Download or read book Effects of Methylmercury on the General Health of Wild Fish in Kejimkujik National Park Nova Scotia written by Stephanie Graves and published by . This book was released on 2016 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Kejimkujik National Park and National Historic Site (KNPNHS), Nova Scotia is considered a biological mercury (Hg) hotspot because the yellow perch (Perca flavescens) and common loons (Gavia immer) inhabiting the lakes frequently exceed 'safe' levels of Hg. In this study, the relationship between Hg and overall health of three forage fish species (brown bullhead Ameirus nebulosus, banded killifish Fundulus diaphanus and golden shiner Notemigonus crysoleucas) in the lakes of KNPNHS was assessed using the endpoints condition factor, liversomatic index (LSI) and macrophage aggregates (MAs; indicators of tissue damage). Condition was negatively related to Hg in golden shiner and banded killifish, LSI was not related to Hg in any of the three species, and all species showed evidence of increasing MA prevalence with increasing Hg concentrations. These findings suggest that the health of wild fish species in KNPNHS is being affected by Hg, and that Hg concentrations similar to or greater than those found in the fish from KNPNHS are of concern for the health of other populations of wild fishes."--Leaf ii.
Download or read book Mercury Concentrations in Brook Trout and White Perch from Kejimkujik National Park Nova Scotia written by André D'Entremont and published by Halifax, N.S. : Parks Canada, Atlantic Region. This book was released on 1998 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examines fillet mercury levels in brook trout (Salvelinus fontinalis) and white perch (Morone americana) collected from water bodies in Kejimkujik National Park. Mercury levels found in these species, important components of the local recreational fishery, are compared to those observed in other North American studies and to Health Canada guidelines regarding safe consumption of fish. Correlations are identified between total mercury concentrations and fish age, length, and weight. Differences in mean mercury concentrations among sampling locations are also noted, and possible sources of the mercury contamination are discussed.
Download or read book Effects of Mercury on the General and Reproductive Health of Yellow Perch in Kejimkujik National Park Nova Scotia written by Katharina Batchelar and published by . This book was released on 2012 with total page 286 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 Toxicological Effects of Methylmercury written by National Research Council and published by National Academies Press. This book was released on 2000-09-27 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury is widespread in our environment. Methylmercury, one organic form of mercury, can accumulate up the aquatic food chain and lead to high concentrations in predatory fish. When consumed by humans, contaminated fish represent a public health risk. Combustion processes, especially coal-fired power plants, are major sources of mercury contamination in the environment. The U.S. Environmental Protection Agency (EPA) is considering regulating mercury emissions from those plants. Toxicological Effects of Methylmercury reviews the health effects of methylmercury and discusses the estimation of mercury exposure from measured biomarkers, how differences between individuals affect mercury toxicity, and appropriate statistical methods for analysis of the data and thoroughly compares the epidemiological studies available on methylmercury. Included are discussions of current mercury levels on public health and a delineation of the scientific aspects and policy decisions involved in the regulation of mercury. This report is a valuable resource for individuals interested in the public health effects and regulation of mercury. The report also provides an excellent example of the implications of decisions in the risk assessment process for a larger audience.
Download or read book Methylmercury in Fish written by National Health and Medical Research Council (Australia) and published by . This book was released on 1973 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Toxicology and Chemistry written by and published by . This book was released on 2005 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methylmercury in Fish written by National Health and Medical Research Council (Australia) and published by . This book was released on 1973 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methylmercury written by Andrew P. Clampet and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methylmercury (MeHg) is considered a major environmental pollutant that bioaccumulates in fish tissues in direct relation to their age and predatory status. Growing evidence indicates that MeHg toxicity induces a selenium deficiency disease since most of the hallmarks of severe selenium deficiency are also present in mercury toxicity cases. The main source of MeHg exposure in humans is through seafood ingestion. This book presents current research from across the globe in the study of methymercury, including the role of selenium in mitigating mercury toxicity; fish as a dietary source of mercury and methylmercury; as well as in vitro MeHg toxicity studies.
