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Experimental evidence of hybrid breakdown between genetically distinct populations of Echinostoma caproni

Published online by Cambridge University Press:  01 August 1998

S. TROUVÉ ,
F. RENAUD ,
P. DURAND  and
J. JOURDANE
S. TROUVÉ
Affiliation:
Centre de Biologie et d'Éocologie Tropicale et Méditerranéenne, Laboratoire de Biologie Animale, UMR 5555 du CNRS, Université de Perpignan, Av. de Villeneuve, 66860 Perpignan Cedex, France
F. RENAUD
Affiliation:
Laboratoire de Parasitologie Comparée, UMR 5555 du CNRS, Université Montpellier II, Place E. Bataillon, 34095 Montpellier Cedex 05, France
P. DURAND
Affiliation:
Centre de Biologie et d'Éocologie Tropicale et Méditerranéenne, Laboratoire de Biologie Animale, UMR 5555 du CNRS, Université de Perpignan, Av. de Villeneuve, 66860 Perpignan Cedex, France
J. JOURDANE
Affiliation:
Centre de Biologie et d'Éocologie Tropicale et Méditerranéenne, Laboratoire de Biologie Animale, UMR 5555 du CNRS, Université de Perpignan, Av. de Villeneuve, 66860 Perpignan Cedex, France
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Abstract

In this paper we investigate whether the assortative mating between individuals of the same genetic entity (i.e. coming from the same geographical area) of Echinostoma caproni, reported in a previous paper, may be explained by a post-zygotic isolating mechanism. The fecundity of the adults of 2 parental genetic entities and of their hybrids (i.e. F1, F2, F3) was quantified through 3 successive generations. Whereas the number of eggs released by F1 hybrids is similar to that of the mid-parent, that of recombinant hybrids (F2–3 hybrids) is significantly lower than that of F1 and that of the mid-parent. Since these results seem to demonstrate hybrid breakdown, 2 important factors maintaining reproductive isolation, i.e. pre-mating reproductive isolation and low hybrid fecundity, may influence the evolution of E. caproni.

Keywords

isolating mechanismshybrid breakdownEchinostoma caproniparasitism
Type
Research Article
Information
Parasitology , Volume 117 , Issue 2 , August 1998 , pp. 133 - 135
Copyright
1998 Cambridge University Press

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