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Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan
Ryan F. Lepak;  Joel C. Hoffman;  Sarah E. Janssen;  David P. Krabbenhoft;  Jacob M. Ogorek;  John F. DeWild;  Michael T. Tate;  Christopher L. Babiarz;  Runsheng Yin;   Elizabeth W. Murphy;  Daniel R. Engstrom;   James P. Hurley
2019
发表期刊Proceedings Of The National Academy Of Sciences Of The United States Of America
卷号116期号:47页码:23600–23608
摘要

To understand the impact reduced mercury (Hg) loading and invasive species have had on methylmercury bioaccumulation in predator fish of Lake Michigan, we reconstructed bioaccumulation trends from a fish archive (1978 to 2012). By measuring fish Hg stable isotope ratios, we related temporal changes in Hg concentrations to varying Hg sources. Additionally, dietary tracers were necessary to identify food web influences. Through combined Hg, C, and N stable isotopic analyses, we were able to differentiate between a shift in Hg sources to fish and periods when energetic transitions (from dreissenid mussels) led to the assimilation of contrasting Hg pools (2000 to present). In the late 1980s, lake trout delta Hg-202 increased (0.4 parts per thousand) from regulatory reductions in regional Hg emissions. After 2000, C and N isotopes ratios revealed altered food web pathways, resulting in a benthic energetic shift and changes to Hg bioaccumulation. Continued increases in delta Hg-202 indicate fish are responding to several United States mercury emission mitigation strategies that were initiated circa 1990 and continued through the 2011 promulgation of the Mercury and Air Toxics Standards rule. Unlike archives of sediments, this fish archive tracks Hg sources susceptible to bioaccumulation in Great Lakes fisheries. Analysis reveals that trends in fish Hg concentrations can be substantially affected by shifts in trophic structure and dietary preferences initiated by invasive species in the Great Lakes. This does not diminish the benefits of declining emissions over this period, as fish Hg concentrations would have been higher without these actions.

关键词Isotopes Invasive Fish Mercury Lake Michigan
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10155
专题矿床地球化学国家重点实验室
作者单位1.Environmental Chemistry and Technology Program, University of Wisconsin–Madison, Madison, WI 53706
2.US Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, Middleton, WI 53562
3.US Environmental Protection Agency (US EPA) Office of Research and Development, Center for Computational Toxicology and Exposure, Great Lakes Toxicology and Ecology Division, Duluth, MN 55804
4.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guanshanhu District, 550081 Guiyang, Guizhou, China
5.Great Lakes National Program Office, US EPA, Chicago, IL 60604
6.St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, MN 55047
7.Department of Civil and Environmental Engineering, University of Wisconsin–Madison, Madison, WI 53706
8.University of Wisconsin Aquatic Sciences Center, Madison, WI 53706
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GB/T 7714
Ryan F. Lepak;Joel C. Hoffman;Sarah E. Janssen;David P. Krabbenhoft;Jacob M. Ogorek;John F. DeWild;Michael T. Tate;Christopher L. Babiarz;Runsheng Yin; Elizabeth W. Murphy;Daniel R. Engstrom; James P. Hurley. Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan[J]. Proceedings Of The National Academy Of Sciences Of The United States Of America,2019,116(47):23600–23608.
APA Ryan F. Lepak;Joel C. Hoffman;Sarah E. Janssen;David P. Krabbenhoft;Jacob M. Ogorek;John F. DeWild;Michael T. Tate;Christopher L. Babiarz;Runsheng Yin; Elizabeth W. Murphy;Daniel R. Engstrom; James P. Hurley.(2019).Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan.Proceedings Of The National Academy Of Sciences Of The United States Of America,116(47),23600–23608.
MLA Ryan F. Lepak;Joel C. Hoffman;Sarah E. Janssen;David P. Krabbenhoft;Jacob M. Ogorek;John F. DeWild;Michael T. Tate;Christopher L. Babiarz;Runsheng Yin; Elizabeth W. Murphy;Daniel R. Engstrom; James P. Hurley."Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan".Proceedings Of The National Academy Of Sciences Of The United States Of America 116.47(2019):23600–23608.
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