气候变化领域集成服务门户(CCPortal): Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan

CCPortal

DOI	10.1073/pnas.1907484116
	Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan
	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.
发表日期	2019
ISSN	0027-8424
起始页码	23600
结束页码	23608
卷号	116 期号:47
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.
英文关键词	Fish; Invasive; Isotopes; Lake Michigan; Mercury
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160428
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 Laborato...
推荐引用方式 GB/T 7714	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],2019,116(47).
APA	Lepak R.F..,Hoffman J.C..,Janssen S.E..,Krabbenhoft D.P..,Ogorek J.M..,...&Hurley J.P..(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).
MLA	Lepak R.F.,et al."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).