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Egg production by metacercariae of Microphallus papillorobustus: a reproductive insurance?

Published online by Cambridge University Press:  12 April 2024

C.L. Wang  and
F. Thomas
C.L. Wang
Affiliation:
Centre d'Etude sur le Polymorphisme des Micro-Organismes CEPM/UMR CNRS-IRD 9926 Equipe: ‘Evolution des Systèmes Symbiotiques’, IRD, 911 Avenue Agropolis, B.P. 5045 34032 Montpellier Cedex 1, France.
F. Thomas*
Affiliation:
Centre d'Etude sur le Polymorphisme des Micro-Organismes CEPM/UMR CNRS-IRD 9926 Equipe: ‘Evolution des Systèmes Symbiotiques’, IRD, 911 Avenue Agropolis, B.P. 5045 34032 Montpellier Cedex 1, France.
*
*Author for correspondence Fax: (33) 04 67 41 62 99, E-mail: [email protected]
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Abstract

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This study aimed to determine whether metacercariae of Microphallus papillorobustus (Trematoda: Microphallidae) produce eggs by self-fertilization when their intermediate host, the gammarid Gammarus insensibilis, dies before being eaten by predatory definitive hosts. Such a mechanism would allow the parasite to reproduce even if transmission fails. The percentage of metacercariae that produced eggs and the mean number of eggs were significantly higher in metacercariae placed in a Ringer's solution compared with those in salt water or metacercariae remaining inside the dead gammarid. The lack of egg production in metacercariae removed from dead gammarids in the field supported the idea that self-fertilization is not, for this parasite, a mechanism of reproductive insurance when establishment in the definitive hosts fails.

Type
Research Article
Information
Journal of Helminthology , Volume 76 , Issue 3 , September 2002 , pp. 279 - 281
Copyright
Copyright © Cambridge University Press 2002

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