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The influence of second intermediate host dispersion pattern upon the transmission of cercariae of Echinoparyphium recurvatum (Digenea: Echinostomatidae)

Published online by Cambridge University Press:  06 April 2009

A. M. McCarthy
A. M. McCarthy
Affiliation:
Division of Biosphere Sciences, King's College London, University of London, Kensington, London W8 7AH
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Summary

Transmission of cercariae of the echinostome digenean Echinoparyphium recurvatum was observed in experimental populations of the second intermediate host snail Lymnaea peregra. Populations of 100 snails were distributed among plastic mesh cages in an infection arena to produce different patterns of host dispersion. Cercarial transmission was investigated in host populations showing three separate patterns of host dispersion; Ideal Regular, Random and Contagious (‘Clumped’). Levels of cercarial transmission in populations showing each type of dispersion pattern were found to be significantly different. The highest rate of cercarial transmission occurred in the contagiously dispersed host population, and the lowest in the randomly dispersed population. Analysis of results from the randomly dispersed population also showed that both the mean percentage prevalence of infection, and also the mean number of cysts recovered per snail, increased significantly with the number of snails per cage. The positive relationship between the mean number of cysts per snail and the number of snails per cage was found to be best described by an exponential function. Chemosensory location of L. peregra snail hosts by E. recurvatum cercariae may provide an explanation for the patterns of cercarial transmission observed.

Keywords

echinostomeEchinoparyphium recurvatumcercarial transmissionhost dispersion patternssecond intermediate hostsLymnaea peregra
Type
Research Article
Information
Parasitology , Volume 101 , Issue 1 , August 1990 , pp. 43 - 47
Copyright
Copyright © Cambridge University Press 1990

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