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The most abundant BFR, brominated diphenyl ether (BDE)-47, was found in detectable concentrations even in zooplankton, the lowest trophic level examined in this study. Most of the investigated BFRs biomagnified as function of tropic level in the food chain. A noticeable exception occurred at the highest trophic level, the polar bear, in which only BDE-153 was found to increase from its main prey, the ringed seal, indicating that polar bears appear to be able to metabolize and biodegrade most BFRs. In contrast, lower-brominated PBDEs, particularly BDE-47, showed clear signs of bioaccumulation in zooplankton, polar cod, and ringed seals. We suggest that this discrepancy in the fate of BFRs among the different species may be related to greater induction of oxidative detoxification activities in the polar bear. Absorption and debromination rates may be more important for bioaccumulation rates of BFRs in zooplankton, polar cod, and ringed seals. Lipid weight\u2013based concentrations (LWCs) and whole body\u2013based concentrations (WBCs) of BFRs were used to assess biomagnification factors (BMFs). Whole-body concentrations gave the most realistic BMFs, as BMFs derived from LWCs seem to be confounded by the large variability in lipid content of tissues from the investigated species. This study demonstrates that PBDEs and HBCD have reached measurable concentrations even in the lower trophic levels (invertebrates and fish) in the Arctic and biomagnifies in the polar bear food chain.<\/jats:p>","DOI":"10.1897\/05-591r.1","type":"journal-article","created":{"date-parts":[[2006,8,31]],"date-time":"2006-08-31T20:53:09Z","timestamp":1157057589000},"page":"2502-2511","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":125,"title":["Biomagnification of polybrominated diphenyl ether and hexabromocyclododecane flame retardants in the polar bear food chain in Svalbard, Norway"],"prefix":"10.1093","volume":"25","author":[{"given":"Eugen Gravningen","family":"S\u00f8rmo","sequence":"first","affiliation":[{"name":"Norwegian University of Science and Technology, Department of Biology, NO 7491 Trondheim, Norway"}]},{"given":"Maria Pettersvik","family":"Salmer","sequence":"additional","affiliation":[{"name":"Norwegian 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