title: Polychlorinated biphenyls, organochlorinated pesticides, and polybrominated diphenyl ethers in the cerebral cortex of wild river otters (Lontra canadensis).
abstract: We measured the levels of ortho-substituted polychlorinated biphenyls (PCB), organochlorinated pesticides (OCP), and polybrominated diphenyl ethers (PBDE) in the cerebral cortex of river otters (Lontra canadensis) trapped from Ontario and Nova Scotia between 2002 and 2004. The mean concentration of total PCBs was 70.9+/-12.1 ng/g l.w., and congeners 153, 180 and 138 accounted for nearly 60% of the sum. The mean concentration of total OCPs was 21.2+/-3.7 ng/g l.w., and hexachlorobenzene (32.6% of total) and DDE (28.1%) accounted for the majority. The mean concentration of total PBDEs was 3.2+/-0.6 ng/g l.w., and congeners 99 (44.9%), 153 (30.5%), and 100 (24.7%) were measured at the indicated percentages. There was no relationship between these residue data and concentrations of brain mercury or neurochemical receptors and enzymes as determined in earlier studies on these same animals.
authors.affiliation: National Wildlife Research Center, Canadian Wildlife Service, Environment Canada, Ottawa, Ontario, K1A 0H3, Canada. nbasu@uottawa.ca
authors.forename: Niladri
authors.initials: N
authors.lastname: Basu
authors.forename: Anton M
authors.initials: AM
authors.lastname: Scheuhammer
authors.forename: Mike
authors.initials: M
authors.lastname: O'Brien
mesh_terms: D000818:Animals; D002540:Cerebral Cortex / Q000737:chemistry*; D003633:Dichlorodiphenyl Dichloroethylene / Q000032:analysis; D005260:Female; D006581:Hexachlorobenzene / Q000032:analysis; D006843:Hydrocarbons, Chlorinated / Q000032:analysis; D008297:Male; D008628:Mercury / Q000032:analysis; D009674:Nova Scotia; D009864:Ontario; D010041:Otters / Q000378:metabolism*; D010573:Pesticide Residues / Q000032:analysis*; D011075:Polybrominated Biphenyls / Q000032:analysis; D011078:Polychlorinated Biphenyls / Q000032:analysis; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010573:Pesticide Residues; D011075:Polybrominated Biphenyls; D014874:Water Pollutants, Chemical; D003633:Dichlorodiphenyl Dichloroethylene; D006581:Hexachlorobenzene; D011078:Polychlorinated Biphenyls; D008628:Mercury