Document Detail

Persistent organic pollutants in British Columbia grizzly bears: consequence of divergent diets.
MedLine Citation:
PMID:  16201616     Owner:  NLM     Status:  MEDLINE    
Nitrogen and carbon stable isotope signatures in growing hair reveal that while some British Columbia grizzly bears (Ursus arctos horribilis) rely entirely on terrestrial foods, others switch in late summer to returning Pacific salmon (Oncorynchus spp.). Implications for persistent organic pollutant (POP) concentrations and patterns measured in the two feeding groups of grizzly bears were profound. While the bears consuming a higher proportion of terrestrial vegetation ("interior" grizzlies) exhibited POP patterns dominated bythe more volatile organochlorine (OC) pesticides and the heavier polybrominated diphenyl ethers (PBDEs: e.g., BDE-209), the bears consuming salmon were dominated by the more bioaccumulative POPs (e.g., DDT, chlordanes, and BDE-47). The ocean-salmon-bear pathway appeared to preferentially select for those contaminants with intermediate partitioning strength from water into lipid (log Kow approximately 6.5). This pattern reflects an optimum contaminant log Kow range for atmospheric transport, deposition into the marine environment, uptake into marine biota, accumulation through the food web, and retention in the bear tissues. We estimate that salmon deliver 70% of all OC pesticides, up to 85% of the lower brominated PBDE congeners, and 90% of PCBs found in salmon-eating grizzly bears, thereby inextricably linking these terrestrial predators to contaminants from the North Pacific Ocean.
Jennie R Christensen; Misty MacDuffee; Robie W Macdonald; Michael Whiticar; Peter S Ross
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  39     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-10-05     Completed Date:  2005-12-12     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6952-60     Citation Subset:  IM    
Institute of Ocean Sciences, Fisheries & Oceans Canada, P.O. Box 6000, 9860 West Saanich Road, Sidney, British Columbia V8L 4B2, Canada.
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MeSH Terms
Animal Nutritional Physiological Phenomena*
British Columbia
Carbon / analysis
Chlorine / analysis
Environmental Monitoring / methods*
Environmental Pollutants / analysis
Models, Statistical
Models, Theoretical
Nitrogen / analysis
Organic Chemicals / analysis*
Pacific Ocean
Pesticides / analysis
Polybrominated Biphenyls / analysis
Polychlorinated Biphenyls / analysis
Reg. No./Substance:
0/Environmental Pollutants; 0/Organic Chemicals; 0/Pesticides; 0/Polybrominated Biphenyls; 0/Polychlorinated Biphenyls; 7440-44-0/Carbon; 7727-37-9/Nitrogen; 7782-50-5/Chlorine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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