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Bioaccumulation Patterns Of PCBs In A Temperate, Freshwater Food Web And Their Relationshop To The Octanol-Water Partition Coefficient (Presentation)
Citation:
Walters, D. M., M. A. MILLS, AND B. S. Cade. Bioaccumulation Patterns Of PCBs In A Temperate, Freshwater Food Web And Their Relationshop To The Octanol-Water Partition Coefficient (Presentation). Presented at 2010 SETAC North America 31st Annual Meeting- Bridging Science with Communities, Portland, OR, November 07 - 11, 2010.
Impact/Purpose:
To investigate polychlorinated biphenyl bioaccumulation relative to octanol-water partition coefficient (KOW) and organism trophic position at the Lake Hartwell Superfund site (South Carolina, USA).
Description:
We investigated polychlorinated biphenyl (PCB) bioaccumulation relative to octanol-water partition coefficient (KOW) and organism tropic position (TP) at the Lake Hartwell Superfund site (South Carolina, USA). We measured PCBs (127 congeners) and stable isotopes (δ15N) is sediment, organic matter, phytoplankton, zooplankton, macroinvertebrates, and fish. TP, as calculated from δ15N, was strongly, linearly related to ΣPCBs, and teh food web magnification factor (FWMF) for Lake Hartwell was 3.05. Highly chlorinated congeners were enriched thorugh the food web, and congener composition suggested alternate benthic and pelagic pathways of PCB accumulation at lower trophic levels. FWMFs of individual congeners increased strongly with log KOW, as did the predictive power (r2) of individual TP-CB regression models used to calculate FWMFs. We developed log KOW-FWMF models for eight food webs with vastly different environments (freshwater, marine, arctic, temperate) and species composition (cold- vs. warmblooded species). The effect of KOW on congener FW