title: The joint evolution and maintenance of self-incompatibility with gynodioecy or androdioecy.
abstract: Mating systems show two kinds of frequent transitions: from hermaphroditism to dioecy, gynodioecy or androdioecy, or from self-incompatibility (SI) to self-compatibility (SC). While models have mostly investigated these two kinds of transitions as independent, empirical observations suggest that, to some extent, they can evolve jointly. Here, we study the joint evolution and maintenance of SI and androdioecy or SI and gynodioecy by the means of phenotypic models. Our models focus on three parameters: the unisexuals׳ advantage relative to that of the hermaphrodites due to resource reallocation, inbreeding depression and the selfing rate. We assume no pollen limitation or discounting. We show that SI helps the maintenance of androdioecy, but favors the loss of gynodioecy, and also that androdioecy facilitates the maintenance of SI, whereas gynodioecy does not affect it. We finally investigate how gynodioecy and androdioecy may affect the diversification of SI groups, especially considering an evolutionary pathway through SC intermediates. We show that while androdioecy prevents the increase of the number of SI groups, under certain conditions of inbreeding depression and selfing rates, gynodioecy allows it.
authors: Unité (EEP), Université des Sciences et Technologies Lille 1, Cité scientifique, 59655 Villeneuve d׳Ascq Cedex, France. Electronic address: vandepaer.celine@gmail.com.
authors: Céline
authors: C
authors: Van de Paer
authors: Unité (EEP), Université des Sciences et Technologies Lille 1, Cité scientifique, 59655 Villeneuve d׳Ascq Cedex, France. Electronic address: pierre.saumitou-laprade@univ-lille1.fr.
authors: Pierre
authors: P
authors: Saumitou-Laprade
authors: Unité (EEP), Université des Sciences et Technologies Lille 1, Cité scientifique, 59655 Villeneuve d׳Ascq Cedex, France. Electronic address: philippe.vernet@univ-lille1.fr.
authors: Philippe
authors: P
authors: Vernet
authors: Unité (EEP), Université des Sciences et Technologies Lille 1, Cité scientifique, 59655 Villeneuve d׳Ascq Cedex, France. Electronic address: sylvain.billiard@univ-lille1.fr.
authors: Sylvain
authors: S
authors: Billiard
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005260:Female; D057850:Hermaphroditic Organisms / Q000502:physiology*; D008297:Male; D008954:Models, Biological; D009154:Mutation / Q000235:genetics
keywords: Dioecy; Hermaphroditism; Mating systems; Phenotypic model; Self-incompatibility breakdown