HAMPE, Arndt; PEMONGE, Marie-Hélène; PETIT R.J., Remy

doi:10.1098/rspb.2013.1070

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HAMPE, Arndt
Biodiversité, Gènes & Communautés [BioGeCo]

PEMONGE, Marie-Hélène
Université Sciences et Technologies - Bordeaux 1 [UB]

PETIT R.J., Remy
Biodiversité, Gènes & Communautés [BioGeCo]

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Ce document a été publié dans

Proceedings of the Royal Society B: Biological Sciences. 2013, vol. 280, n° 1764, p. 8 p.

Royal Society, The

Résumé en anglais

Numerous plant species are shifting their range polewards in response to ongoing climate change. Range shifts typically involve the repeated establishment and growth of leading-edge populations well ahead of the main species range. How these populations recover from founder events and associated diversity loss remains poorly understood. To help fill this gap, we exhaustively investigated a newly established population of holm oak (Quercus ilex) growing more than 30 km ahead of the nearest larger stands. Pedigree reconstructions showed that plants belong to two non-overlapping generations and that the whole population originates from only two founder trees. The four first-generation trees that have reached maturity showed disparate mating patterns despite being full-sibs. Long-distance pollen immigration was notable despite the strong isolation of the stand: 6 per cent gene flow events in acorns collected on the trees (n = 255), and as much as 27 per cent among their established offspring (n = 33). Our results show that isolated leading-edge populations of wind-pollinated forest trees can rapidly restore their genetic diversity through the interacting effects of efficient long-distance pollen flow and purging of inbred individuals during recruitment. They imply that range expansions of these species are primarily constrained by initial propagule arrival rather than by subsequent gene flow.< Réduire

Mots clés en anglais

founder event; genetic rescue; inbreeding depression; long-distance gene flow; Quercus ilex; range expansion

DOI

http://dx.doi.org/10.1098/rspb.2013.1070

Project ANR

Scénarios pour la dynamique de la biodiversité des forêts européennes sous changement global identifier les points de basculement micro-evolutifs - ANR-12-EBID-0003

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Importé de hal

Unités de recherche

BioGeCo (Biodiversité Gènes & Communautés) - UMR 1202