Journal Article

Divergent selection in trailing- versus leading-edge populations of <i>Biscutella laevigata</i>

Christian Parisod and Stéphane Joost

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 105, issue 4, pages 655-660
Published in print April 2010 | ISSN: 0305-7364
Published online February 2010 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcq014
Divergent selection in trailing- versus leading-edge populations of Biscutella laevigata

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  • Ecology and Conservation
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Background and Aims

Knowledge on how climate-induced range shifts might affect natural selection is crucial to understand the evolution of species ranges.

Methods

Using historical demographic perspectives gathered from regional-scale phylogeography on the alpine herb Biscutella laevigata, indirect inferences on gene flow and signature of selection based on AFLP genotyping were compared between local populations persisting at the trailing edge and expanding at the leading edge.

Key Results

Spatial autocorrelation revealed that gene flow was two times more restricted at the trailing edge and genome scans indicated divergent selection in this persisting population. In contrast, no pattern of selection emerged in the expanding population at the leading edge.

Conclusions

Historical effects may determine different architecture of genetic variation and selective patterns within local populations, what is arguably important to understand evolutionary processes acting across the species ranges.

Keywords: Amplified fragment length polymorphism; Biscutella laevigata (Brassicaceae); gene flow; genome scan; landscape genetics; range margins; selection; species range shift

Journal Article.  3305 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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