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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
DOI: 10.2307/2423875
Stable URL: http://www.jstor.org/stable/2423875
Page Count: 4
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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 of Allotopic and Syntopic Populations of the Topminnows Fundulus olivaceus and Fundulus notatus
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Abstract

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.

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