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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
Stable URL: http://www.jstor.org/stable/3277217
Page Count: 4
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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.
The Journal of Parasitology © 1969 The American Society of Parasitologists