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The Journal of Heredity 1999:90(5)
© 1999 The American Genetic Association 90:582-585

Brief communication. Reproductive and mate choice strategies in the hermaphroditic flatworm Echinostoma caproni

S Trouvé1,*, F Renaud2, P Durand1, and J Jourdane1

1Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Laboratoire de Biologie Animale, Université de Perpignan, Perpignan, France 2Centre d'Etude sur le Polymorphisme des Micro-Organismes, CEPM/UMR CNRS-IRD, Equipe: 'Evolution des Systèmes Symbiotiques, Montpellier, France *Corresponding author at: Institut de Zoologie et d'Ecologie Animale, Bãtiment de Biologie, Université de Lausanne, 1015 Lausanne, Switzerland. E-mail: sandrine.trouve@ie-zea.unil.ch

Due to the important role that mating systems play in the evolution of species, we investigate the selfing rate and mate choice in the simultaneous hermaphroditic parasite Echinostoma caproni (Trematoda). The echinostomes were maintained in two situations in mice: (1) double infections where the two individuals do or do not belong to the same geographic area isolate, and (2) triple infections where two of the three individuals originate from the same isolate and the third one originates from a different isolate. This experimental design permits analysis of intra- and interisolate selfing rates. In the second experiment we expect a preferential outcrossing between individuals originating from the same isolate in order to avoid hybrid breakdown. The results obtained corroborate our predictions and emphasize the important and synergistic roles of selfing, inbreeding depression, and hybrid breakdown in the evolution of echinostome reproductive strategies. Hence further work is needed to distinguish between these hypotheses.


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