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

Autor: Boris B. Demenou, Myriam Heuertz, Laura Albreht, Dario I. Ojeda, Jérémy Migliore, Jan J. Wieringa, Olivier J. Hardy, Gilles Dauby, Franck K. Monthe, Arthur Boom
Přispěvatelé: Université libre de Bruxelles (ULB), Biodiversité, Gènes & Communautés (BioGeCo), Université de Bordeaux (UB)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Norwegian Institute of Bioeconomy Research (NIBIO), Naturalis Biodiversity Center [Leiden], Botanique et Modélisation de l'Architecture des Plantes et des Végétations (UMR AMAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Evolution Biologique et Ecologie, Université de Bruxelles
Jazyk: angličtina
Rok vydání: 2020
Předmět:
0106 biological sciences
0301 basic medicine
Colonization origin
Population fragmentation
Rainforest
Cameroon volcanic line
Pleistocene
Seed dispersal
Lineage (evolution)
Biology
[SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics
Phylogenetics and taxonomy
010603 evolutionary biology
01 natural sciences
03 medical and health sciences
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology
environment/Ecosystems
Genetics
Benin
Dahomey gap
Cameroon
Plastids
Glacial period
Molecular Biology
Phylogeny
Ecology
Evolution
Behavior and Systematics
Ecology
Plastid genome sequencing
Genetic Variation
Fabaceae
Last Glacial Maximum
[SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics
15. Life on land
Biosystematiek
Phylogeography
030104 developmental biology
African rain forest
Haplotypes
13. Climate action
Biosystematics
[SDE.BE]Environmental Sciences/Biodiversity and Ecology
Biologie
Zdroj: Molecular Phylogenetics and Evolution 150 (2020)
Molecular phylogenetics and evolution, 150
Molecular Phylogenetics and Evolution
Molecular Phylogenetics and Evolution, Elsevier, 2020, 150, pp.1-12. ⟨10.1016/j.ympev.2020.106854⟩
Molecular Phylogenetics and Evolution, 150
ISSN: 1055-7903
1095-9513
DOI: 10.1016/j.ympev.2020.106854
Popis: Paleo-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.
Databáze: OpenAIRE
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