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Two reproductively isolated cytotypes and a swarm of highly inbred, disconnected populations: a glimpse into Salicornia's evolutionary history and challenging taxonomy

par Vanderpoorten, Alain ;Hardy, Olivier J. ;Lambinon, Jacques;Raspe, O.
Référence Journal of evolutionary biology, 24, page (630-644)
Publication Publié, 2011

Article révisé par les pairs

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Résumé :

The main factor of differentiation at six nuclear microsatellite and seven cpDNA loci in Salicornia from the Mediterranean and Atlantic coasts of France is cytotypic identity, suggesting the presence of a strong reproductive barrier among sympatric cytotypes. Within cytotypes, a substantial proportion of the differentiation between species is due to confounded phylogeographic signal. Conspecific individuals tend to be significantly more related than individuals from different species at the population scale, but mean kinship coefficients among pairs of conspecific and nonconspecific individuals from different populations are not significantly different, suggesting the absence of reproductive isolation among species of the same cytotype. The observed association between morphology and genetic variation within populations would thus result from the selfing mating system (F-is