Download or read book The Effects of PCB contaminated Environments on the Leopard Frog Rana Pipiens written by Susan M. Kersten and published by . This book was released on 1997 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Exposure of Northern Leopard Frog Rana Pipiens to a Pollution Gradient in the Green Bay and Fox River Ecosystem Wisconsin USA written by Tara Lynn Edblom and published by . This book was released on 2001 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Immunotoxic Effects of Persistent Organic Pollutants on the Northern Leopard Frog Lithobates Rana Pipiens written by and published by . This book was released on 2013 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lithobates (Rana) pipiens is a native amphibian species of north central North America and has experienced population declines, making it of interest to investigate whether organic contaminant exposure compromises immune function in this frog species. L. pipiens is exposed to a variety of contaminants in the wild, including the two that are the focus of this dissertation, polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs). Tadpoles, orally exposed to environmentally relevant levels of PBDEs, were assessed for innate and adaptive immune responses following metamorphosis. PBDE exposure significantly decreased secondary antibody response to the antigen, keyhole limpet hemocyanin (KLH). Innate immune measures were not significantly altered by PBDE exposure. When tadpoles were exposed to environmentally relevant, dietary levels of PCB-126, there were no effects of PCB-126 on survival, growth and development of tadpoles, but there were alterations in immune responses. PCB-exposed frogs, challenged with KLH, had significantly decreased levels of KLH-specific IgY antibodies compared to the control frogs. The amount of secreted antimicrobial skin peptides (AMPs) was also significantly decreased in PCB-treated animals, but the composition of AMPs was not affected by PCB exposure. We ran two additional exposure trials to test whether life stage affected immune response following PCB-126 exposure. When tadpoles were exposed to PCB-126 and also challenged with a primary injection of KLH, the level of KLH-specific IgY antibodies produced following metamorphosis was significantly suppressed compared to control frogs. However, suppression was not apparent when animals were exposed to PCB-126 only after metamorphosis. To assess innate immune response, we measured complement hemolytic activity in the juvenile frogs. Larval PCB-126 exposure decreased hemolytic activity of frogs compared to unexposed frogs, but this suppression was no longer apparent when frogs were exposed only after metamorphosis. This is the first study to demonstrate differences in immunotoxicity between anuran life stages, and that a carry-over effect of larval immune disruption due to PCB-126 exposure persisted through metamorphosis and suppressed post-metamorphic frog immunity. The collection of research in this dissertation provides evidence in juvenile L. pipiens for immunomodulation following exposure to both PBDEs and PCB-126.
Download or read book Amphibian Declines written by Michael Lannoo and published by Univ of California Press. This book was released on 2005-06-15 with total page 1117 pages. Available in PDF, EPUB and Kindle. Book excerpt: This benchmark volume documents in comprehensive detail a major environmental crisis: rapidly declining amphibian populations and the disturbing developmental problems that are increasingly prevalent within many amphibian species. Horror stories on this topic have been featured in the scientific and popular press over the past fifteen years, invariably asking what amphibian declines are telling us about the state of the environment. Are declines harbingers of devastated ecosystems or simply weird reflections of a peculiar amphibian world? This compendium—presenting new data, reviews of current literature, and comprehensive species accounts—reinforces what scientists have begun to suspect, that amphibians are a lens through which the state of the environment can be viewed more clearly. And, that the view is alarming and presages serious concerns for all life, including that of our own species. The first part of this work consists of more than fifty essays covering topics from the causes of declines to conservation, surveys and monitoring, and education. The second part consists of species accounts describing the life history and natural history of every known amphibian species in the United States.
Download or read book Environmental Health Perspectives written by and published by . This book was released on 2004 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Parasite Communities of Leopard Frogs rana Pipiens from Wetland Habitants Impacted by Agriculture written by Kayla Christina King and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Environmental Contaminants in Biota written by W. Nelson Beyer and published by CRC Press. This book was released on 2011-02-23 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discussing the interpretation of tissue concentrations of contaminants in wildlife, this updated edition of a bestseller draws on current scientific research and includes new chapters and greater emphasis on aquatic organisms. Each chapter provides a summary and review of a specific chemical along with direction on research methods and the interpretation of conflicting or insufficient data. Chapters include a comprehensive history of contaminant interpretation in wildlife and fish, the use of tissue residues in ecological risk assessment, and detailed coverage of all bioaccumulative contaminants and their physiologic affects.
Download or read book Ecotoxicology of Amphibians and Reptiles written by Donald W. Sparling and published by CRC Press. This book was released on 2010-06-02 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on the success of its popular predecessor, the second edition of Ecotoxicology of Amphibians and Reptiles presents newly available findings on the species that are important environmental indicators. This new edition covers nearly twice as many topics as the first, including recent developments in the ecotoxicology of amphibians and reptil
Download or read book Environment Abstracts Annual written by and published by . This book was released on 1990 with total page 2142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This database encompasses all aspects of the impact of people and technology on the environment and the effectiveness of remedial policies and technologies, featuring more than 950 journals published in the U.S. and abroad. The database also covers conference papers and proceedings, special reports from international agencies, non-governmental organizations, universities, associations and private corporations. Other materials selectively indexed include significant monographs, government studies and newsletters.
Download or read book OECD Guidelines for the Testing of Chemicals Section 2 Test No 231 Amphibian Metamorphosis Assay written by OECD and published by OECD Publishing. This book was released on 2009-09-08 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Test Guideline describes an amphibian metamorphosis assay intended to screen substances which may interfere with the normal functioning of the hypothalamo-pituitary-thyroid axis. The assay was validated with the species Xenopus laevis, which is ...
Download or read book Index Medicus written by and published by . This book was released on 2003 with total page 2004 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1963- include as pt. 2 of the Jan. issue: Medical subject headings.
Download or read book Environmental Toxicology and Chemistry written by and published by . This book was released on 2006 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Program and Abstracts written by and published by . This book was released on with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Amphibian Declines written by Michael J. Lannoo and published by Univ of California Press. This book was released on 2005-06-15 with total page 1124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Documents in comprehensive detail a major environmental crisis: rapidly declining amphibian populations and the disturbing developmental problems that are increasingly prevalent within many amphibian species.
Download or read book The Journal of the Iowa Academy of Science written by and published by . This book was released on 2000 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Great Lakes Science written by and published by . This book was released on 2001 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
