Show simple item record

Evolutionary history of tropical tree species complexes: species delimitation and adaptive genetic variation in the Brazil nut clade (Lecythidaceae)

hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorHEUERTZ, Myriam
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorJEHANNE, Quentin
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorBUDDE, Katharina
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorCARON, Henri
hal.structure.identifierEcologie des forêts de Guyane [ECOFOG]
dc.contributor.authorTYSKLIND, Niklas
hal.structure.identifierEcologie des Forêts Méditerranéennes [URFM]
dc.contributor.authorSCOTTI-SAINTAGNE, Caroline
hal.structure.identifierInstitut National de la Recherche Agronomique [INRA]
dc.contributor.authorGUICHOUX, Erwan
hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
dc.contributor.authorMOLINO, Jean-François
hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
dc.contributor.authorSABATIER, Daniel
hal.structure.identifierInstituto Nacional de Tecnología Agropecuaria [INTA]
dc.contributor.authorEL MUTJAR, Veronica
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorFRANC, Alain
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorGARNIER‐GÉRÉ, Pauline
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorMARIETTE, Stéphanie
dc.date.conference2018-08-18
dc.description.abstractEnTropical tree species complexes harbour closely related species that display shared alleles and that are difficult to delimit using phylogenetic approaches. Such species complexes arise when lineage sorting is slow due to large effective population sizes typical in trees, when diversification is accompanied by interspecific gene flow, or due to a combination of both processes. The concerned species are often difficult to distinguish morphologically due to high phenotypic trait variation. The large intraspecific variation typical of tree species complexes promotes adaptive processes, suggesting that species complexes are important in the diversification of tropical tree biodiversity. The evolutionary histories of these systems remain however poorly understood.We here investigated the evolutionary history of tropical tree species complexes by examining the phylogeny and population genetic processes in sympatric taxa of the Bertholletia clade (Brazil nut clade, Lecythidaceae) in French Guiana. We sampled 192 individuals belonging to 26 tree species of the Bertholletia clade and sequenced them at nine plastid, eight mitochondrial and 134 putative nuclear loci derived from double-digest restriction site associated DNA sequencing (ddRAD-Seq). Phylogenetic methods recovered the expected large sub-clades within the Bertholletia clade, but genetic clustering methods were needed to delimit species within these clades. Some common species such as Eschweilera coriacea, harboured several sympatric gene pools, indicative of hitherto undescribed cryptic species. Outlier detection methods revealed that few single nucleotide polymorphisms (SNPs) were strongly diverged among gene pools, whereas a significant portion of SNPs was more shared than expected a priori in sympatric populations. The local pattern of allele sharing pointed to hybridization, rather than incomplete lineage sorting. Taken together, our results suggest thathybridization is important for adaptive evolution in tropical tree species complexes.
dc.language.isoen
dc.subject.entropical trees
dc.subject.enpopulation genetics
dc.subject.enphylogenetic relationships
dc.subject.enspecies complexes
dc.title.enEvolutionary history of tropical tree species complexes: species delimitation and adaptive genetic variation in the Brazil nut clade (Lecythidaceae)
dc.typeAutre communication scientifique (congrès sans actes - poster - séminaire...)
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale/Botanique
dc.subject.halSciences du Vivant [q-bio]/Biodiversité/Evolution [q-bio.PE]
dc.subject.halSciences du Vivant [q-bio]/Biodiversité/Systématique, phylogénie et taxonomie
bordeaux.conference.titleII Joint Congress on Evolutionary Biology
bordeaux.countryFR
bordeaux.conference.cityMontpellier
bordeaux.peerReviewedoui
hal.identifierhal-04948623
hal.version1
hal.invitednon
hal.proceedingsnon
hal.conference.organizerESEB, SSN, SAN, SSE
hal.conference.end2018-08-22
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04948623v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.au=HEUERTZ,%20Myriam&JEHANNE,%20Quentin&BUDDE,%20Katharina&CARON,%20Henri&TYSKLIND,%20Niklas&rft.genre=conference


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record