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

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Type
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Title
Natural selection in a postglacial range expansion: the case of the colour cline in the European barn owl.
Journal
Molecular Ecology
Author(s)
Antoniazza S., Kanitz R., Neuenschwander S., Burri R., Gaigher A., Roulin A., Goudet J.
ISSN
1365-294X (Electronic)
ISSN-L
0962-1083
Publication state
Published
Issued date
2014
Peer-reviewed
Oui
Volume
23
Number
22
Pages
5508-5523
Language
english
Abstract
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.
Keywords
approximate Bayesian computation, cline, colour polymorphism, natural selection, range expansion
Pubmed
Web of science
Create date
24/10/2014 12:03
Last modification date
20/08/2019 15:06
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