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Competitive Exclusion between Two Intestinal Parasites of the Three-Spined Stickleback, Gasterosteus aculeatus L.

L. H. Chappell
The Journal of Parasitology
Vol. 55, No. 4 (Aug., 1969), pp. 775-778
DOI: 10.2307/3277217
Stable URL: http://www.jstor.org/stable/3277217
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.
Competitive Exclusion between Two Intestinal Parasites of the Three-Spined Stickleback, Gasterosteus aculeatus L.
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Abstract

When the cestode Proteocephalus filicollis occurred concurrently with the acanthocephalan Neoechinorhynchus rutili, in natural infections of the three-spined stickleback, the distribution of each species in the gut was significantly different from when these species occurred alone. In concurrent infections partial spatial separation of the two species was observed in which both adults and plerocercoids of P. filicollis attached more frequently in the anterior intestine while individuals of N. rutili attached more frequently in the rectum. In single species infections individuals of both species were distributed more widely throughout the gut. The data are thought to exemplify competitive exclusion and are possibly the result of the adverse effect of each species on the environment of the other.

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