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  • Effects of sample size on numerical estimates of diel prey consumption in a fish population

    Author(s)
    Ebner, B.
    McAllister, Ryan R. J.
    Suter, Phil
    Griffith University Author(s)
    Ebner, Brendan C.
    Year published
    2009
    Metadata
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    Abstract
    Numerical data based on stomach content analysis of the zooplanktivorous freshwater fish, Retropinna semoni, were used to examine the effect of fish sample size on mean counts of dominant prey items. Fifty adult R. semoni were collected from throughout the open-water of Lake Benanee, Australia at each of five times over a diel period. Bootstrapping was used to generate confidence intervals around sample means, and markedly more accurate means were obtained from samples collected in the day than the night. High variation in night samples was the by-product of a diurnal feeding regime. Traditional sample sizes of 10 to 15 ...
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    Numerical data based on stomach content analysis of the zooplanktivorous freshwater fish, Retropinna semoni, were used to examine the effect of fish sample size on mean counts of dominant prey items. Fifty adult R. semoni were collected from throughout the open-water of Lake Benanee, Australia at each of five times over a diel period. Bootstrapping was used to generate confidence intervals around sample means, and markedly more accurate means were obtained from samples collected in the day than the night. High variation in night samples was the by-product of a diurnal feeding regime. Traditional sample sizes of 10 to 15 stomachs resulted in reasonable confidence intervals of sample means derived from collections on the first day, corresponding to uniform feeding patterns in the population. However, increased sample sizes were required to describe more complex feeding behaviour on the second day, when a proportion of the population switched to an alternative prey source.
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    Journal Title
    New Zealand Journal of Marine and Freshwater Research
    Volume
    43
    Publisher URI
    http://royalsociety.org.nz/
    DOI
    https://doi.org/10.1080/00288330909510024
    Subject
    Freshwater Ecology
    Earth Sciences
    Environmental Sciences
    Biological Sciences
    Publication URI
    http://hdl.handle.net/10072/26425
    Collection
    • Journal articles

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