Download or read book Mercury Bioaccumulation in Fishes from Subalpine Lakes in the Wallowa whitman National Forest Northeastern Oregon and Western Idaho written by U.S. Department of the Interior and published by CreateSpace. This book was released on 2014-03 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury (Hg) is a globally distributed pollutant that poses considerable risks to human and wildlife health. Over the past 150 years since the advent of the industrial revolution, approximately 80 percent of global emissions have come from anthropogenic sources, largely fossil fuel combustion. As a result, atmospheric deposition of Hg has increased by up to 4-fold above pre-industrial times. Because of their isolation, remote high-elevation lakes represent unique environments for evaluating the bioaccumulation of atmospherically deposited Hg through freshwater food webs, as well as for evaluating the relative importance of Hg loading versus landscape influences on Hg bioaccumulation.
Download or read book Mercury Bioaccumulation in Fishes from Subalpine Lakes of the Wallowa Whitman National Forest Northeastern Oregon and Western Idaho written by Collin A. Eagles-Smith and published by . This book was released on 2013 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mercury Bioaccumulation in Remote Subalpine Lakes written by Adam Pfleeger and published by . This book was released on 2015 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury (Hg) contamination is a global conservation threat to freshwater ecosystems, detected in even the protected lakes of Olympic National Park (Washington, USA). Although considered some of the most remote and pristine US ecosystems, these lakes are currently subject to multiple environmental stressors, including climate change and fish introductions; adding contaminants, such as Hg, could exacerbate the effects of these stressors on native species. Amphibians are undergoing large worldwide declines, which include declines in protected areas, such as our National Parks. Our goal is to better understand the effect of historically stocked fish in Olympic National Park on native amphibian Hg bioaccumulation. To minimize the need for lethal sampling of this already threatened group, we first examine how Hg concentrations in non-lethally sampled amphibian tissues correlated with whole-body Hg concentrations, depending on species and the different type of non-lethal tissue sample used. Second, we aimed to understand how a food web altered by fish impacted Hg bioaccumulation in native species. We measured Hg and stable isotopes of carbon and nitrogen in organisms across trophic levels from 18 subalpine lakes. We detected small shifts in salamander food web indices and minor changes to salamander Hg concentration associated with the presence of fish. Importantly, we found increased mercury trophic magnification slopes in lakes with fish compared to fishless lakes. This research provides evidence that historic fish introductions can elevate mercury exposure in pristine ecosystems compared to natural fishless lakes.
Download or read book Mercury in Fish Bed Sediment and Water from Streams Across the United States 1998 2005 written by and published by . This book was released on 2009 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mercury in Fish Bed Sediment and Water from Streams Across the United States 1998 2005 written by Barbara C. Scudder and published by DIANE Publishing. This book was released on 2010-08 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report on how mercury (Hg) was examined in top-predator fish, bed sediment, and water from streams that spanned regional and national gradients of Hg source strength and other factors thought to influence methylmercury bioaccum. Sampled settings include stream basins that were agr¿l, urbanized, undeveloped, and mined. Predator fish were targeted for collection, and composited samples of fish were analyzed for total Hg (THg), as most of the Hg found in fish tissue is MeHg. Samples of bed sediment and stream water were analyzed for THg, MeHg, and characteristics thought to affect Hg methylation, such as loss-on-ignition and acid-volatile sulfide in bed sediment, and pH, dissolved organic carbon, and dissolved sulfate in water. Illus.
