P866 Determining the trophic level at which Cd and hydrogen ions compete for biological uptake sites in the food chain leading to the biomonitor Chaoborus. ORVOINE, JORD*,1, Hare, Landis1, Tessier, Andre1, 1 UNIVERSITE DU QUEBEC INRS-ETE, QUEBEC, QUEBEC, CANADA

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P867 Trophic Transfer of POPs in Lake Trout Food Webs in Canada and Northern USA. Muir, Derek*,1, Anderson, Robin2, Drouillard, Ken3, Evans, Marlene4, Fairchild, Wayne5, Guildford, Stephanie6, Haffner, Doug3, Kidd, Karen7, Payne, Jerry2, Whittle, Mike8, 1 National Water Research Institute, Burlington, ON2 Fisheries & Oceans, St. Johns, NF3 University of Windsor, Windsor, ON4 National Water Research Institute, Saskatoon, SK5 Fisheries & Oceans, Moncton, NB6 University of Waterloo, Waterloo, ON7 Fisheries & Oceans, Winnipeg, MB8 Fisheries & Oceans, Burlington, ON

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P868 Intestinal absorption, toxicokinetics and biomagnification of POPs: new developments and hypotheses. Kelly, Barry*,1, Gobas, Frank1, 1 Simon Fraser University, Burnaby, British Columbia, Canada

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P869 Body burden and toxic equivalents (TEQs) of polychlorinated dibenzo-p-dioxins, dibenzofurans and bipheyls in the round goby and smallmouth bass . Kwon, Tae-Dong*,1,2, Fisher, Susan1, Kim, Jang-Eok2, 1 The Ohio State University, Dept. of Entomology, Columbus, OH2 Kyungpook National University, Dept. of Agricultural Chemistry, Daegu, Rep.of Korea

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P870 The relationship between phytoplankton composition, phytoplankton nutrient status and PCBs in lake trout in 25 lakes. Guildford, Stephanie*,1, Muir, Derek2, Kling, Hedy3, Drouillard, Ken4, Evans, Marlene5, Kidd, Karen6, Payne, Jerry7, Whittle, Mike8, Wang, Xiaowa2, 1 University of Waterloo, Waterloo, ON, Canada2 National Water Research Institute, Burlington, ON, Canada3 Algal Taxonomy and Ecolgy, Winnipeg, MB, Canada4 Universtiy of Windsor, Windsor, ON, Canada5 National Water Research Institute, Saskatoon, SK, Canada6 Freshwater Institute, Winnipeg, MB7 Fisheries and Oceans, St. Johns, NF, Canada8 Fisheries and Oceans, Burlington, ON

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P871 Use of a Physiologically Based Toxicokinetic Model to Simulate Chronic Dietary Exposures in Fish. Nichols, John*,1, Fitzsimmons, Patrick1, Whiteman, Frank1, 1 U.S. EPA, ORD/NHEERL, Mid-Continent Ecology Division, Duluth, MN, USA

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P872 Comparison of Stable-Nitrogen (15N/14N) Isotope Ratios in Largemouth Bass (Micropterus salmoides) Scales and Muscle Tissue. Ryba, Stephan*,1, Lake, James1, Osterman, Frank1, McKinney, Richard1, 1 U.S. EPA ORD NHEERL AED, Narragansett, RI, USA

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P873 Dietary uptake, internal distribution and metabolism of phthalate esters in Staghorn sculpin (Leptocottus armatus). Webster, Glenys*,1, Gobas, Frank1, Mackintosh, Cheryl1, Ikonomou, Michael2, 1 Simon Fraser University, Burnaby, BC, Canada2 Institute for Ocean Sciences, Sidney, BC, Canada

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P874 Food web comparison of Lepisosteus oculatus and Micropterus salmoides in a Louisiana bayou. Kunas, Myra*,1, Bart, Henry1, Watanabe, Karen1, 1 Tulane University, New Orleans, LA, USA

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P875 BAFs and BSAFs for Chlorinated Dioxins and Furans. Lukasewycz, Marta*,1, Burkhard, Lawrence1, Butterworth, Brian1, Cook, Phillip1, 1 U.S. EPA, National Health and Environmental Effects Research Laboratory, Mid-Continent, Ecology Division, Duluth, MN, USA

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P876 PAHs in the Lake Michigan Aquatic Ecosystem. Fernandez, Joseph*,1, Burkhard, Lawrence1, Cook, Philip1, Nichols, John1, 1 Mid-Continent Ecology Division, U.S. EPA, Duluth, MN, USA

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P877 Uptake of PCB 153 in fathead minnows through food chain of sediment-midge-fish. Choi, Kyungho*,1, Meier, Peter2, 1 URS Corporation, Chicago, IL, USA2 University of Michigan, Ann Arbor, MI, USA

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P877a The subcellular distribution of Cd and Zn in brine shrimp: implications for trophic transfer. Seebaugh, David*,1, Wallace, William1, 1 Center for Enviornmental Science, College of Staten Island, CUNY, Staten Island, New York, USA

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