globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1907484116
论文题名:
Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan
作者: Lepak R.F.; Hoffman J.C.; Janssen S.E.; Krabbenhoft D.P.; Ogorek J.M.; DeWild J.F.; Tate M.T.; Babiarz C.L.; Yin R.; Murphy E.W.; Engstrom D.R.; Hurley J.P.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:47
起始页码: 23600
结束页码: 23608
语种: 英语
英文关键词: Fish ; Invasive ; Isotopes ; Lake Michigan ; Mercury
Scopus关键词: carbon 13 ; delta carbon 13 ; delta mercury 202 ; delta nitrogen 15 ; mercury ; nitrogen 15 ; radioisotope ; unclassified drug ; Article ; benthos ; bioaccumulation ; concentration (parameter) ; controlled study ; dry weight ; fish ; fishery ; food web ; lake ; Michigan ; nonhuman ; predation ; priority journal ; sediment ; spawning ; trend study ; United States
英文摘要: 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 δ202Hg increased (0.4) 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 δ202Hg 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. © 2019 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163621
Appears in Collections:气候变化与战略

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作者单位: Lepak, R.F., Environmental Chemistry and Technology Program, University of Wisconsin–Madison, Madison, WI 53706, United States, US Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, Middleton, WI 53562, United States; Hoffman, J.C., 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, United States; Janssen, S.E., US Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, Middleton, WI 53562, United States; Krabbenhoft, D.P., US Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, Middleton, WI 53562, United States; Ogorek, J.M., US Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, Middleton, WI 53562, United States; DeWild, J.F., US Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, Middleton, WI 53562, United States; Tate, M.T., US Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, Middleton, WI 53562, United States; Babiarz, C.L., US Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, Middleton, WI 53562, United States; Yin, R., Environmental Chemistry and Technology Program, University of Wisconsin–Madison, Madison, WI 53706, United States, State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guanshanhu District, Guiyang, Guizhou 550081, China; Murphy, E.W., Great Lakes National Program Office, US EPA, Chicago, IL 60604, United States; Engstrom, D.R., St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St., Croix, MN 55047, France; Hurley, J.P., Environmental Chemistry and Technology Program, University of Wisconsin–Madison, Madison, WI 53706, United States, Department of Civil and Environmental Engineering, University of Wisconsin–Madison, Madison, WI 53706, United States, University of Wisconsin Aquatic Sciences Center, Madison, WI 53706, United States

Recommended Citation:
Lepak R.F.,Hoffman J.C.,Janssen S.E.,et al. 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,2019-01-01,116(47)
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