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Fine-scale environmental control of hybridization in oaks

hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLAGACHE, Lelia
hal.structure.identifierBiostatistique et Processus Spatiaux [BioSP]
dc.contributor.authorKLEIN, Etienne K.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorGUICHOUX, Erwan
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorPETIT R.J., Remy
dc.date.issued2013
dc.identifier.issn0962-1083
dc.description.abstractEnNatural 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.
dc.description.sponsorshipRelations entre diversité génétique et réponse écologique aux changements environementaux : les arbres forestiers comme modèles d'étude - ANR-08-BDVA-0006
dc.language.isoen
dc.publisherWiley
dc.subjectimmigration
dc.subjectpollen limitation
dc.subjectQuercus petraea
dc.subjectQuercus robur
dc.subject.endisturbance
dc.subject.enmass action model
dc.subject.enpaternity analysis
dc.title.enFine-scale environmental control of hybridization in oaks
dc.typeArticle de revue
dc.identifier.doi10.1111/mec.12121
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halMathématiques [math]
dc.subject.halInformatique [cs]
bordeaux.journalMolecular Ecology
bordeaux.page423-36
bordeaux.volume22
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-02652136
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02652136v1
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