Exposé Chercheur Invité

Spéciation chez les vers de terre hermaphrodites

Pavlíček Tomáš (Institute of Evolution, University of Haifa)

Sympatric speciation starting in a panmictic animal population where mating is random with respect to the birthplace of the mating partners is conventionally not considered as possible. However, this scenario is plausible in the biparental, hermaphroditic earthworms of the genus Lumbricus, as shown by the network of significant intra-specifition homoploid hybrid lineages and by the hybridization network we constructed for this genus. The clitellum, apart of its primary function as sexual trait and prezygotic reproductive barrier, is also a suitable predictor of a saltational change in the total number of body segments. The homoploid intralineage hybridization, restricted to the genomic island of divergence controlling prezygotic reproductive barrier, produces sympatrically new lineages. These lineages are characterized by the presence of a constant total number of body segments and bring the following advantages to earthworms: a) quick evolution and possibility of speciation in a panmictic population, b) saltational change in the total number of body segments allowing niche shift, and c) preservation of a linkage disequilibria between distant loci and thus avoidance of a hybrid breakdown.

Salle Silvolab (Campus de Kourou)

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