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Parasite-altered behaviour: impact of infection and starvation on mating in Biomphalaria glabrata

Published online by Cambridge University Press:  06 April 2009

J. C. Rupp
J. C. Rupp
Affiliation:
Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS
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Summary

Very little is known about parasite-altered mating behaviour. This paper describes two experiments on the impact of infection and starvation on mating in Biomphalaria glabrata snails. In the first experiment, snails were infected with the parasitic trematode Schistosoma mansoni. During both the early and the late stages of infection, snails were allowed to mate with individuals of the same infection status and uninfected controls. Their mating activities were filmed and later analysed. The mating frequencies of patently infected (shedding) snails were found to be lower than those of controls. This is thought to result from stress induced by the pathology. Successfully infected snails were found to mate more often as males than as females. This is seen as a compensation for the reduced fecundity caused by trematode infection. Successfully infected snails also exhibited partner choice. More matings were found between snails of the opposite infection status than among snails of the same infection status. This may be explained by the good genes hypothesis and can be seen as a specific response to schistosome infection. In the second experiment, starved snails were allowed to mate with starved and control snails. They mated less often than controls and more often as males than as females, controls showing the opposite pattern. This may be considered to be a general stress response. No partner choice has been found with starved snails. It is suggested that partner choice in infected snails occurs in response to specific rather than general stress.

Keywords

snailsSchistosoma mansonimatechoice
Type
Research Article
Information
Parasitology , Volume 113 , Issue 4 , October 1996 , pp. 357 - 365
Copyright
Copyright © Cambridge University Press 1996

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