more than 6,000 already and now, thanks to a multi-year partnership with National Geographic, he may reach his goal. This book showcases his animal portraits: from tiny to mammoth, from the Florida grasshopper sparrow to the greater one-horned rhinoceros. Paired with the prose of veteran wildlife writer Douglas Chadwick, this book presents an argument for saving all the species of our planet.