Download or read book Mercury in Fish written by Collin Aaron Eagles-Smith and published by . This book was released on 2006 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mercury Bioaccumulation in Fish in a Region Affected by Historic Gold Mining written by and published by . This book was released on 2000 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mercury Bioaccumulation and Biomagnification in the Warmwater Fish Communities of Two Connecticut Lakes with an Examination of Seasonal Variations in Mercury Concentrations written by Scott M. Ward and published by . This book was released on 1997 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Fish Community Complexity on Mercury Bioaccumulation in Lake Food Webs Supporting Brook Trout Salvelinus Fontinalis written by Monica Lynn Darlene Finley and published by . This book was released on 2013 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mercury Concentrations in Yellow Perch Perca Flavescens from 24 Lakes at Kejimkujik National Park Nova Scotia written by Jennifer A. Carter and published by [Halifax, N.S.] : Parks Canada. This book was released on 2001 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of a wider study on the bioaccumulation & ecological effects of mercury in freshwater fish & wildlife in Canada, this study measured total mercury in yellow perch from 24 lakes in Nova Scotia. The objectives of the study were to assess mercury concentrations in prey of common loons, which themselves have high mercury levels, and to determine which environmental factors were associated with differences in fish mercury concentrations from lake to lake. Results presented include mean perch mercury concentration & concentration range, correlations of fish characteristics with whole-fish mercury concentrations, and correlations of water chemistry parameters with fish mercury concentrations.
Download or read book The Fate of Atmospherically Deposited Mercury in Mountain Lake Food Webs and Implications for Fisheries Management written by and published by . This book was released on 2019 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mountain lakes are an iconic feature of the landscape in the Mountain West. They hold significant ecological and cultural value, and are important sentinels of environmental change. Despite their pristine image, these remote waterbodies are subjected to numerous anthropogenic stressors. Mountain lakes are naturally fishless systems, but historical fish stocking has led to major changes in mountain lake food web structure, including declines of resident amphibians, large-bodied zooplankton, and emergent insect populations. Atmospherically deposited contaminants, such as mercury, can accumulate in mountain lake food webs, leading to relatively high levels in the fish relative to the water. Managing for these stressors is difficult, because although fish stocking causes ecological problems, and mercury bioaccumulation poses human health risks, the cultural value of angling remains important. The goal of this dissertation was to better understand the issues of fish stocking and mercury bioaccumulation in a socioecological context: from the importance of trophic dynamics for mercury bioaccumulation in mountain lake fish, to the implications of fish stocking and mercury bioaccumulation for mountain lake management. In Chapter 2, I identified the ecological, limnological, and landscape-level indicators of mercury bioaccumulation in mountain lake food webs in order to inform better ecosystem management. In Chapter 3, I conducted an experiment to test if fatty acid stable isotopes can partition benthic and terrestrial prey sources in fish in a simplified mountain lake food web, in hopes of providing a more informative tool for future food web studies. In Chapter 4, I used intercept surveys to determine the public perceptions of mountain lake fisheries management in two national parks, and assess the risk mercury may pose to mountain lake anglers by determining fish consumption habits. This dissertation provides a unique set of tools that advance our understanding of food web dynamics and mercury bioaccumulation in mountain lakes, as well as the social value of these ecosystems. My results suggest that the most effective way to protect the health of mountain lakes and their visitors will be for managing agencies to collaborate with scientists and angling groups when making fisheries management decisions, and to invest in outreach about both the ecological and toxicological implications of fish stocking and mercury bioaccumulation in mountain lakes. The use of such socioecological research approaches is becoming progressively more important, as the threats of climate change and unstable regulatory protections for mountain ecosystems increase.
Download or read book Mercury Dynamics in Streams Lakes and Fish in the Northeastern United States written by Jason A. Dittman and published by . This book was released on 2010 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bioaccumulation of Mercury and Organochlorines in the Food Web of Lake Washington written by Jenifer K. McIntyre and published by . This book was released on 2004 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variations in Mercury Bioaccumulation in Fish Along the River Continuum of Four Arizona Freshwater Ecosystems written by Edyth Hermosillo and published by . This book was released on 2010 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trends in the Mercury Content of Western Lake Erie Fish and Sediment 1970 1977 written by J. D. Kinkead and published by . This book was released on 1978 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fish Mercury Levels in Northeastern Massachusetts Lakes written by Massachusetts. Department of Environmental Protection. Office of Research and Standards and published by . This book was released on 2003 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Patterns of Mercury in Aquatic Biota in Twin Lakes Washington written by Piper Elizabeth Marshall and published by . This book was released on 2011 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
