Natural selection in a postglacial range expansion: the case of the colour cline in the European barn owl.

Détails

Ressource 1Demande d'une copieEtat: Supprimée
Version: de l'auteur
ID Serval
serval:BIB_A02C8265EEBB
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Natural selection in a postglacial range expansion: the case of the colour cline in the European barn owl.
Périodique
Molecular Ecology
Auteur(s)
Antoniazza S., Kanitz R., Neuenschwander S., Burri R., Gaigher A., Roulin A., Goudet J.
ISSN
1365-294X (Electronic)
ISSN-L
0962-1083
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
23
Numéro
22
Pages
5508-5523
Langue
anglais
Résumé
Gradients of variation-or clines-have always intrigued biologists. Classically, they have been interpreted as the outcomes of antagonistic interactions between selection and gene flow. Alternatively, clines may also establish neutrally with isolation by distance (IBD) or secondary contact between previously isolated populations. The relative importance of natural selection and these two neutral processes in the establishment of clinal variation can be tested by comparing genetic differentiation at neutral genetic markers and at the studied trait. A third neutral process, surfing of a newly arisen mutation during the colonization of a new habitat, is more difficult to test. Here, we designed a spatially explicit approximate Bayesian computation (ABC) simulation framework to evaluate whether the strong cline in the genetically based reddish coloration observed in the European barn owl (Tyto alba) arose as a by-product of a range expansion or whether selection has to be invoked to explain this colour cline, for which we have previously ruled out the actions of IBD or secondary contact. Using ABC simulations and genetic data on 390 individuals from 20 locations genotyped at 22 microsatellites loci, we first determined how barn owls colonized Europe after the last glaciation. Using these results in new simulations on the evolution of the colour phenotype, and assuming various genetic architectures for the colour trait, we demonstrate that the observed colour cline cannot be due to the surfing of a neutral mutation. Taking advantage of spatially explicit ABC, which proved to be a powerful method to disentangle the respective roles of selection and drift in range expansions, we conclude that the formation of the colour cline observed in the barn owl must be due to natural selection.
Mots-clé
approximate Bayesian computation, cline, colour polymorphism, natural selection, range expansion
Pubmed
Web of science
Création de la notice
24/10/2014 13:03
Dernière modification de la notice
03/03/2018 20:04
Données d'usage