Dietary overlap and partitioning among three sympatric carcharhinid sharks

Bree Tillett, Mark G Meekan, Iain Field

    Research output: Contribution to journalArticle

    Abstract

    We used stomach content and stable isotope analyses to compare diet as a proxy for ecological similarity among 3 tropical sharks, Carcharhinus leucas, C. amboinensis and the Endangered Glyphis spp. Our analyses suggested that all 3 predators consumed mainly teleost fishes but also preyed on crustaceans, cephalopods and reptiles. Diets varied spatially and through ontogeny. Some juvenile C. leucas sourced prey from the same food web as juvenile C. amboinensis, although prey sources varied among C. leucas nurseries. Dietary overlap existed between sympatric adult C. leucas and C. amboinensis, and both species occupied higher trophic positions than juvenile conspecifics. Although sample sizes for Glyphis spp. were small, our results suggested previously undescribed dietary partitioning between this genus and the sympatric C. leucas.
    Original languageEnglish
    Pages (from-to)283-293
    Number of pages11
    JournalEndangered Species Research
    Volume25
    Issue number3
    DOIs
    Publication statusPublished - 17 Oct 2014

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