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      DIETARY MERCURY EXPOSURE AND BIOACCUMULATION IN SOUTHERN LEOPARD FROG (RANA SPHENOCEPHALA) LARVAE

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      Environmental Toxicology and Chemistry
      Wiley

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          Abstract

          <p class="first" id="d24185485e57">Aufwuchs was collected from three reservoirs, a constructed wetland used for groundwater treatment, and mercury (Hg)-enriched mesocosms to examine the relationship between inorganic Hg and methylmercury concentrations in the diet of tadpoles. Four diets were then formulated with Hg-enriched aufwuchs to concentrations that bracketed those of Hg observed in aufwuchs from the field and reported in the literature from sites contaminated by atmospheric deposition. The diets were fed to southern leopard frog tadpoles in the laboratory for the entire larval period (60-254 d). Metamorphs and tadpoles were analyzed for inorganic Hg and methylmercury contents by gas chromatography-cold-vapor atomic fluorescence spectrophotometry. Methylmercury concentration increased with total Hg concentration in aufwuchs, but the proportion of methylmercury to inorganic Hg decreased with increasing total Hg concentration. In the feeding experiment, there was an inverse relationship between Hg exposure concentration and the bioaccumulation factor for each Hg species. We concluded that neither methylmercury nor inorganic Hg in aufwuchs is highly bioavailable to tadpoles and that bioaccumulation is not well explained by a simple partitioning model. This suggests that bioaccumulation factors as currently used are not the best predictors of dietary Hg bioaccumulation. </p>

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          Author and article information

          Journal
          Environmental Toxicology and Chemistry
          Environ Toxicol Chem
          Wiley
          0730-7268
          1552-8618
          2004
          2004
          : 23
          : 12
          : 2956
          Article
          10.1897/03-695.1
          15648771
          1470b800-72ed-4b00-bcce-beee8a0f004a
          © 2004

          http://doi.wiley.com/10.1002/tdm_license_1.1

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