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    Predicting trophic position in sharks of the north-west Atlantic Ocean using stable isotope analysis

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    Estrada Predicting.pdf (126.4Kb)
    Date
    2004-01-08
    Author
    Estrada, James A.  Concept link
    Rice, Aaron N.  Concept link
    Lutcavage, Molly E.  Concept link
    Skomal, Gregory B.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/163
    As published
    https://doi.org/10.1017/S0025315403008798
    DOI
    10.1017/S0025315403008798
    Keyword
     Prionace glauca; Isurus oxyrinchus; Alopias vulpinus; Cetorhinus maximus; Trophic positions 
    Abstract
    Trophic positions (TP) were estimated for the blue shark (Prionace glauca), shortfin mako (Isurus oxyrinchus), thresher shark (Alopias vulpinus), and basking shark (Cetorhinus maximus) using stable isotope ratios of carbon ([delta]13C) and nitrogen ([delta]15N). The basking shark had the lowest TP (3·1) and [delta]15N value (10·4‰), whereas the thresher shark had the highest values (4·5, 15·2‰). Mako sharks showed considerable variation in TP and isotopic values, possibly due to foraging from both inshore and offshore waters. Thresher sharks were significantly more enriched in [delta]15N than blue sharks and mako sharks, suggesting a different prey base. The [delta]13C values of thresher sharks and mako sharks varied significantly, but neither was significantly different from that of blue sharks. No statistical differences were found between our TP estimations and those derived from published stomach contents analyses, indicating that stable isotope data may be used to estimate the trophic status of sharks.
    Description
    Author Posting. © Cambridge University Press, 2003. This article is posted here by permission of Cambridge University Press for personal use, not for redistribution. The definitive version was published in Journal of the Marine Biological Association of the UK 83 (2003): 1347-1350, doi:10.1017/S0025315403008798.
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    • Boston University Marine Program (BUMP)
    Suggested Citation
    Journal of the Marine Biological Association of the UK 83 (2003): 1347-1350
     

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