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Influence of relative trophic position and carbon source on selenium bioaccumulation in turtles from a coal fly-ash spill site.
- Source :
- Environmental Pollution; Nov2013, Vol. 182, p45-52, 8p
- Publication Year :
- 2013
-
Abstract
- Selenium (Se) is a bioaccumulative constituent of coal fly-ash that can disrupt reproduction of oviparous wildlife. In food webs, the greatest enrichment of Se occurs at the lowest trophic levels, making it readily bioavailable to higher consumers. However, subsequent enrichment at higher trophic levels is less pronounced, leading to mixed tendencies for Se to biomagnify. We used stable isotopes (<superscript>1</superscript> <superscript>5</superscript>N and <superscript>13</superscript>C) in claws to infer relative trophic positions and relative carbon sources, respectively, of seven turtle species near the site of a recently-remediated coal fly-ash spill. We then tested whether Se concentrations differed with relative trophic position or relative carbon source. We did not observe a strong relationship between δ<superscript>15</superscript>N and Se concentration. Instead, selenium concentrations decreased with increasing δ<superscript>13</superscript>C among species. Therefore, in an assemblage of closely-related aquatic vertebrates, relative carbon source was a better predictor of Se bioaccumulation than was relative trophic position. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 02697491
- Volume :
- 182
- Database :
- Supplemental Index
- Journal :
- Environmental Pollution
- Publication Type :
- Academic Journal
- Accession number :
- 90433889
- Full Text :
- https://doi.org/10.1016/j.envpol.2013.06.025