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Density-dependent effects of Anguillicola crassus (Nematoda) within and on its copepod intermediate hosts

Published online by Cambridge University Press:  06 April 2009

S. T. Ashworth*
Affiliation:
Department of Biological Sciences, University of Exeter, Prince of Wales Road, Exeter EX4 4PS, UK
C. R. Kennedy
Affiliation:
Department of Biological Sciences, University of Exeter, Prince of Wales Road, Exeter EX4 4PS, UK
G. Blanc
Affiliation:
Ministère de l'Agriculture et de la Pêche, Ecole Nationale Vétérinaire de Nantes, C.P. 3013, 44087 Nantes, Cedex 03, France
*
* Corresponding author. Tel: 01392 263263. Fax: 01392 263700. E-mail: [email protected].

Summary

Density-dependent effects of Anguillicola crassus larval infections in the copepod intermediate host were examined experimentally. Three species of copepods (Cyclops vicinus, C. viridis and C. fuscus) were subjected to a range of doses of larval A. crassus within infection arenas. Prevalence, intensity and parasite dispersion (variance: mean abundance) values increase and then approach an asymptote as infection dose increases. Infection parameters differ between species of copepod. Increasing temperature has a negative effect on the establishment of the parasite population within the intermediate host. Parasite-induced host mortality increases with dose. These mechanisms have the potential to regulate populations of A. crassus larvae within the copepod population and hence the whole suprapopulation.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1996

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