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Data Collection on Marine Litter Ingestion in Sea Turtles and Thresholds for Good Environmental Status
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Stable isotopic comparison between loggerhead sea turtle tissues.

Hannah B Vander Zanden1, Anton D Tucker, Alan B Bolten

  • 1Archie Carr Center for Sea Turtle Research and Department of Biology, University of Florida, Gainesville, FL, 32611, USA; Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, 84112, USA.

Rapid Communications in Mass Spectrometry : RCM
|August 27, 2014
PubMed
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Stable isotope analysis in loggerhead sea turtles (Caretta caretta) requires tissue-specific conversion factors. This study provides reliable equations to convert between epidermis and scute tissues, enabling accurate comparisons of diet and habitat use data.

Area of Science:

  • Ecology
  • Marine Biology
  • Isotope Geochemistry

Background:

  • Stable isotope analysis is crucial for understanding animal diet and habitat use.
  • Diet-tissue discrimination factors vary by tissue type, complicating direct comparisons.
  • Loggerhead sea turtles (Caretta caretta) are often studied using various tissues for ecological insights.

Purpose of the Study:

  • To calculate reliable tissue-to-tissue conversion factors between loggerhead sea turtle epidermis and scute.
  • To enable accurate integration of isotopic data from different tissues in ecological studies.

Main Methods:

  • Epidermis and scute samples were collected from 33 adult loggerhead sea turtles in Florida.
  • Carbon (δ13C) and nitrogen (δ15N) stable isotope ratios were measured in both tissues.

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  • Linear relationships between the isotopic values of epidermis and scute were analyzed.

    • Main Results:

    • Significant linear relationships were found between the δ13C and δ15N values of epidermis and scute.
    • These relationships indicate that reliable conversions between the two tissues are possible.
    • The study provides specific equations for these conversions.

    Conclusions:

    • Direct comparison of isotopic data from loggerhead sea turtle epidermis and scute has been limited without conversion factors.
    • The derived equations allow for the combination of previously published and future isotopic datasets.
    • Recommendations are made for using linear regressions for tissue-to-tissue conversions in future isotopic studies across organisms.