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Availability of caecal habitat as a density-dependent limit on survivorship of Leptorhynchoides thecatus in green sunfish, Lepomis cyanellus

Published online by Cambridge University Press:  06 April 2009

Julie A. Ewald  and
B. B. Nickol
Julie A. Ewald
Affiliation:
School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0118 USA
B. B. Nickol
Affiliation:
School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0118 USA
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Summary

Distribution of Leptorhynchoides thecatus (Acanthocephala: Rhadinorhynchidae) among the pyloric caeca and the relationship between site and rate of maturation were studied in laboratory infectons of 10, 25 and 40 cystacanths fed to green sunfish, Lepomis cyanellus. After 1 week fish fed at each intensity had significantly different numbers of worms. By the 3rd week post-infection, parasites disappeared from the anterior portion of the intestine. At this time the mean numbers of worms recovered from 25 and 40-cystacanth infections were not significantly different. At the end of the 1st week, the area where caeca join the alimentary tract (between caecal area) and caeca numbered 6 and 7 contained significantly more worms than the other sites. By the 3rd week post-infection only caecum 7 contained significantly more worms, and at 5 weeks there was no significant difference between the number of worms present in any caecum or the between caecal area. Initially worms in the more intense infections matured more slowly, but by the 3rd week post-infection there was no significant difference in the states of maturity. The rate of maturation was not related to the site occupied.

Keywords

Leptorhynchoides thecatussurvivorshipcaecal habitatgreen sunfishLepomis cyanellus
Type
Research Article
Information
Parasitology , Volume 98 , Issue 3 , June 1989 , pp. 447 - 450
Copyright
Copyright © Cambridge University Press 1989

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References

REFERENCES

Brown, A. F. (1986). Evidence for density-dependent establishment and survival of Pomphorhynchus laevis (Muller, 1776) (Acanthocephala) in laboratory-infected Salmo gairdneri Richardson and its bearing on wild populations in Leuciscus cephalas (L.). Journal of Fish Biology 28, 659–69.CrossRefGoogle Scholar
Crompton, D. W. T. (1970). An Ecological Approach to Acanthocephalan Physiology. Cambridge: Cambridge University Press.Google Scholar
Kennedy, C. R., Broughton, P. F. & Hine, P. M. (1976). The sites occupied by the acanthocephalan Pomphorhynchus laevis in the alimentary canal of fish. Parasitology 72, 195–206.CrossRefGoogle ScholarPubMed
Lackie, A. M. (1974). The activation of cystacanths of Polymorphus minutus (Acanthocephala) in vitro. Parasitology 68, 135–46.CrossRefGoogle ScholarPubMed
Samuel, N., Nickol, B. B. & Mayes, M. A. (1976). Acanthocephala of Nebraska fishes. American Midland Naturalist 96, 391–406.CrossRefGoogle Scholar
Uglem, G. L. & Beck, S. M. (1972). Habitat specificity and correlated aminopeptidase activity in the acanthocephalans Neoechinorhynchus cristatus and N. crassus. Journal of Parasitology 58, 911–20.CrossRefGoogle Scholar
Uznanski, R. L. & Nickol, B. B. (1982). Site selection, growth, and survival of Leptorhynchoides thecatus (Acanthocephala) during the prepatent period in Lepomis cyanellus. Journal of Parasitology 68, 686–90.CrossRefGoogle Scholar
Williams, H. H., Colin, J. A, & Halvorsen, O. (1987). Biology of gyrocotylideans with emphasis on reproduction, population ecology and phylogeny. Parasitology 95, 173–207.CrossRefGoogle Scholar
Williams, J. A. & Nickol, B. B. (1989). Histological structure of the intestine and pyloric ceca of the green sunfish Lepomis cyanellus Rafinesque. Journal of Fish Biology 34 (in the Press).Google Scholar