Influence of relative trophic position and carbon source on selenium bioaccumulation in turtles from a coal fly-ash spill site

James U Van Dyke, William A Hopkins, Brian P Jackson

Research output: Contribution to journalArticle

13 Citations (Scopus)

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. © 2013 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)45-52
Number of pages8
JournalEnvironmental Pollution
Volume182
DOIs
Publication statusPublished - 2013

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Coal Ash
Bioaccumulation
Turtles
Coal
Selenium
Hazardous materials spills
Fly ash
Carbon
Oviparity
Hoof and Claw
Food Chain
Isotopes
Reproduction
Vertebrates

Cite this

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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. {\circledC} 2013 Elsevier Ltd. All rights reserved.",
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Influence of relative trophic position and carbon source on selenium bioaccumulation in turtles from a coal fly-ash spill site. / Van Dyke, James U; Hopkins, William A; Jackson, Brian P.

In: Environmental Pollution, Vol. 182, 2013, p. 45-52.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Influence of relative trophic position and carbon source on selenium bioaccumulation in turtles from a coal fly-ash spill site

AU - Van Dyke, James U

AU - Hopkins, William A

AU - Jackson, Brian P

PY - 2013

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N2 - 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. © 2013 Elsevier Ltd. All rights reserved.

AB - 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. © 2013 Elsevier Ltd. All rights reserved.

U2 - 10.1016/j.envpol.2013.06.025

DO - 10.1016/j.envpol.2013.06.025

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