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Dietary Accumulation of Inorganic Selenium by a Larval Amphibian (Hyla chrysoscelis) and Influence on Accumulation of Background Mercury

Abstract

Larval gray tree frogs (Hyla chrysoscelis) were exposed to inorganic Se (SeO2) added to the diet (10.2 and 86.3 ug/g dw) and monitored for accumulation and effect. Background concentrations of Hg were also measured in food and carcasses to assess possible effects of Se on Hg accumulation. Selenium was accumulated in a dose dependent manner, and life stages did not differ. No effects of Se exposure were observed on survival, growth, or time to metamorphosis. Mercury concentrations in carcasses, resulting from background concentrations in food, were significantly affected by the presence of Se. In the high Se treatment, Hg concentrations were significantly decreased relative to those in the low Se treatment and the control. Our study suggests that exposure to inorganic Se as SeO2 at the concentrations tested do not elicit adverse biological effects, but exposure to relatively high concentrations of Se may reduce accumulation of Hg from food.

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Acknowledgements

Contribution 5315 of the University of MD Center for Environmental Science.

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Correspondence to Christopher L. Rowe.

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Rowe, C.L., Heyes, A. Dietary Accumulation of Inorganic Selenium by a Larval Amphibian (Hyla chrysoscelis) and Influence on Accumulation of Background Mercury. Bull Environ Contam Toxicol 99, 182–186 (2017). https://doi.org/10.1007/s00128-017-2087-5

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Keywords

  • Coal ash
  • Coal combustion residues
  • Bioaccumulation
  • Metals
  • Antagonism