LAGACHE, Lelia; KLEIN, Etienne K.; GUICHOUX, Erwan; PETIT R.J., Remy

doi:10.1111/mec.12121

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LAGACHE, Lelia
Biodiversité, Gènes & Communautés [BioGeCo]

KLEIN, Etienne K.
Biostatistique et Processus Spatiaux [BioSP]

GUICHOUX, Erwan
Biodiversité, Gènes & Communautés [BioGeCo]

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Article de revue

Ce document a été publié dans

Molecular Ecology. 2013, vol. 22, n° 2, p. 423-36

Wiley

Résumé en anglais

Natural hybridization is attracting much interest in modern speciation and conservation biology studies, but the underlying mechanisms remain poorly understood. In particular, it is unclear why environmental changes often increase hybridization rates. To study this question, we surveyed mating events in a mixed oak stand and developed a spatially explicit individual-based hybridization model. This model, where hybridization is frequency-dependent, pollen is nonlimiting and which allows immigrant pollen to compete with local pollen, takes into account species-specific pollen dispersal and sexual barriers to hybridization. The consequences of pollen limitation on hybridization were studied using another simple model. The results indicate that environmental changes could increase hybridization rates through two distinct mechanisms. First, by disrupting the spatial organization of communities, they should decrease the proportion of conspecific pollen available for mating, thus increasing hybridization rates. Second, by decreasing the density of conspecifics, they should increase pollen limitation and thus hybridization rates, as a consequence of chance pollination predominating over deterministic pollen competition. Altogether, our results point to a need for considering hybridization events at the appropriate level of organization and provide new insights into why hybridization rates generally increase in disturbed environments.< Réduire

Mots clés

immigration

pollen limitation

Quercus petraea

Quercus robur

Mots clés en anglais

disturbance

mass action model

paternity analysis

DOI

http://dx.doi.org/10.1111/mec.12121

Project ANR

Relations entre diversité génétique et réponse écologique aux changements environementaux : les arbres forestiers comme modèles d'étude - ANR-08-BDVA-0006

Origine

Importé de hal

Unités de recherche

BioGeCo (Biodiversité Gènes & Communautés) - UMR 1202