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Food Habits and Feeding Periodicity in Two Sympatric Stonerollers (Cyprinidae)

James F. Fowler and Charles A. Taber
The American Midland Naturalist
Vol. 113, No. 2 (Apr., 1985), pp. 217-224
DOI: 10.2307/2425567
Stable URL: http://www.jstor.org/stable/2425567
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Food Habits and Feeding Periodicity in Two Sympatric Stonerollers (Cyprinidae)
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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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