Abstract
Food habit comparisons between two sibling species of minnows, the large-scale stoneroller Campostoma oligolepis and the central stoneroller C. anomalum pullum, suggest a microhabitat separation in syntopic populations in SW Missouri. The measurable food habit differences between species with respect to inorganic matter and species composition of diatoms consumed indicated that C. a. pullum feeds in slower flowing sections of the riffle habitat than C. oligolepis. Both species showed selection of nonmotile over motile diatoms. Young-of-the-year stonerollers (species combined) had a mean consumption rate of 0.0144 ml/g body wt/hr during daylight with maximum intestinal volume occurring at dusk. Daily ration, measured in September, was 27 % of body weight and was completely digested overnight.
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