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Food Habits of Allotopic and Syntopic Populations of the Topminnows Fundulus olivaceus and Fundulus notatus
Jamie E. Thomerson and David P. Wooldridge
The American Midland Naturalist
Vol. 84, No. 2 (Oct., 1970), pp. 573-576
Published by: The University of Notre Dame
Stable URL: http://www.jstor.org/stable/2423875
Page Count: 4
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Qualitative analysis of gut contents of Fundulus olivaceus and F. notatus from Upper Mississippi Valley allotopic and syntopic populations indicates similar food habits for all populations. Major food items in order of importance are: terrestrial arthropods, aquatic insects, filamentous algae. Syntopic F. olivaceus females, significantly, have the emptiest guts, suggesting that food competition from F. notatus lowers the energy available to them for yolking eggs. Mosaic distribution, rareness of syntopy, and prevalence of F. notatus in syntopic populations is attributed to competitive exclusion between species with similar food niches.
The American Midland Naturalist © 1970 The University of Notre Dame