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Report on how mercury (Hg) was examined in top-predator fish, bed sediment, and water from streams that spanned regional and national gradients of Hg source strength and other factors thought to influence methylmercury bioaccum. Sampled settings include stream basins that were agr¿l, urbanized, undeveloped, and mined. Predator fish were targeted for collection, and composited samples of fish were analyzed for total Hg (THg), as most of the Hg found in fish tissue is MeHg. Samples of bed sediment and stream water were analyzed for THg, MeHg, and characteristics thought to affect Hg methylation, such as loss-on-ignition and acid-volatile sulfide in bed sediment, and pH, dissolved organic carbon, and dissolved sulfate in water. Illus.
South Dakota has six lakes and impoundments that exceed mercury fish tissue advisory limits of 1.0 mg kg−1 for consumption. According to the Environmental Protection Agency (EPA), United States fish consumption limits should be at a much lower 0.3 mg kg−1. This study determined water quality parameters that are capable of predicting whether water bodies will have mercury fish tissue concentrations exceeding EPA's threshold fish consumption advisory limit of 0.3 mg kg−1 mercury by statistically comparing mercury fish tissue concentrations to water quality parameters. Phosphorus, alkalinity, pH, DOC, and sulfur have been shown through past studies to influence mercury fish tissue concentration. These water quality parameters, as well as others were collected from the South Dakota Department of Environmental and Natural Resources. (SD DENR). Mercury fish tissue data were collected by the South Dakota Game Fish and Parks (SD GFP). Statistical analyses employed included linear regression, boxplots, binary logistic regression, Akaike's Information Criterion, and stepwise logistic regression. Significant water quality parameters predicting increased mercury concentrations of northern pike in impoundments were phosphorus and pH. For northern pike in natural lakes for this study concluded that alkalinity was the most significant water quality parameter predicting increased mercury concentrations. Mercury concentrations in walleye in natural lakes were influenced by pH and alkalinity.