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Transmission, infectivity and survival of Diplostomum spathaceum cercariae

Published online by Cambridge University Press:  09 October 2003

A. KARVONEN ,
S. PAUKKU ,
E. T. VALTONEN  and
P. J. HUDSON
A. KARVONEN
Affiliation:
Department of Biological and Environmental Science, P.O. Box 35, 40014, University of Jyväskylä, Finland
S. PAUKKU
Affiliation:
Department of Biological and Environmental Science, P.O. Box 35, 40014, University of Jyväskylä, Finland
E. T. VALTONEN
Affiliation:
Department of Biological and Environmental Science, P.O. Box 35, 40014, University of Jyväskylä, Finland
P. J. HUDSON
Affiliation:
Biology Department, Penn State University, 208 Mueller Lab, University Park, Philadelphia 16802, USA Department of Biological Sciences, University of Stirling, Stirling FK9 4LA, Scotland
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Abstract

The transmission dynamics of the cercariae of Diplostomum spathaceum were investigated under laboratory conditions using cercariae collected from naturally infected Lymnaea stagnalis. Cercariae were kept in a constant temperature of 20 °C and the survival and infectivity to naïve young rainbow trout recorded at 3-h intervals until few cercariae were alive. Mortality initially remained constant but increased rapidly after 20 h. While a model of constant mortality fitted the survival data, an age-dependent model provided a better fit and implied that cercariae tended to carry similar quantities of resources and once these were exhausted the cercariae died. Cercarial infectivity also showed an age-dependent pattern although infectivity tended (P=0·09) to increase with age over the first 6 h of life and then fall. The per capita transmission rate of cercariae was investigated by experimentally infecting rainbow trout under standardized conditions, first with an increasing cercarial density and second, by keeping density constant but increasing numbers of cercariae. The per capita transmission rate was frequency dependent and averaged 0·341/h (±0·036).

Keywords

transmission coefficientfrequency dependenceDiplostomum spathaceumcercariaesurvivalinfectivity
Type
Research Article
Information
Parasitology , Volume 127 , Issue 3 , September 2003 , pp. 217 - 224
Copyright
© 2003 Cambridge University Press

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