Download or read book Health Effects of Methylmercury written by Jerzy K. Piotrowski and published by . This book was released on 1981 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Among lake Variability in Methylmercury and Amino Acids in Aquatic Invertebrates from Kejimkujik National Park written by Jennifer C. Thera and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methylmercury (MeHg) is a neurotoxicant that is known to biomagnify in food webs and can result in fish consumption advisories. In aquatic invertebrates, MeHg concentrations are known to be highly variable (up to 30-fold) within and among freshwater systems and are a key predictor of mercury in fish, as diet is the main route of exposure. As such, there is global interest in understanding why some systems and invertebrate species accumulate more MeHg than others. The factors driving MeHg variability in aquatic invertebrates are not fully understood, but appear to correlate in part with diet and the physical and chemical parameters of the system. Since MeHg is primarily bound to the amino acid cysteine in proteins, my hypotheses were that cysteine content will be species-specific and that it will explain the within and among taxa variability in MeHg. In 2013 and 2014, food web taxa (benthic invertebrates, zooplankton, and fish) were collected from six lakes within Kejimkujik National Park, Nova Scotia, Canada that are known to vary in physical and chemical characteristics and biotic MeHg. Accurate detection and quantification of amino acids (especially thiols) are needed before they can be applied to the understanding of MeHg variability. I developed and validated a UPLC method to analyze amino acids in aquatic invertebrates, biofilm, and fish muscle. Overall, performance characteristics were reproducible, accurate, and comparable to other methods and tissues. The amino acid compositions of aquatic invertebrates, an understudied group, were significantly different based largely on their percentages of cysteine, histidine, proline, and aspartic acid + asparagine. Cysteine content differed among invertebrate taxa, with the lowest concentrations in Limnephilidae caddisflies (4.67 ± 0.58 nmol mg−1 tissue) and the highest concentrations in zooplankton (7.82 ± 2.88 nmol mg−1 tissue), but not among lakes (pH range 5.5-6.2). Primary consumers feeding on a benthic carbon source (Limnephilidae and Heptageniidae) had less cysteine and less MeHg than the pelagic primary consumers (bulk zooplankton). MeHg was significantly and positively related to cysteine content in five of the seven taxa. Despite this, more of the within-taxa variability was explained by [delta]15N, although this does not hold true when isotope data were adjusted for among-system differences in basal [delta]15N. This research generated new knowledge on 1) the importance of phylogenetics, diet, and lake characteristics in determining the amino acid composition of aquatic invertebrates and 2) on cysteine as a predictor of MeHg concentrations within aquatic invertebrates.
Download or read book Biological Effects of Methyl Mercury in Aquatic Systems on Mallards and Scaup written by James Russell Ford and published by . This book was released on 1975 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methylmercury and Neurotoxicity written by Sandra Ceccatelli and published by Springer Science & Business Media. This book was released on 2012-03-23 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury (Hg) is a global pollutant that knows no environmental boundaries. Even the most stringent control of anthropogenic Hg sources will not eliminate exposure given its ubiquitous presence. Exposure to Hg occurs primarily via the food chain due to MeHg’s accumulation in fish. Latest US statistics indicate that 46 States have fish consumption advisories. In addition, Hg is a common pollutant in hazardous waste sites, with an estimated 3-4 million children living within one mile of at least one of the 1,300+ active hazardous waste sites in the US. The effects on intellectual function in children prenatally exposed to MeHg via maternal fish consumption have been the subject of two on-going major, prospective, longitudinal studies in the Seychelles and the Faroe Islands. It is important to recognize that the risk for MeHg exposure is not limited only to islanders with high fish consumption. This book will provide state-of-the-art information to the graduate student training in toxicology, risk assessors, researchers and medical providers at large. It is aimed to bring the reader up to date on contemporary issues associated with exposure to methylmercury, from its effects on stem cells and neurons to population studies.
Download or read book The Toxicity of Methyl Mercury written by Christine U. Eccles and published by . This book was released on 1987 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methyl Mercury in Fish written by and published by . This book was released on 1971 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fish Facts written by Minnesota. Department of Health and published by . This book was released on 1991 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methylmercury a Review of Health Hazards and Side Effects Associated with the Emission of Mercury Compounds Into Natural Systems written by Göran Löfroth and published by . This book was released on 1970 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
