A new method to reconstruct fish diet and movement patterns from δ<sup>13</sup>C values in otolith amino acids

DOI Web Site Web Site 被引用文献4件
  • Kelton W. McMahon
    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, Joint Program in Oceanography and Ocean Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
  • Marilyn L. Fogel
    Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, USA.
  • Beverly J. Johnson
    Department of Geology, Bates College, Lewiston, ME 04240, USA.
  • Leah A. Houghton
    Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
  • Simon R. Thorrold
    Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
  • Bronwyn Gillanders
    editor

書誌事項

公開日
2011-08
権利情報
  • http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining
DOI
  • 10.1139/f2011-070
公開者
Canadian Science Publishing

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説明

<jats:p>Fish ecologists have used geochemical values in otoliths to examine habitat use, migration, and population connectivity for decades. However, it remains difficult to determine an unambiguous dietary δ<jats:sup>13</jats:sup>C signature from bulk analysis of otolith. Studies to date have focused on the aragonite component of otoliths with less attention paid to the organic fraction. We describe the application of compound-specific stable isotope analysis (SIA) to analyze amino acid (AA) δ<jats:sup>13</jats:sup>C values from small amounts (<1 mg) of otolith powder. We examined δ<jats:sup>13</jats:sup>C values of otolith and muscle AAs from a reef-associated snapper (Lutjanus ehrenbergii (Peters, 1869)) collected along a carbon isotope gradient (isoscape) from seagrass beds to coral reefs. Carbon isotope values in otolith and muscle samples were highly correlated within and among coastal habitats. Moreover, δ<jats:sup>13</jats:sup>C values of otolith AAs provided a purely dietary record that avoided dilution from dissolved inorganic carbon. Otolith AAs served as a robust tracer of δ<jats:sup>13</jats:sup>C values at the base of the food web, making compound-specific SIA a powerful tool for dietary reconstructions and tracking the movement of fishes across isoscapes.</jats:p>

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