Dietary overlap and partitioning among three sympatric carcharhinid sharks

Bree Tillett, Mark G Meekan, Iain Field

    Research output: Contribution to journalArticleResearchpeer-review

    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

    Fingerprint

    dietary overlap
    shark
    partitioning
    diet
    cephalopod
    stomach content
    ontogeny
    teleost
    reptile
    crustacean
    food web
    stable isotope
    predator
    fish

    Cite this

    Tillett, Bree ; Meekan, Mark G ; Field, Iain. / Dietary overlap and partitioning among three sympatric carcharhinid sharks. In: Endangered Species Research. 2014 ; Vol. 25, No. 3. pp. 283-293.
    @article{70ea31a315134bc7a7db35a00069b3ea,
    title = "Dietary overlap and partitioning among three sympatric carcharhinid sharks",
    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.",
    keywords = "coexistence, dietary overlap, food web, isotopic analysis, niche partitioning, shark, stable isotope, stomach content, trophic conditions, trophic structure, Carcharhinidae, Carcharhinus, Carcharhinus amboinensis, Carcharhinus leucas, Cephalopoda, Chondrichthyes, Crustacea, Glyphis, Reptilia, Teleostei",
    author = "Bree Tillett and Meekan, {Mark G} and Iain Field",
    year = "2014",
    month = "10",
    day = "17",
    doi = "10.3354/esr00615",
    language = "English",
    volume = "25",
    pages = "283--293",
    journal = "Endangered Species Research",
    issn = "1613-4796",
    publisher = "Inter-Research",
    number = "3",

    }

    Dietary overlap and partitioning among three sympatric carcharhinid sharks. / Tillett, Bree; Meekan, Mark G; Field, Iain.

    In: Endangered Species Research, Vol. 25, No. 3, 17.10.2014, p. 283-293.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Dietary overlap and partitioning among three sympatric carcharhinid sharks

    AU - Tillett, Bree

    AU - Meekan, Mark G

    AU - Field, Iain

    PY - 2014/10/17

    Y1 - 2014/10/17

    N2 - 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.

    AB - 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.

    KW - coexistence

    KW - dietary overlap

    KW - food web

    KW - isotopic analysis

    KW - niche partitioning

    KW - shark

    KW - stable isotope

    KW - stomach content

    KW - trophic conditions

    KW - trophic structure

    KW - Carcharhinidae

    KW - Carcharhinus

    KW - Carcharhinus amboinensis

    KW - Carcharhinus leucas

    KW - Cephalopoda

    KW - Chondrichthyes

    KW - Crustacea

    KW - Glyphis

    KW - Reptilia

    KW - Teleostei

    U2 - 10.3354/esr00615

    DO - 10.3354/esr00615

    M3 - Article

    VL - 25

    SP - 283

    EP - 293

    JO - Endangered Species Research

    JF - Endangered Species Research

    SN - 1613-4796

    IS - 3

    ER -