Persistent Organic Pollutants in British Columbia Grizzly Bears: Consequence of Divergent Diets
作者： Jennie R. Christensen , Misty MacDuffee , Robie W. Macdonald , Michael Whiticar , Peter S. Ross
DOI: 10.1021/ES050749F
关键词: Oncorhynchus 、 Environmental science 、 Persistent organic pollutant 、 Polybrominated diphenyl ethers 、 Pollutant 、 Bioaccumulation 、 Isotope analysis 、 Pesticide 、 Grizzly Bears 、 Ecology
摘要: 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 late summer to returning Pacific salmon (Oncorynchus spp.). Implications for persistent organic pollutant (POP) concentrations patterns measured the two feeding groups of were profound. While consuming a higher proportion vegetation (“interior” grizzlies) exhibited POP dominated by more volatile organochlorine (OC) pesticides heavier polybrominated diphenyl ethers (PBDEs: e.g., BDE-209), bioaccumulative POPs (e.g., DDT, chlordanes, BDE-47). The ocean-salmon-bear pathway appeared preferentially select those contaminants with intermediate partitioning strength from water into lipid (log Kow ∼ 6.5). This pattern reflects an optimum contaminant log range atmospheric transport, de...
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