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Hilderbrand, R. H., and J. L. Kershner. 2004b. Influence of habitat type on food supply, selectivity, and diet overlap of Bonneville cutthroat trout and nonnative brook trout in Beaver Creek, Idaho. North American Journal of Fisheries Management 24:33-40. In a Nutshell: Problem - Native cutthroat trout and nonnative brook trout may compete for limiting food resources in streams and result in the spatial segregation or elimination of the native fish. What - We compared diets and food availability to assess the potential for interspecific competition across three general stream habitat types. Findings - Although there was high diet overlap between trout species, food was not limiting during the study period. Food supply and consumption varied substantially across different stream habitat types despite their close proximity. Potential Applications - Spatial variation in food supply and diet overlap may help to explain why cutthroat trout are eliminated from some habitats in systems where food is limiting and may help managers to identify problem areas for control of nonnatives. |
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