期刊
ENVIRONMENTAL POLLUTION
卷 157, 期 11, 页码 3137-3149出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.05.013
关键词
Mercury; Fish; Sacramento-San Joaquin Delta; Spatial trends; Human health
A three-year study was conducted to examine mercury in sport fish from the Sacramento-San Joaquin Delta. More than 4000 fish from 31 species were collected and analyzed for total mercury in individual muscle filets. Largemouth bass and striped bass were the most contaminated, averaging 0.40 mu g/g, while redear sunfish, bluegill and rainbow trout exhibited the lowest (<0.15 mu g/g) concentrations. Spatial variation in mercury was evaluated with an analysis of covariance model, which accounted for variability due to fish size and regional hydrology. Significant regional differences in mercury were apparent in size-standardized largemouth bass, with concentrations on the Cosumnes and Mokelumne rivers significantly higher than the central and western Delta. Significant prey-predator mercury correlations were also apparent, which may explain a significant proportion of the spatial variation in the watershed. (C) 2009 Elsevier Ltd. All rights reserved.
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