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- W1964580604 abstract "Invertebrates are a key, but poorly quantified link in the transfer of PCBs from sediments and the water column to predatory fishes of Great Lakes pelagic food webs. We collected two size classes of Lake Michigan net plankton (63 to 243 μm, 243+ μm) plus macroinvertebrates during a cruise off Grand Haven, Michigan in the fall of 1995. Mean concentrations (± 2 SE) of total PCBs were 117.77 (27.03), 1106.88 (553.69), and 353.67 (66.99) ng/g dry weight for copepods and cladocerans, Diporeia spp., and Mysis relicta, respectively. Diporeia is significantly more contaminated than Mysis when PCB concentrations are expressed on a dry weight (0.02 < p < 0.05) and lipid (0.02 < p < 0.05) normalized basis, but not on afresh weight basis (0.2 < p < 0.5). Mysis and Diporeia are significantly more contaminated than copepods and cladocerans regardless of the normalization metric. The relative degree of contamination is similar to the early 1980s. The largest component of the total PCBs shifts from tetra- and pentachlorobiphenyls for the 243+ μm and 63 to 243 μm fractions, respectively, to hexachlorobiphenyls for Mysis and Diporeia. Even though total PCBs have been declining in Great Lakes biota during the last two decades, the enrichment with trophic level of hexachlorobiphenyls, which are associated with elevated biological acitivity, may lead to a greater impact of PCBs in top predators than would be expected by considering only the decreasing pattern of total PCBs." @default.
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- W1964580604 date "1998-01-01" @default.
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- W1964580604 title "Current Concentrations of PCBs in Lake Michigan Invertebrates, a Prediction Test, and Corroboration of Hindcast Concentrations" @default.
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- W1964580604 doi "https://doi.org/10.1016/s0380-1330(98)70863-9" @default.
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