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    Apparent competition or apparent mutualism? shared predation when populations cycle

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    Abrams_1998.pdf (143.3Kb)
    Issue Date
    1998
    Author
    Abrams, Peter A.
    Holt, Robert D.
    Roth, James D.
    Publisher
    The Ecological Society of America
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    Copyright by the Ecological Society of America
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    Abstract
    We use simple mathematical models to explore the indirect interactions between two prey species that share a predator when all three species undergo population cycles. The results are compared to analogous findings for systems that reach a stable equilibrium point. It is common for removal of one prey from a cycling system to result in a decrease in the mean density of the remaining prey species, contrary to the usual logic of apparent competition. Even when apparent competition between prey exists, its magnitude is usually reduced by population cycles. This effect occurs when the predator has a concavedown relationship between prey abundance and its own per capita growth rate. Such relationships can occur because of a saturating functional or numerical response. We investigate how prey density dependence and the shape of the predator’s functional and numerical responses affect the sign and magnitude of this indirect interaction between prey species. There may also be (1, 2) interactions between prey that differ significantly in their susceptibility to the common predator.
    URI
    http://hdl.handle.net/1808/16584
    DOI
    https://doi.org/10.1890/0012-9658
    Collections
    • Ecology & Evolutionary Biology Scholarly Works [1516]
    Citation
    Abrams, P. A., Holt, R. D., & Roth, J. D. (1998). Apparent competition or apparent mutualism? shared predation when populations cycle. Ecology, 79(1), 201–212. http://dx.doi.org/10.1890/0012-9658

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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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