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M2 AM Aquatic Ecotoxicology (Part 1)
(SIM-1117-733233) Assessing Risk for Photo-enhanced Toxicity of PAHs in Larval Fish of the Coastal Great Lakes.
Simcik, M.1, Swackhamer, D.1, Adams, A1, Lehr, R.1, Mount, D.2, Diamond, S. 2, 1 University of Minnesota, Minneapolis, MN, USA2 US EPA Mid-continent Ecology Division, ORD, Duluth, MN, USA
ABSTRACT- Photo-enhanced toxicity causes mortality in aquatic organisms exposed to sufficient polycyclic aromatic hydrocarbons (PAH) and UV-A radiation. A model for estimating this effect has been developed, but never tested in the field. A component of the Great Lakes Ecological Indicators (GLEI) project set out to evaluate this model for larval fish in the coastal Great Lakes. A surrogate measure for UV penetration was developed to readily estimate UV exposure, and PAH exposures were estimated from measurements of photo-toxic PAHs in larval fish collected from 17 sites around the Great Lakes. In addition, we established the utility of using a BSAF to estimate larval fish concentrations from sediment concentrations. Calculated photo-toxic potentials suggest that there may be sites around the coastal Great Lakes experiencing photo-enhanced toxicity. This model may be a valuable diagnostic indicator for screening aquatic coastal environments for impacts of PAHs on fish populations.
Key words: photo-enhanced toxicity, PAHs, ecological indicators, fish populations
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