Abstract：
:Population genetic signatures of local adaptation are frequently investigated by identifying loci with allele frequencies that exhibit high correlation with ecological variables. One difficulty with this approach is that ecological associations might be confounded by geographic variation at selectively neutral loci. Here, we consider populations that underwent spatial expansion from their original range, and for which geographical variation of adaptive allele frequency coincides with habitat gradients. Using range expansion simulations, we asked whether our ability to detect genomic regions involved in adaptation could be impacted by the orientation of the ecological gradients. For three ecological association methods tested, we found, counter-intuitively, fewer false-positive associations when ecological gradients aligned along the main axis of expansion than when they aligned along any other direction. This result has important consequences for the analysis of genomic data under non-equilibrium population genetic models. Alignment of gradients with expansion axes is likely to be common in scenarios in which expanding species track their ecological niche during climate change while adapting to changing environments at their rear edge.
journal_name
Heredity (Edinb)journal_title
Heredityauthors
Frichot E,Schoville SD,de Villemereuil P,Gaggiotti OE,François Odoi
10.1038/hdy.2015.7subject
Has Abstractpub_date
2015-07-01 00:00:00pages
22-8issue
1eissn
0018-067Xissn
1365-2540pii
hdy20157journal_volume
115pub_type
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