Document Detail


Biomagnification of polybrominated diphenyl ether and hexabromocyclododecane flame retardants in the polar bear food chain in Svalbard, Norway.
MedLine Citation:
PMID:  16986806     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Concentrations of brominated flame retardants (BFRs), including polybrominated diphenylethers (PBDEs) and hexabromocyclododecane (HBCD), were investigated in an arctic marine food chain consisting of four invertebrate species: polar cod (Boreogadus saida), ringed seals (Pusa hispida), and polar bears (Ursus maritimus). 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-based concentrations (LWCs) and whole body-based 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.
Authors:
Eugen Gravningen Sørmo; Maria Pettersvik Salmer; Bjørn Munro Jenssen; Haakon Hop; Kine Baek; Kit Maureen Kovacs; Christian Lydersen; Stig Falk-Petersen; Geir Wing Gabrielsen; Elisabeth Lie; Janneche Utne Skaare
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  25     ISSN:  0730-7268     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-09-21     Completed Date:  2006-10-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2502-11     Citation Subset:  IM    
Affiliation:
Norwegian University of Science and Technology, Department of Biology, NO 7491 Trondheim, Norway.
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MeSH Terms
Descriptor/Qualifier:
Animals
Flame Retardants / analysis*
Food Chain*
Gadiformes / metabolism
Hydrocarbons, Brominated / analysis*,  metabolism
Invertebrates / chemistry
Norway
Phoca / metabolism
Polybrominated Biphenyls / analysis*,  metabolism
Ursidae / physiology*
Water Pollutants, Chemical / analysis,  metabolism
Water Pollution, Chemical
Chemical
Reg. No./Substance:
0/Flame Retardants; 0/Hydrocarbons, Brominated; 0/Polybrominated Biphenyls; 0/Water Pollutants, Chemical; 25637-99-4/hexabromocyclododecane

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


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