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    Author(s): C. C. McGrath; W. M. Lewis
    Date: 2007
    Source: Transactions of the American Fisheries Society. 136: 1381-1392.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (425 B)

    Description

    Cutthroat trout Oncorhynchus clarkii frequently are displaced by nonnative brook trout Salvelinus fontinalis, but the ecological mechanisms of displacement are not understood. Competition for food and predation between greenback cutthroat trout O. c. stomias and brook trout were investigated in montane streams of Colorado. A replicated field study was used to describe the population density, diet, stomach fullness, and body condition of the two species in allopatry and sympatry. Population data confirmed that brook trout displaced greenback cutthroat trout at sites where the species occur together. The diets of the two species were different; cutthroat trout consumed more prey items and a wider variety of prey than brook trout. Sympatry did not influence gut fullness or body condition for either species. Predation occurred at low rates that did not account for declines in populations of greenback cutthroat trout. Instead, population data suggest that the displacement of greenback cutthroat trout by brook trout occurs through a bottleneck on recruitment due to the mortality of eggs or juvenile cutthroat trout.

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    Citation

    McGrath, C. C.; Lewis, W. M., Jr. 2007. Competition and predation as mechanisms for displacement of greenback cutthroat trout by brook trout. Transactions of the American Fisheries Society. 136: 1381-1392.

    Keywords

    cutthroat trout, Oncorhynchus clarkii, nonnative brook trout, Salvelinus fontinalis, competition, predation

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