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首页> 外文期刊>Environmental Science & Technology: ES&T >Ecological Traits of Fish for Mercury Biomonitoring:Insights from Compound-Specific Nitrogen and Stable Mercury Isotopes
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Ecological Traits of Fish for Mercury Biomonitoring:Insights from Compound-Specific Nitrogen and Stable Mercury Isotopes

机译：Ecological Traits of Fish for Mercury Biomonitoring:Insights from Compound-Specific Nitrogen and Stable Mercury Isotopes

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We coupled compound-specific isotopic analyses of nitrogen(N)in amino acids(δ~(13)N_(Glu),δ~(15)N_(Phe)))and mercury stable isotopes(δ~(202)Hg,Δ~(199)Hg)to quantify ecological traits governing the concentration,variability,and source of Hg in largemouth bass(LB)and pike gudgeon(PG)across four rivers,South Korea.PG displayed uniform Hg concentration(56-137 ng/g),trophic position(TP_(corrected); 2.6-3.0,n = 9),and N isotopes in the source amino acid(δ~(15)N_(Phe); 7-13‰),consistent with their specialist feeding on benthic insects.LB showed wide ranges in Hg concentration(45-693 ng/g),TP_(corrected)(2.8-3.8,n = 14),and<δ~(15)N_(Phe)(1.3-16‰),reflecting their opportunistic feeding behavior.Hg sources assessed using Hg isotopes reveal low and uniform Δ~(199)Hg in PG(0.20-0.49‰),similar to Δ~(199)Hg reported in sediments.LB displayed site-specific δ~(202)Hg(-0.61 to-0.04‰)and Δ~(199)Hg(0.53-1.09‰).At the Yeongsan River,LB displayed elevated Δ~(199)Hg and low δ~(15)N_(Phe),consistent with Hg and N sourced from the atmosphere.LB at the Geum River displayed low Δ~(199)Hg and high δ~(15)N_(Phe),both similar to the isotope values of anthropogenic sources.Our results suggest that a specialist fish(PG)with consistent ecological traits and Hg concentration is an effective bioindicator species for Hg.When accounting for Hg sources,however,LB better captures site-specific Hg sources.

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