Download or read book Occurrence of Intersex in Fishes from the Delaware and Susquehanna River Basins written by Raffaela Marano and published by . This book was released on 2017 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Endocrine disruption is an issue of emerging concern in aquatic systems. Endocrine disruption has been documented to result in decreased reproductive success, skewed sex ratios, increased vitellogenin levels, intersex, disease, and death in a variety of freshwater fish species. In this study, intersex or the presence of testicular oocytes in gonochoristic fish species was utilized as an indicator of endocrine disruption. The study design is based on both a temporal and interspecific comparison of intersex occurrence through the use of paired historical and modern fish samples. The historical samples were obtained from the ichthyology collection at the Academy of Natural Sciences of Drexel University and replicate samples were collected in July and August of 2016. Historical samples from the Delaware sites include the oldest available specimens (from as early as 1898). The Susquehanna specimens spanned a longer time gradient with multiple samples (n=4) ranging from 1969 to 2016. Male Cyprinella analostana and C. spiloptera were collected from three sites in the Delaware and one site in the Susquehanna River basins. Twenty male specimens from each sample were analyzed histologically to document the prevalence and severity of intersex. Additionally, several smallmouth bass, Micropterus dolomieu were collected and assessed as a known sensitive species. Four potentially sensitive species were identified and assessed in 2017. These four species were Lepomis auritus, Ambloplites rupestris, Etheostoma zonale, and Notropis hudsonius, and represented additional modern specimens. These species were added in an attempt to gain a better understanding of how endocrine disruption impacts the entire fish community. No specimens analyzed in this study displayed intersex other than eight M. dolomieu collected from the Susquehanna River. Land cover data was used to calculate land cover percentages for each basin. Land cover percentages indicated that the greatest altered land cover type in the Susquehanna River basin was agriculture whereas developed land was the greatest altered land cover type for the three Delaware River basin sites. This study was a first attempt at using historical specimens to understand endocrine disruption prior to the emergence of the field in the late 20th century. Additionally, there is interest in identifying a small-bodied indicator species of endocrine disruption. Although C. analostana, C. spiloptera, L. auritus, A. rupestris, E. zonale, and N. hudsonius did not portray intersex, future efforts should focus on assessing other common, small-bodied species within the Delaware and Susquehanna River basins to identify a small-bodied indicator species that can be used to assess the impact of EDCs across an entire watershed.
Download or read book Interior Environment and Related Agencies Appropriations for 2017 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Interior, Environment, and Related Agencies and published by . This book was released on 2016 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mercury Contaminated Sites written by Ralf Ebinghaus and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: An up-to-date overview of the characterization, risk assessment and remediation of mercury-contaminated sites. The book summarizes, for the first time, works from Europe, Russia and the American continent, and review chapters are supplemented by detailed, international case studies.
Download or read book A Handbook of Statistical Analyses using R Third Edition written by Torsten Hothorn and published by CRC Press. This book was released on 2014-06-25 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Like the best-selling first two editions, A Handbook of Statistical Analyses using R, Third Edition provides an up-to-date guide to data analysis using the R system for statistical computing. The book explains how to conduct a range of statistical analyses, from simple inference to recursive partitioning to cluster analysis. New to the Third Edition Three new chapters on quantile regression, missing values, and Bayesian inference Extra material in the logistic regression chapter that describes a regression model for ordered categorical response variables Additional exercises More detailed explanations of R code New section in each chapter summarizing the results of the analyses Updated version of the HSAUR package (HSAUR3), which includes some slides that can be used in introductory statistics courses Whether you’re a data analyst, scientist, or student, this handbook shows you how to easily use R to effectively evaluate your data. With numerous real-world examples, it emphasizes the practical application and interpretation of results.
Download or read book Synthesis of U S Geological Survey Science for the Chesapeake Bay Ecosystem and Implications for Environmental Management written by Scott W. Phillips and published by Geological Survey (USGS). This book was released on 2007 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this report is to present a synthesis of the USGS Chesapeake Bay science related to the 2001-06 goals and provide implications for environmental management. The report provides USGS findings that address the science needs of the Chesapeake Bay Program (CBP) restoration goals and includes summaries of 1. land-use change; 2. water quality in the watershed, including nutrients, sediment, and contaminants; 3. long-term changes in climate and estuarine water quality; 4. estuary habitats, focusing on submerged aquatic vegetation (SAV) and tidal wetlands; and 5. factors affecting fish and waterbird populations.
Download or read book History of Carrollton Manor Frederick County Md written by William Jarboe Grove and published by . This book was released on 1922 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Picturing Death 1200 1600 written by Stephen Perkinson and published by BRILL. This book was released on 2020-11-16 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Picturing Death: 1200–1600 brings together essays considering four key centuries of imagery related to human mortality, from tomb sculpture to painted altarpieces, from manuscripts to printed books, and from minute carved objects to large-scale architecture.
Download or read book National Coastal Condition Report written by Kevin Summers and published by . This book was released on 2001 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fish Diseases and Disorders Non infectious disorders written by John F. Leatherland and published by Oxford University Press, USA. This book was released on 1998 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book follows on from the first volume, on protozoan and metazoan infections, of a three-volume series. It focuses largely on finfish and considers non-infectious disorder of development, growth and physiology of wild and captive species. Various sections address topics such as tumourigenesis, stress physiology and the effects of stressors on particular processes, and the effect of environmental factors (including toxic substances) on fish health. The economic implications of non-infectious disorders in intensive aquaculture are of particular importance, and a chapter is devoted specifically to this. The final chapter describes evaluation methods for the assessment of disorders at the individual, population and community level. The book is indispensable for zoologists, veterinary scientists and those concerned with fisheries and aquaculture.
Download or read book The Ripple Effect written by Alex Prud'homme and published by Simon and Schuster. This book was released on 2012-04-10 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Alex Prud'homme's remarkable work of investigative journalism shows how fresh water is the pressing global issue of the twenty-first century"--
Download or read book Words to Rhyme with written by Willard R. Espy and published by Checkmark Books. This book was released on 2001 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: An easy-to-use dictionary of over 80,000 rhyming words.
Download or read book An Ocean Blueprint for the 21st Century written by United States. Commission on Ocean Policy and published by . This book was released on 2004 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying DVD contains 2 segments: the first shows the developmental process into making the report, the second shows a summary of the findings and recommendations of the report.
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 The Chesapeake Bay in Maryland written by Alice Jane Lippson and published by . This book was released on 1973 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Black Bass Diversity written by Michael D. Tringali and published by . This book was released on 2015 with total page 685 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Livestock and Poultry Inventory written by United States. Crop Reporting Board and published by . This book was released on 1971 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
