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Trophic Transfer and Biotransformation of Polychlorinated Biphenyls in Zebra Mussel, Round Goby and Smallmouth Bass in Lake Erie, USA

Trophic transfer of polychlorinated biphenyl (PCB) congeners in   zebra   mussels (Dreissena polymorpha), round gobies (Neogobius   melanstomus),   and smallmouth bass (Micropterus dolomieu) were assessed in four   sites along the south shore of the west and central basin of Lake   Erie (all sites were in OH, USA). Total PCB levels in smallmouth   bass   (1, 91-1,52  ng/g wet weight) and round gobies (118-256 ng/g wet   weight) were similar among sites despite a west-to-east decrease in   total PCB concentrations in zebra mussels (29-97 ng/g wet weight).   At   all sites, PCB body burden increased three- to fivefold at each   successive trophic level, suggesting biomagnification in this   nonnative food chain. Whereas fish species were dominated by the   hexachlorine homologue, zebra mussels were dominated by penta- and   hexachlorine homologues; the average degree of chlorination of PCBs   was 56.1% for zebra mussels, 6 .4% for round goby, and 59.9% for   smallmouth bass bodies. Predictive structure-activity relationships   based on chemical characteristics, such as the octanol-water   partition coefficient (log Kow), had little predictive power on   bioaccumulation and biotransformation of PCB congeners because of   nonlinearity, threshold relationships, and species-specific   differences. Calculated trophic transfer for the smallmouth bass-  round goby linkage was higher than for the round goby-zebra mussel   linkage. Only when PCB congeners were grouped by chemical structure   first (vicinal [adjacent] H-atom position in the phenyl ring) were   linear relationships achieved. It appeared that the chemical group   to   which each congener belonged influenced biotransformation more than   species-specific (round gobies vs smallmouth bass) differences.   Biotic changes at midtrophic levels, such as exotic species   invasions, may have an increasingly important role in determining   pollutant cycling and hence pollutant residues in top predators.    (PCB's); (PCBs); (PCB); (polychlorinated biphenyls);   (polychlorinated biphenyl); (zebra mussel); (zebra mussels);   (Dreissena polymorpha); (chemicals of concern); (chemical of   concern); (round goby); (round gobies); (Neogobius melanostomus)

Status
In progress
Type
Project
Start Date
End Date
Annex Numbers
Hazardous Polluting Substances - lists
Persistent Toxic Substances
Research & Development
Specific Objectives for toxic substances and effluents
Surveillance and Monitoring
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats

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