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    Apparent Size as the Determinant of Prey Selection by Bluegill Sunfish (Lepomis Macrochirus)

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    Issue Date
    1976-11-01
    Author
    O'Brien, W. John
    Slade, Norman A.
    Vinyard, Gary L.
    Publisher
    Ecological Society of America
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    Although it is known that visual predation by planktivorous fish tends to be size selective, the mechanism by which fish select their prey has not previously been described. Experiments in which bluegill sunfish (Lepomis macrochirus) were given a binary choice between prey of different sizes presented at different distances showed the fish selected the prey that appeared largest, either because of its actual size or its proximity to the fish. This paper incorporates this mechanism of prey selection by apparent size into a model of bluegill predation. According to the model, bluegill, in choosing the apparently largest prey under all conditions, alter their diet composition depending upon the abundance of prey. When prey are abundant, bluegill predominantly select prey of the largest size class available because these have the greatest probability of appearing largest; as large prey become scarce and smaller prey have a greater chance of appearing large, the fish tend to eat more prey from smaller size classes. When the model is tested against data from published fish-feeding experiments, the predicted size ratios of prey eaten correlate accurately with the observed ratios and numbers of prey eaten.
    Description
    Copyright by the Ecological Society of America. This is the publisher's version, also available electronically from http://www.jstor.org/stable/1935055.
    URI
    http://hdl.handle.net/1808/17983
    DOI
    https://doi.org/10.2307/1935055
    Collections
    • Ecology & Evolutionary Biology Scholarly Works [1493]
    Citation
    O'Brien, W. John; Slade, Norman A.; Vinyard, Gary L. (1976). "Apparent Size as the Determinant of Prey Selection by Bluegill Sunfish (Lepomis Macrochirus)." Ecology, 57(6):1304-1310. http://dx.doi.org/10.2307/1935055.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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