Chlorinated hydrocarbon contaminants and metabolites in polar bears (Ursus maritimus) from Alaska, Canada, East Greenland, and Svalbard : 1996-2002
Derek C. G. Muir Andrew E. Derocher Rune Dietz Thomas J. Evans Geir W. Gabrielsen John Nagy Ross J. Norstrom Christian Sonne Ian Stirling Mitch K. Taylor Robert J Letcher E. W. Born Jonathan Verreault Aaron T. Fisk Gregory M. Sandala Wouter Gebbink Frank F. Riget
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A suite of chlorinated hydrocarbon contaminants (CHCs) including organochlorine pesticides (OCPs) and by-products, polychlorinated biphenyls (PCBs), and methyl sulfone (MeSO2) PCB and p,p--dichlorodiphenyldichloroethylene (p,p--DDE) metabolites were determined in adipose tissue of 107 adult and sub-adult polar bears, almost exclusively females, sampled between 1996 and 2002 from populations spanning Arctic and Subarctic regions of Alaska, Canada, East Greenland, and Svalbard. The East Greenland and Svalbard populations of polar bears were distinguished by higher proportions of dichlorodiphenyldichloroethane (DDT)-related compounds, nonachlors, oxychlordane, and higher-chlorinated and persistent PCB congeners (hepta- to nona-chlorinated). Conversely, Alaska, the westernmost population of the North American Arctic, was characterized by higher proportions of relatively volatile compounds such as hexachlorocyclohexanes (HCHs) and pentachlorobenzene (PnCBz), lower-chlorinated PCB congeners (tri- to penta-chlorinated), and lower proportions of oxychlordane...
Science of The Total Environment
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USFWS Alaska - Marine Mammals Management