Chemical and Physical Controls on Mercury Source Signatures in Stream Fish from the Northeastern United States.

Autor:	Janssen SE; United States Geological Survey, Upper Midwest Water Science Center , Middleton , Wisconsin 53562 , United States., Riva-Murray K; United States Geological Survey, New York Water Science Center , Troy , New York 12180 , United States., DeWild JF; United States Geological Survey, Upper Midwest Water Science Center , Middleton , Wisconsin 53562 , United States., Ogorek JM; United States Geological Survey, Upper Midwest Water Science Center , Middleton , Wisconsin 53562 , United States., Tate MT; United States Geological Survey, Upper Midwest Water Science Center , Middleton , Wisconsin 53562 , United States., Van Metre PC; United States Geological Survey, Texas Water Science Center Austin , Texas 78754 , United States., Krabbenhoft DP; United States Geological Survey, Upper Midwest Water Science Center , Middleton , Wisconsin 53562 , United States., Coles JF; United States Geological Survey, New England Water Science Center Northborough , Massachusetts 01532 , United States.
Jazyk:	angličtina
Zdroj:	Environmental science & technology [Environ Sci Technol] 2019 Sep 03; Vol. 53 (17), pp. 10110-10119. Date of Electronic Publication: 2019 Aug 20.
DOI:	10.1021/acs.est.9b03394
Abstrakt:	Streams in the northeastern U.S. receive mercury (Hg) in varying proportions from atmospheric deposition and legacy point sources, making it difficult to attribute shifts in fish concentrations directly back to changes in Hg source management. Mercury stable isotope tracers were utilized to relate sources of Hg to co-located fish and bed sediments from 23 streams across a forested to urban-industrial land-use gradient within this region. Mass-dependent isotopes (δ 202 Hg) in prey and game fish at forested sites were depleted (medians -0.95 and -0.83 ‰, respectively) in comparison to fish from urban-industrial settings (medians -0.26 and -0.38 ‰, respectively); the forested site group also had higher prey fish Hg concentrations. The separation of Hg isotope signatures in fish was strongly related to in-stream and watershed land-use indicator variables. Fish isotopes were strongly correlated with bed sediment isotopes, but the isotopic offset between the two matrices was variable due to differing ecosystem-specific drivers controlling the extent of MeHg formation. The multivariable approach of analyzing watershed characteristics and stream chemistry reveals that the Hg isotope composition in fish is linked to current and historic Hg sources in the northeastern U.S. and can be used to trace bioaccumulated Hg.
Databáze:	MEDLINE
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