Heterogeneity in local density allows a positive evolutionary relationship between self-fertilisation and dispersal.

Détails

ID Serval
serval:BIB_7289609B1610
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Heterogeneity in local density allows a positive evolutionary relationship between self-fertilisation and dispersal.
Périodique
Evolution
Auteur(s)
Rodger J.G., Landi P., Hui C.
ISSN
1558-5646 (Electronic)
ISSN-L
0014-3820
Statut éditorial
Publié
Date de publication
2018
Peer-reviewed
Oui
Volume
72
Numéro
9
Pages
1784-1800
Langue
anglais
Résumé
Despite empirical evidence for a positive relationship between dispersal and self-fertilization (selfing), theoretical work predicts that these traits should always be negatively correlated, and the Good Coloniser Syndrome of high dispersal and selfing (Cf. Baker's Law) should not evolve. Critically, previous work assumes that adult density is spatiotemporally homogeneous, so selfing results in identical offspring production for all patches, eliminating the benefit of dispersal for escaping from local resource competition. We investigate the joint evolution of dispersal and selfing in a demographically structured metapopulation model where local density is spatiotemporally heterogeneous due to extinction-recolonization dynamics. Selfing alleviates outcrossing failure due to low local density (an Allee effect) while dispersal alleviates competition through dispersal of propagules from high- to low-density patches. Because local density is spatiotemporally heterogeneous in our model, selfing does not eliminate heterogeneity in competition, so dispersal remains beneficial even under full selfing. Hence the Good Coloniser Syndrome is evolutionarily stable under a broad range of conditions, and both negative and positive relationships between dispersal and selfing are possible, depending on the environment. Our model thus accommodates positive empirical relationships between dispersal and selfing not predicted by previous theoretical work and provides additional explanations for negative relationships.
Mots-clé
Allee effects, Baker's Law, adaptive dynamics, dispersal, mating system, self-fertilization
Pubmed
Web of science
Création de la notice
21/08/2018 18:18
Dernière modification de la notice
20/08/2019 15:30
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