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Parasite–induced reduction in host survival and fecundity: the effect of the nematode Elaphostrongylus rangiferi on the snail intermediate host

Published online by Cambridge University Press:  06 April 2009

Arne Skorping
Arne Skorping
Affiliation:
Department of Ecology, University of Tromsø, P.O. Box 3085, Guleng, N-9001 Tromsø, Norway
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Summary

The effect of the protostrongylid nematode, Elaphostrongylus rangiferi, on the fecundity and survival of an intermediate snail host, Arianta arbustorum, was studied. Over an experimental period of 12 weeks, infected snails had a significantly lower egg production than uninfected control snails. No significant difference in survival was found between infected and uninfected adult snails. Infected juvenile snails showed a consistent decrease in survival with increasing mean density of parasites. A linear relationship was found between snail instantaneous death rate over a 28–day interval and the mean number of parasites/snail. When calculated for 4–day intervals, the instantaneous death rate was highest between 8 and 12 days post–infection. It is concluded that the most pathogenic phase of this parasite is during the first moult.

Type
Research Article
Information
Parasitology , Volume 91 , Issue 3 , December 1985 , pp. 555 - 562
Copyright
Copyright © Cambridge University Press 1985

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References

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