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Plastome phylogeography in two African rain forest legume trees reveals that Dahomey Gap populations originate from the Cameroon volcanic line

hal.structure.identifierUniversité libre de Bruxelles [ULB]
dc.contributor.authorDEMENOU, Boris
hal.structure.identifierUniversité libre de Bruxelles [ULB]
dc.contributor.authorMIGLIORE, Jérémy
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorHEUERTZ, Myriam
hal.structure.identifierUniversité libre de Bruxelles [ULB]
dc.contributor.authorMONTHE, Franck
hal.structure.identifierUniversité libre de Bruxelles [ULB]
hal.structure.identifierNorsk institutt for bioøkonomi=Norwegian Institute of Bioeconomy Research [NIBIO]
dc.contributor.authorOJEDA, Dario
hal.structure.identifierNaturalis Biodiversity Center [Leiden]
dc.contributor.authorWIERINGA, Jan
hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
dc.contributor.authorDAUBY, Gilles
hal.structure.identifierUniversité libre de Bruxelles [ULB]
hal.structure.identifierEvolution Biologique et Ecologie
dc.contributor.authorALBREHT, Laura
hal.structure.identifierUniversité libre de Bruxelles [ULB]
hal.structure.identifierEvolution Biologique et Ecologie
dc.contributor.authorBOOM, Arthur
hal.structure.identifierUniversité libre de Bruxelles [ULB]
hal.structure.identifierEvolution Biologique et Ecologie
dc.contributor.authorHARDY, Olivier J.
dc.date.issued2020-09
dc.identifier.issn1055-7903
dc.description.abstractEnPaleo-environmental data show that the distribution of African rain forests was affected by Quaternary climate changes. In particular, the Dahomey Gap (DG) – a 200 km wide savanna corridor currently separating the West African and Central African rain forest blocks and containing relict rain forest fragments – was forested during the mid-Holocene and possibly during previous interglacial periods, whereas it was dominated by open vegetation (savanna) during glacial periods. Genetic signatures of past population fragmentation and demographic changes have been found in some African forest plant species using nuclear markers, but such events appear not to have been synchronous or shared across species. To better understand the colonization history of the DG by rain forest trees through seed dispersal, the plastid genomes of two widespread African forest legume trees, Anthonotha macrophylla and Distemonanthus benthamianus, were sequenced in 47 individuals for each species, providing unprecedented phylogenetic resolution of their maternal lineages (857 and 115 SNPs, respectively). Both species exhibit distinct lineages separating three regions: 1. Upper Guinea (UG, i.e. the West African forest block), 2. the area ranging from the DG to the Cameroon volcanic line (CVL), and 3. Lower Guinea (LG, the western part of the Central African forest block) where three lineages co-occur. In both species, the DG populations (including southern Nigeria west of Cross River) exhibit much lower genetic diversity than UG and LG populations, and their plastid lineages originate from the CVL, confirming the role of the CVL as an ancient forest refuge. Despite the similar phylogeographic structures displayed by A. macrophylla and D. benthamianus, molecular dating indicates very contrasting ages of lineage divergence (UG diverged from LG since c. 7 Ma and 0.7 Ma, respectively) and DG colonization (probably following the Mid Pleistocene Transition and the Last Glacial Maximum, respectively). The stability of forest refuge areas and repeated similar forest shrinking/expanding events during successive glacial periods might explain why similar phylogeographic patterns can be generated over contrasting timescales.
dc.language.isoen
dc.publisherElsevier
dc.subject.enAfrican rain forest
dc.subject.enCameroon volcanic line
dc.subject.enColonization origin
dc.subject.enDahomey gap
dc.subject.enPhylogeography
dc.subject.enPlastid genome sequencing
dc.title.enPlastome phylogeography in two African rain forest legume trees reveals that Dahomey Gap populations originate from the Cameroon volcanic line
dc.typeArticle de revue
dc.identifier.doi10.1016/j.ympev.2020.106854
dc.subject.halSciences du Vivant [q-bio]/Biodiversité/Systématique, phylogénie et taxonomie
dc.subject.halSciences du Vivant [q-bio]/Ecologie, Environnement/Ecosystèmes
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale/Botanique
dc.subject.halSciences de l'environnement/Biodiversité et Ecologie
bordeaux.journalMolecular Phylogenetics and Evolution
bordeaux.page1-12
bordeaux.volume150
bordeaux.peerReviewedoui
hal.identifierhal-02893119
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02893119v1
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