Concentrations and Fluxes of Salmon-Derived Polychlorinated Biphenyls (PCBs) in Lake Sediments
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- 作者：Eva M. Krü ; mmel ; Irene Gregory-Eaves ; Robie W. Macdonald ; Lynda E. Kimpe ; Marc J. Demers ; John P. Smol ; Bruce Finney ; and Jules M. Blais
- 刊名：Environmental Science & Technology
- 出版年：2005
- 出版时间：September 15, 2005
- 年：2005
- 卷：39
- 期：18
- 页码：7020 - 7026
- 全文大小：366K
- 年卷期：v.39,no.18(September 15, 2005)
- ISSN：1520-5851
文摘
Fourteen sediment cores were collected from 10 lakesspanning a large gradient of sockeye salmon returns (0-40 000 spawners km-2) in Alaska and British Columbiain 1995-98 and 2002/03. The cores were analyzed for 210Pbto determine sedimentation rates and focusing factors.Polychlorinated biphenyl (PCBs) concentrations in the surfacesediments (0-2 cm) were highly correlated with thenumber of sockeye salmon returns to each nursery lake.For 2002/03, the correlation between PCB concentration andnumber of salmon spawners was best with no correctionfactors applied, but decreased considerably whencorrected for sedimentation rates, and was improvedagain by correcting for sediment focusing. Although 
PCBconcentrations were similar in 1995-98 and 2002/03, thecongener patterns varied. Because salmon are the dominantsource of PCBs for most of these lakes, variation insediment congener pattern likely derives from variation incongener patterns carried by the salmon. Overall, totalPCB input by salmon has remained relatively constant since1995. Unlike temperate Great Lakes contaminant studies,the North American west-coast lakes dominated by salmonbio-transport showed no sign of recent decrease inPCBs.
PCBconcentrations were similar in 1995-98 and 2002/03, thecongener patterns varied. Because salmon are the dominantsource of PCBs for most of these lakes, variation insediment congener pattern likely derives from variation incongener patterns carried by the salmon. Overall, totalPCB input by salmon has remained relatively constant since1995. Unlike temperate Great Lakes contaminant studies,the North American west-coast lakes dominated by salmonbio-transport showed no sign of recent decrease inPCBs.