Using fine-scale overlap in predator-prey distribution to assess avian predation risk to a reservoir population of threatened Macquarie Perch

Katie Ryan, Mark LINTERMANS, Brendan Ebner, Richard Norris

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Investigations of predator–prey dynamics have largely focused on quantifying predation rates, yet achieving an appropriate sample to quantify predation is difficult when prey populations are small and individuals are rare. Moreover, quantifying rates of predation does not necessarily provide solutions for protecting threatened populations from predation. We used predator abundance and fine-scale predator–prey spatial overlap to identify trends in predation risk from cormorants, Phalacrocorax, to adults of the endangered Macquarie Perch, Macquaria australasica, in Cotter Reservoir, Australia. We made observations of cormorants at Cotter Reservoir between February 2008 and July 2009 to estimate abundance and spatial distribution. We used radiotelemetry to locate adult Macquarie Perch. Cormorant abundance was highest in spring and summer. Increased cormorant abundance corresponded with an increase in the fine-scale overlap of the distributions of Macquarie Perch and cormorant within the reservoir. Overlap was highest in the upstream section of the reservoir, which is characterized by shallow water (,5 m depth). Increased overlap corresponded with congregation of Macquarie Perch in the upper reservoir and movement toward the source river for spawning. Our results provide valuable insight into when and where predation is most likely to occur, thereby allowing conservation efforts to be tailored to protect this threatened fish population effectively.
    Original languageEnglish
    Pages (from-to)1057-1072
    Number of pages16
    JournalFreshwater Science
    Volume32
    Issue number4
    DOIs
    Publication statusPublished - 2013

    Fingerprint

    Macquaria australasica
    Phalacrocorax
    predation risk
    predation
    predator
    predators
    radiotelemetry
    radio telemetry
    spawning
    shallow water
    distribution
    spatial distribution
    summer
    fish
    rivers
    river

    Cite this

    @article{27629d71a9bf49d29f85464f2c989199,
    title = "Using fine-scale overlap in predator-prey distribution to assess avian predation risk to a reservoir population of threatened Macquarie Perch",
    abstract = "Investigations of predator–prey dynamics have largely focused on quantifying predation rates, yet achieving an appropriate sample to quantify predation is difficult when prey populations are small and individuals are rare. Moreover, quantifying rates of predation does not necessarily provide solutions for protecting threatened populations from predation. We used predator abundance and fine-scale predator–prey spatial overlap to identify trends in predation risk from cormorants, Phalacrocorax, to adults of the endangered Macquarie Perch, Macquaria australasica, in Cotter Reservoir, Australia. We made observations of cormorants at Cotter Reservoir between February 2008 and July 2009 to estimate abundance and spatial distribution. We used radiotelemetry to locate adult Macquarie Perch. Cormorant abundance was highest in spring and summer. Increased cormorant abundance corresponded with an increase in the fine-scale overlap of the distributions of Macquarie Perch and cormorant within the reservoir. Overlap was highest in the upstream section of the reservoir, which is characterized by shallow water (,5 m depth). Increased overlap corresponded with congregation of Macquarie Perch in the upper reservoir and movement toward the source river for spawning. Our results provide valuable insight into when and where predation is most likely to occur, thereby allowing conservation efforts to be tailored to protect this threatened fish population effectively.",
    keywords = "Macquarie Perch, cormorants, predator abundance, predator–prey overlap, predation risk, threatened species.",
    author = "Katie Ryan and Mark LINTERMANS and Brendan Ebner and Richard Norris",
    year = "2013",
    doi = "10.1899/12-059.1",
    language = "English",
    volume = "32",
    pages = "1057--1072",
    journal = "Journal of the North American Benthological Society",
    issn = "2161-9565",
    publisher = "The Society for Freshwater Science",
    number = "4",

    }

    Using fine-scale overlap in predator-prey distribution to assess avian predation risk to a reservoir population of threatened Macquarie Perch. / Ryan, Katie; LINTERMANS, Mark; Ebner, Brendan; Norris, Richard.

    In: Freshwater Science, Vol. 32, No. 4, 2013, p. 1057-1072.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Using fine-scale overlap in predator-prey distribution to assess avian predation risk to a reservoir population of threatened Macquarie Perch

    AU - Ryan, Katie

    AU - LINTERMANS, Mark

    AU - Ebner, Brendan

    AU - Norris, Richard

    PY - 2013

    Y1 - 2013

    N2 - Investigations of predator–prey dynamics have largely focused on quantifying predation rates, yet achieving an appropriate sample to quantify predation is difficult when prey populations are small and individuals are rare. Moreover, quantifying rates of predation does not necessarily provide solutions for protecting threatened populations from predation. We used predator abundance and fine-scale predator–prey spatial overlap to identify trends in predation risk from cormorants, Phalacrocorax, to adults of the endangered Macquarie Perch, Macquaria australasica, in Cotter Reservoir, Australia. We made observations of cormorants at Cotter Reservoir between February 2008 and July 2009 to estimate abundance and spatial distribution. We used radiotelemetry to locate adult Macquarie Perch. Cormorant abundance was highest in spring and summer. Increased cormorant abundance corresponded with an increase in the fine-scale overlap of the distributions of Macquarie Perch and cormorant within the reservoir. Overlap was highest in the upstream section of the reservoir, which is characterized by shallow water (,5 m depth). Increased overlap corresponded with congregation of Macquarie Perch in the upper reservoir and movement toward the source river for spawning. Our results provide valuable insight into when and where predation is most likely to occur, thereby allowing conservation efforts to be tailored to protect this threatened fish population effectively.

    AB - Investigations of predator–prey dynamics have largely focused on quantifying predation rates, yet achieving an appropriate sample to quantify predation is difficult when prey populations are small and individuals are rare. Moreover, quantifying rates of predation does not necessarily provide solutions for protecting threatened populations from predation. We used predator abundance and fine-scale predator–prey spatial overlap to identify trends in predation risk from cormorants, Phalacrocorax, to adults of the endangered Macquarie Perch, Macquaria australasica, in Cotter Reservoir, Australia. We made observations of cormorants at Cotter Reservoir between February 2008 and July 2009 to estimate abundance and spatial distribution. We used radiotelemetry to locate adult Macquarie Perch. Cormorant abundance was highest in spring and summer. Increased cormorant abundance corresponded with an increase in the fine-scale overlap of the distributions of Macquarie Perch and cormorant within the reservoir. Overlap was highest in the upstream section of the reservoir, which is characterized by shallow water (,5 m depth). Increased overlap corresponded with congregation of Macquarie Perch in the upper reservoir and movement toward the source river for spawning. Our results provide valuable insight into when and where predation is most likely to occur, thereby allowing conservation efforts to be tailored to protect this threatened fish population effectively.

    KW - Macquarie Perch

    KW - cormorants

    KW - predator abundance

    KW - predator–prey overlap

    KW - predation risk

    KW - threatened species.

    U2 - 10.1899/12-059.1

    DO - 10.1899/12-059.1

    M3 - Article

    VL - 32

    SP - 1057

    EP - 1072

    JO - Journal of the North American Benthological Society

    JF - Journal of the North American Benthological Society

    SN - 2161-9565

    IS - 4

    ER -