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Behaviours in trematode cercariae that enhance parasite transmission: patterns and processes

Published online by Cambridge University Press:  07 April 2017

C. Combes ,
A. Fournier ,
H. Moné  and
A. Théron
C. Combes
Affiliation:
Laboratoire de Biologie Animate (URA CNRS 698), Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Université, Avenue de Villeneuve, 66860 Perpignan Cedex, France
A. Fournier
Affiliation:
Laboratoire de Biologie Animate (URA CNRS 698), Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Université, Avenue de Villeneuve, 66860 Perpignan Cedex, France
H. Moné
Affiliation:
Laboratoire de Biologie Animate (URA CNRS 698), Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Université, Avenue de Villeneuve, 66860 Perpignan Cedex, France
A. Théron
Affiliation:
Laboratoire de Biologie Animate (URA CNRS 698), Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Université, Avenue de Villeneuve, 66860 Perpignan Cedex, France
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Extract

Cercariae, like miracidia, are non-parasitic larval stages implicated in the life cycle of all trematodes for the host-to-host parasite transmission. Almost all cercariae are free-living in the external environment. With a few exceptions (cercariae of Halipegus occidualis (Halipegidae) can live several months, Shostak & Esch, 1990a), cercariae have a short active life during which they do not feed, living on accumulated reserves. Most cercariae encyst as metacercariae in second intermediate hosts which are prey of the definitive host; in certain species, the interruption of the active life is achieved by an encystment in the external environment (or a simple immobile waiting strategy in a few species). In some two-host life cycles, the cercariae develop into adults after penetration (this is the case for various species causing human schistosomiasis). Some cercariae do not leave the mollusc which must then be ingested by the definitive host.

Keywords

Host-locationtrematodecercariabehaviourtransmissionecology
Type
Research Article
Information
Parasitology , Volume 109 , supplement S1: Parasites and behaviour , 1994 , pp. S3 - S13
Copyright
Copyright © Cambridge University Press 1994

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