Download or read book Water and Sediment Chemistry Influences on Mercury Bioaccumulation in Freshwater Invertebrates from Two Lakes in Kejimkujik National Park Nova Scotia written by Rachel G. Clarke and published by . This book was released on 2019 with total page 73 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 Selected Water Resources Abstracts written by and published by . This book was released on 1987 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Chemistry and Toxicology of Mercury written by Guangliang Liu and published by John Wiley & Sons. This book was released on 2011-11-07 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the fundamentals, recent developments, and future research needs for critical mercury transformation and transport processes, as well as the experimental methods that have been employed in recent studies. The coverage discusses the environmental behavior and toxicological effects of mercury on organisms, including humans, and provides case studies at the end of each chapter. Bringing together information normally spread across several books, this text is unique in covering the entire mercury cycle and providing a baseline for what is known and what uncertainties remain in respect to mercury cycling.

Download or read book Proceedings of the 37th Annual Aquatic Toxicity Workshop written by T. Fletcher and published by . This book was released on 2011 with total page 174 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 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 Mercury Bioaccumulation Through Food Webs in Acidic Lakes at Kejimkujik National Park and National Historic Site Nova Scotia written by Brianna Wyn and published by . This book was released on 2007 with total page 314 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 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 Selected Water Resources Abstracts written by and published by . This book was released on 1987 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoreactions of Mercury in the Freshwater Lakes of Kejimkujik National Park Nova Scotia written by Emma E. Vost and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury is a globally distributed, toxic environmental contaminant. Divalent mercury (Hg(II)) in freshwater lakes is reduced to volatile elemental mercury (Hg(0)) through reactions with Dissolved Organic Matter (DOM) and energy from solar radiation. Samples were collected from ten lakes in Kejimkujik National Park, Nova Scotia in May, 2008, 2009 and August 2010 and analysed for DOC (ranging 1.4 - 15.4 mg L-1), attenuation, anions, cations, and mercury photoreduction and oxidation rates. An integrated pseudo first order reaction equation was found to fit the gross reduction data extremely well (R2 value of >0.98; p value

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 Aquatic Systems written by Harvey W. Holm and published by . This book was released on 1974 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ecosystem Responses to Mercury Contamination written by Reed Harris and published by CRC Press. This book was released on 2007-03-05 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: As rising levels of mercury in the environment pose an increasing threat of toxicity to humans and wildlife, several laws already call for industries to reduce mercury emissions at the source. Ecosystem Responses to Mercury Contamination: Indicators of Change outlines the infrastructure and methods needed to measure, monitor, and regulate the conce

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 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.