A possible false negative: Lack of evidence for trout predation on a remnant population of the endangered Macquarie perch, Macquaria australasica, in Cotter Reservoir, Australia

B. Ebner, B. Broadhurst, M. Lintermans, M. Jekabsons

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    To investigate possible predation on a remnant population of the endangered Macquaria australasica in Cotter Reservoir, ACT, Australia, stomach content analysis was conducted on 63 rainbow trout Oncorhynchus mykiss and 24 brown trout Salmo trutta. Both predators were found to be piscivorous, with the frequency of piscivory generally increasing with body size. Goldfish Carassius auratus were the only fish species identified in stomach contents. That gape-limitan on prevented trout from feeding on juvenile M. australasica was eliminated as a possibility based on: (1) the body depth of prey and the mouth-size of predators; and (2) evidence that another species of similar dimensions was ingested by trout. Whether or not trout predation on M. australasica is an important process in Cotter Reservoir remains to be clarified. Juvenile M. austalasica do not reside in the parts of the reservoir from which most trout were actually sampled in the current study. Therefore, it is proposed that the lack of evidence for predation on M. australasica is potentially a false-negative result. © 2007, Copyright Taylor & Francis Group, LLC.
    Original languageEnglish
    Pages (from-to)231-237
    Number of pages7
    JournalNew Zealand Journal of Marine and Freshwater Research
    Volume41
    Issue number2
    DOIs
    Publication statusPublished - 2007

    Fingerprint

    Macquaria australasica
    trout
    predation
    stomach content
    Salmo trutta
    predator
    piscivory
    Oncorhynchus mykiss
    stomach
    predators
    rainbow
    Carassius auratus
    goldfish
    body size
    mouth
    fish

    Cite this

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    title = "A possible false negative: Lack of evidence for trout predation on a remnant population of the endangered Macquarie perch, Macquaria australasica, in Cotter Reservoir, Australia",
    abstract = "To investigate possible predation on a remnant population of the endangered Macquaria australasica in Cotter Reservoir, ACT, Australia, stomach content analysis was conducted on 63 rainbow trout Oncorhynchus mykiss and 24 brown trout Salmo trutta. Both predators were found to be piscivorous, with the frequency of piscivory generally increasing with body size. Goldfish Carassius auratus were the only fish species identified in stomach contents. That gape-limitan on prevented trout from feeding on juvenile M. australasica was eliminated as a possibility based on: (1) the body depth of prey and the mouth-size of predators; and (2) evidence that another species of similar dimensions was ingested by trout. Whether or not trout predation on M. australasica is an important process in Cotter Reservoir remains to be clarified. Juvenile M. austalasica do not reside in the parts of the reservoir from which most trout were actually sampled in the current study. Therefore, it is proposed that the lack of evidence for predation on M. australasica is potentially a false-negative result. {\circledC} 2007, Copyright Taylor & Francis Group, LLC.",
    author = "B. Ebner and B. Broadhurst and M. Lintermans and M. Jekabsons",
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    T1 - A possible false negative: Lack of evidence for trout predation on a remnant population of the endangered Macquarie perch, Macquaria australasica, in Cotter Reservoir, Australia

    AU - Ebner, B.

    AU - Broadhurst, B.

    AU - Lintermans, M.

    AU - Jekabsons, M.

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    N2 - To investigate possible predation on a remnant population of the endangered Macquaria australasica in Cotter Reservoir, ACT, Australia, stomach content analysis was conducted on 63 rainbow trout Oncorhynchus mykiss and 24 brown trout Salmo trutta. Both predators were found to be piscivorous, with the frequency of piscivory generally increasing with body size. Goldfish Carassius auratus were the only fish species identified in stomach contents. That gape-limitan on prevented trout from feeding on juvenile M. australasica was eliminated as a possibility based on: (1) the body depth of prey and the mouth-size of predators; and (2) evidence that another species of similar dimensions was ingested by trout. Whether or not trout predation on M. australasica is an important process in Cotter Reservoir remains to be clarified. Juvenile M. austalasica do not reside in the parts of the reservoir from which most trout were actually sampled in the current study. Therefore, it is proposed that the lack of evidence for predation on M. australasica is potentially a false-negative result. © 2007, Copyright Taylor & Francis Group, LLC.

    AB - To investigate possible predation on a remnant population of the endangered Macquaria australasica in Cotter Reservoir, ACT, Australia, stomach content analysis was conducted on 63 rainbow trout Oncorhynchus mykiss and 24 brown trout Salmo trutta. Both predators were found to be piscivorous, with the frequency of piscivory generally increasing with body size. Goldfish Carassius auratus were the only fish species identified in stomach contents. That gape-limitan on prevented trout from feeding on juvenile M. australasica was eliminated as a possibility based on: (1) the body depth of prey and the mouth-size of predators; and (2) evidence that another species of similar dimensions was ingested by trout. Whether or not trout predation on M. australasica is an important process in Cotter Reservoir remains to be clarified. Juvenile M. austalasica do not reside in the parts of the reservoir from which most trout were actually sampled in the current study. Therefore, it is proposed that the lack of evidence for predation on M. australasica is potentially a false-negative result. © 2007, Copyright Taylor & Francis Group, LLC.

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