|
|||||
|
|
Spatial trends and impairment assessment of mercury in sport fish in the Sacramento–San Joaquin Delta watershed |
|
| Authors: | AR Melwani SN Bezalel JA Hunt JL Grenier G Ichikawa W Heim A Bonnema C Foe DG Slotton JA Davis |
| Institution: | a San Francisco Estuary Institute, 7770 Pardee Lane, Oakland, CA 94621, USA b California Department of Fish and Game, 7544 Sandholdt Rd, Moss Landing, CA 95039, USA c Moss Landing Marine Laboratories, 8272 Moss Landing Rd, Moss Landing, CA 95039, USA d Central Valley Regional Water Quality Control Board, 11020 Sun Center Drive #200, Rancho Cordova, CA 95670, USA e Department of Environmental Science and Policy, University of California, Davis, CA 95616, USA |
| Abstract: | 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 μg/g, while redear sunfish, bluegill and rainbow trout exhibited the lowest (<0.15 μg/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. |
| Keywords: | Mercury Fish Sacramento– San Joaquin Delta Spatial trends Human health |
| 本文献已被 ScienceDirect 等数据库收录！ | |