Comparing compound-specific and bulk stable nitrogen isotope trophic discrimination factors across multiple freshwater fish species and diets

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  • Chelsey M. Blanke
    Center for Limnology, University of Wisconsin–Madison, 680 N. Park St., Madison, WI 53706, USA.
  • Yoshito Chikaraishi
    Japan Agency for Marine–Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan.
  • Yuko Takizawa
    Japan Agency for Marine–Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan.
  • Shawn A. Steffan
    Department of Entomology, University of Wisconsin–Madison, 1630 Linden Drive, Madison, WI 53706, USA.
  • Prarthana S. Dharampal
    Department of Entomology, University of Wisconsin–Madison, 1630 Linden Drive, Madison, WI 53706, USA.
  • M. Jake Vander Zanden
    Center for Limnology, University of Wisconsin–Madison, 680 N. Park St., Madison, WI 53706, USA.

書誌事項

公開日
2017-08
権利情報
  • http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining
DOI
  • 10.1139/cjfas-2016-0420
公開者
Canadian Science Publishing

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説明

<jats:p> Compound-specific nitrogen stable isotope analysis provides an approach for estimating animal trophic position that may overcome key issues associated with stable isotope analysis of bulk tissue. Yet compound-specific trophic discrimination factors have not been estimated for a broad range of habitats, taxa, and diets. We conducted a controlled-feeding experiment to characterize the variation in compound-specific (TDF<jats:sub>AA</jats:sub>) and bulk (TDF<jats:sub>Bulk</jats:sub>) trophic discrimination factors of four freshwater fish species fed on three distinct diets. We also compared TDF<jats:sub>AA</jats:sub> of fish muscle and scale to evaluate the viability of scales for making food web inferences. Mean ± 1 SD TDF<jats:sub>Bulk</jats:sub> was 2.2‰ ± 0.9‰, and there were significant effects of species and diet trophic position on TDF<jats:sub>Bulk</jats:sub>. Mean ± 1 SD TDF<jats:sub>AA</jats:sub> was 6.9‰ ± 0.8‰. Although there was no effect of species on TDF<jats:sub>AA</jats:sub>, there were significant differences in TDF<jats:sub>AA</jats:sub> across the three diets. TDF<jats:sub>AA</jats:sub> from fish scales were not significantly different from those of muscle. Our study illustrates the advantages of estimating trophic position using compound-specific stable isotopes and the need for continued investigation of factors resulting in variation in TDF values. </jats:p>

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