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Genomics of the divergence continuum in an African plant biodiversity hotspot, I: drivers of population divergence in Restio capensis (Restionaceae)

hal.structure.identifierUniversité de Fribourg = University of Fribourg [UNIFR]
dc.contributor.authorLEXER, C.
hal.structure.identifierLandscape Dynamics Unit
hal.structure.identifierLaboratoire d'Ecologie Alpine [LECA]
dc.contributor.authorWÜEST, R. O.
hal.structure.identifierUniversité de Fribourg = University of Fribourg [UNIFR]
dc.contributor.authorMANGILI, S.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
hal.structure.identifierUniversité de Fribourg = University of Fribourg [UNIFR]
hal.structure.identifierInstituto Nacional de Investigación y Tecnología Agraria y Alimentaria = National Institute for Agricultural and Food Research and Technology [INIA]
dc.contributor.authorHEUERTZ, Myriam
hal.structure.identifierUniversité de Fribourg = University of Fribourg [UNIFR]
dc.contributor.authorSTÖLTING, K. N.
hal.structure.identifierLandscape Dynamics Unit
dc.contributor.authorPEARMAN, P. B.
hal.structure.identifierJodrell Laboratory
dc.contributor.authorFOREST, F.
hal.structure.identifierDepartment of Ecology & Evolution
hal.structure.identifierSwiss Institute of Bioinformatics [Lausanne] [SIB]
dc.contributor.authorSALAMIN, N.
hal.structure.identifierLandscape Dynamics Unit
dc.contributor.authorZIMMERMANN, N. E.
hal.structure.identifierUniversité de Fribourg = University of Fribourg [UNIFR]
hal.structure.identifierBayer Crop Science NV
dc.contributor.authorBOSSOLINI, E.
dc.date.issued2014
dc.identifier.issn0962-1083
dc.description.abstractEnUnderstanding the drivers of population divergence, speciation and species persistence is of great interest to molecular ecology, especially for species-rich radiations inhabiting the world's biodiversity hotspots. The toolbox of population genomics holds great promise for addressing these key issues, especially if genomic data are analysed within a spatially and ecologically explicit context. We have studied the earliest stages of the divergence continuum in the Restionaceae, a species-rich and ecologically important plant family of the Cape Floristic Region (CFR) of South Africa, using the widespread CFR endemic Restio capensis (L.) H.P. Linder & C.R. Hardy as an example. We studied diverging populations of this morphotaxon for plastid DNA sequences and >14 400 nuclear DNA polymorphisms from Restriction site Associated DNA (RAD) sequencing and analysed the results jointly with spatial, climatic and phytogeographic data, using a Bayesian generalized linear mixed modelling (GLMM) approach. The results indicate that population divergence across the extreme environmental mosaic of the CFR is mostly driven by isolation by environment (IBE) rather than isolation by distance (IBD) for both neutral and non-neutral markers, consistent with genome hitchhiking or coupling effects during early stages of divergence. Mixed modelling of plastid DNA and single divergent outlier loci from a Bayesian genome scan confirmed the predominant role of climate and pointed to additional drivers of divergence, such as drift and ecological agents of selection captured by phytogeographic zones. Our study demonstrates the usefulness of population genomics for disentangling the effects of IBD and IBE along the divergence continuum often found in species radiations across heterogeneous ecological landscapes.
dc.language.isoen
dc.publisherWiley
dc.subjectpopulation divergence
dc.subjectcape Floristic Region
dc.subject.enRAD sequencing
dc.subject.enisolation by adaptation
dc.subject.enisolation by environment
dc.subject.enspeciation
dc.title.enGenomics of the divergence continuum in an African plant biodiversity hotspot, I: drivers of population divergence in Restio capensis (Restionaceae)
dc.typeArticle de revue
dc.identifier.doi10.1111/mec.12870
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalMolecular Ecology
bordeaux.page4373-4386
bordeaux.volume23
bordeaux.issue17
bordeaux.peerReviewedoui
hal.identifierhal-02634127
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02634127v1
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