PW10 Bioaccumulation and Biomagnification
Exhibit Hall
8:00 AM - Wednesday

(PW178) Bioaccumulation and Tissue Distribution of PCB and PBDE Metabolites in the Deepwater Sculpin Food Chain From Lake Huron.

Scipione, G1, Whittle, M2, Letcher, R1, 1 University of Windsor, Windsor, Ontario, Canada2 Department of Fisheries and Oceans, Great Lakes Laboratory for Fisheries and Aquatic Sciences, Burlington, Ontario, Canada

ABSTRACT- Burbot (Lota lota), deepwater sculpin (Myoxocephalus thompsoni) and the benthic amphipod Diporeia hoyi comprise a food chain that is common in Lake Huron. In July 2003, five burbot, five pools of five sculpin and two pools of diporeia were sampled from Lake Huron. We recently identified polychlorinated biphenyls (PCBs) and polybrominated diphenyl ether (PBDE) flame retardants and methylsulfonyl (MeSO2) PCB, hydroxyl (HO) PCB and PBDE metabolites in tissues of deepwater sculpin and burbot. We presently report on the bioaccumulation (e.g. biomagnification factors) and tissue distribution (i.e. plasma, liver and whole body homogenate) of quantified congener residues of PCBs, PBDEs, MeSO2-PCBs and (HO)-PCB and (HO)-PBDE metabolites in this food chain. Relative to homogenate levels, liver concentrations of PBDEs (dominated by BDE-47) were higher for sculpin and burbot. MeSO2-PCB levels in both burbot and sculpin indicate that these metabolites tend to preferentially localize in the liver, and are accumulated from sculpin to burbot. More highly chlorinated HO-PCB congeners and higher concentrations were found in burbot liver relative to plasma. HO-PBDEs in burbot liver and plasma were dominated by HO-BDE-47 metabolites. Biomagnification factors are compared and contrasted and especially the metabolite classes verses their parent compounds. Whether metabolically formed or accumulated through the food chain, exposure of burbot and sculpin to MeSO2-PCBs, HO-PCBs and OH-PBDEs is a contaminant concern in these species from Lake Huron.

Key words: Lake Huron, deepwater sculpin, PBDEs, PCBs

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