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Effects of temperature and host density on the snail-finding capacity of cercariae of Echinostoma caproni (Digenea: Echinostomatidae)

Published online by Cambridge University Press:  06 April 2009

D. Meyrowitsch ,
N. Ø. Christensen  and
O. Hindsbo
D. Meyrowitsch
Affiliation:
Danish Bilharziasis Laboratory, Jaegersborg Alle 1D, DK-2920 Charlottenlund, Denmark
N. Ø. Christensen
Affiliation:
Danish Bilharziasis Laboratory, Jaegersborg Alle 1D, DK-2920 Charlottenlund, Denmark
O. Hindsbo
Affiliation:
Institute of Population Biology, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen Ø, Denmark
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Extract

The effect of temperature (19–36 °C) and snail host density (0.014–10 snails/1) on the snail-finding capacity of Echinostoma caproni cercariae is described. The initial swimming speed increased whereas the length of the infective period decreased with increasing temperature. The combined effect resulted in the E. caproni cercarial snail-finding capacity being temperature independent in the range 19 to 36 °C at a snail density of 0·014 snails/1. A moderate temperature dependency was, however, seen at a lower snail density. The cercarial snail-finding capacity was snail-host density dependent in the density range 0.014 to 1 snail/1. The findings from this study show that a relatively low and biologically realistic snail host density must be used in experimental studies if realistic estimates of the dynamics of cercarial transmission are to be obtained.

Keywords

Echinostoma caproniBiomphalaria glabratacercarial snail findingwater volumetemperature
Type
Research Article
Information
Parasitology , Volume 102 , Issue 3 , June 1991 , pp. 391 - 395
Copyright
Copyright © Cambridge University Press 1991

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