Literaturdatenbank
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Van Dyke, J. U., Hopkins, W. A., & Jackson, B. P. (2013). Influence of relative trophic position and carbon source on selenium bioaccumulation in turtles from a coal fly-ash spill site. Environmental Pollution, 182, 45–52.
Added by: Admin (06 Jan 2014 18:25:27 UTC) |
| Resource type: Journal Article DOI: http://dx.doi.org/10.1016/j.envpol.2013.06.025 BibTeX citation key: VanDyke2013 View all bibliographic details  |
Categories: General Keywords: Emydidae, Graptemys geographica, Graptemys ouachitensis, Habitat - habitat, Kinosternidae, Nordamerika - North America, Pseudemys concinna, Schildkröten - turtles + tortoises, Sternotherus odoratus, Toxikologie - toxicology Creators: Hopkins, Jackson, Van Dyke Collection: Environmental Pollution |
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| Abstract |
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Highlights Stable isotope results showed trophic separation among turtle species. Selenium concentrations did not biomagnify with relative trophic position. Selenium concentrations decreased with increasing δ13C among species. Carbon source influenced Se bioaccumulation in an assemblage of related vertebrates. 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 (15N and 13C) 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 δ15N and Se concentration. Instead, selenium concentrations decreased with increasing δ13C 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. (Graptemys geographica), Ouachita map turtles (Graptemys ouachitensis), common cooters (Pseudemys concinna), stinkpots (Sternotherus odoratus)
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