Ontogenetic changes and intraspecific resource partitioning in the tahoe sucker, Catostomus tahoensis
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- Marrin, D.L. Environ Biol Fish (1983) 8: 39. doi:10.1007/BF00004944
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Intraspecific resource partitioning among three size classes of tahoe sucker was investigated in a small subalpine lake in California. Distribution of fish was determined by underwater observation, and stomach content analysis provided information on dietary patterns. Juvenile fish were restricted to shallow or weedy areas of the lake, while adult sucker occupied a variety of habitats and exhibited a diel migration from deep water by day to near shore at night. All size classes displayed some schooling during the day, but fed solitarily in the littoral benthic regions at night. Ontogenetic changes in food habits were a result of adult fish foraging in a greater number of habitats and feeding on different prey types than juveniles. Temporal partitioning appeared to be less important than either trophic or habitat partitioning.