Genomics of the divergence continuum in an African plant biodiversity hotspot, I: drivers of population divergence in Restio capensis (Restionaceae)
| Autor: | Christian Lexer, Félix Forest, Myriam Heuertz, Rafael O. Wüest, Niklaus E. Zimmermann, Eligio Bossolini, Nicolas Salamin, Sofia Mangili, Kai N. Stölting, Peter B. Pearman |
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| Přispěvatelé: | Universite de Fribourg, Landscape Dynamics Unit, Swiss Federal Research Institute (WSL), Laboratoire d'Ecologie Alpine (LECA), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Biodiversité, Gènes & Communautés (BioGeCo), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria = National Institute for Agricultural and Food Research and Technology (INIA), Jodrell Laboratory, Royal Botanic Garden , Kew, Department of Ecology & Evolution, Université de Lausanne (UNIL), Swiss Institute of Bioinformatics [Lausanne] (SIB), Bayer Crop Science NV, Partenaires INRAE |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Restio
DNA Plant [SDV]Life Sciences [q-bio] Population Molecular Sequence Data Genomics Environment RAD sequencing Polymorphism Single Nucleotide isolation by adaptation Molecular ecology Population genomics Magnoliopsida South Africa Genetics isolation by environment education Ecology Evolution Behavior and Systematics Isolation by distance education.field_of_study biology Models Genetic Ecology DNA Chloroplast Bayes Theorem Biodiversity Sequence Analysis DNA 15. Life on land biology.organism_classification Biodiversity hotspot Phylogeography Genetics Population speciation Restionaceae Linear Models cape Floristic Region population divergence |
| Zdroj: | Molecular Ecology Molecular Ecology, Wiley, 2014, 23 (17), pp.4373-4386. ⟨10.1111/mec.12870⟩ Repositorio de Resultados de Investigación del INIA INIA: Repositorio de Resultados de Investigación del INIA Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria INIA |
| ISSN: | 0962-1083 1365-294X |
| Popis: | Understanding 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. |
| Databáze: | OpenAIRE |
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