PT12 Metals and Bioaccumulation
Exhibit Hall
8:00 AM - Tuesday

(PT160) Reservoir effects on downstream contaminant accumulation in biota.

Garvin, N1, Bryan, Jr, A1, Jagoe, C1, Romanek, C1, Brant, H1, 1 University of Georgia's Savannah River Ecology Laboratory, Aiken, SC, USA

ABSTRACT- Biota including redfin pickerel (Esox americanus), lake chubsucker (Erimyzon sucetta), spotted sunfish (Lepomis punctatus), and six crayfish species were sampled from four stream systems to test for associations between contaminant burden and presence of upstream reservoirs. Streams were located on the Savannah River Site (SRS), a federal reservation in South Carolina, USA. Two of the streams drain reservoirs, which may influence contaminant distributions and concentrations in downstream lotic systems. Samples were analyzed for a suite of metals including mercury and radiocesium, as well as stable isotopes of carbon and nitrogen as indicators of carbon source and trophic position. Fish mercury varied among streams, and was generally higher in streams draining reservoirs. Among species, those in higher trophic positions (redfin pickerel) had higher mercury concentrations than lower position species. Many samples had radiocesium concentrations below the method detection limit (about 0.1 Bq/g), confounding comparisons. Results suggest that reservoirs may be an important factor influencing concentrations of some metals in downstream biota.

Key words: radionuclide, reservoir, stable isotopes, mercury

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