Reference : Speciation slowing down in widespread and long-living tree taxa : insights from the t...
Scientific journals : Article
Life sciences : Phytobiology (plant sciences, forestry, mycology...)
Life sciences : Genetics & genetic processes
http://hdl.handle.net/2268/164890
Speciation slowing down in widespread and long-living tree taxa : insights from the tropical timber tree genus Milicia (Moraceae)
English
Daïnou, Kasso mailto [Université de Liège - ULiège > Forêts, Nature et Paysage > Laboratoire de Foresterie des régions trop. et subtropicales >]
Mahy, Grégory mailto [Université de Liège - ULiège > Forêts, Nature et Paysage > Biodiversité et Paysage >]
Duminil, Jérôme [> >]
Dick, CW [> >]
Doucet, Jean-Louis [Université de Liège - ULiège > Forêts, Nature et Paysage > Laboratoire de Foresterie des régions trop. et subtropicales >]
Donkpegan, Segbedji mailto [Université de Liège - ULiège > > > Doct. sc. agro. & ingé. biol.]
Pluijgers, Michael [> >]
Sinsin, Brice [> >]
Lejeune, Philippe mailto [Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels >]
Hardy, Olivier [> >]
19-Feb-2014
Heredity
Nature Publishing Group
1-12
Yes (verified by ORBi)
International
0018-067X
1365-2540
London
United Kingdom
[en] Milicia ; Speciation ; Phylogeny ; Phylogeography ; Tertiary diversification
[en] The long generation time and large effective size of widespread forest tree species can result in slow evolutionary rate and incomplete lineage sorting, complicating species delimitation. We addressed this issue with the African timber tree genus Milicia that comprises two morphologically similar and often confounded species: M. excelsa, widespread from West to East Africa, and M. regia, endemic to West Africa. We combined information from nuclear microsatellites (nSSRs), nuclear and plastid DNA sequences, and morphological systematics to identify significant evolutionary units and infer their evolutionary and biogeographical history. We detected five geographically coherent genetic clusters using nSSRs and three levels of genetic differentiation. First, one West African cluster matched perfectly with the morphospecies M. regia that formed a monophyletic clade at both DNA sequences. Second, a West African M. excelsa cluster formed a monophyletic group at plastid DNA and was more related to M. regia than to Central African M. excelsa, but shared many haplotypes with the latter at nuclear DNA. Third, three Central African clusters appeared little differentiated and shared most of their haplotypes. Although gene tree paraphyly could suggest a single species in Milicia following the phylogenetic species concept, the existence of mutual haplotypic exclusivity and nonadmixed genetic clusters in the contact area of the two taxa indicate strong reproductive isolation and, thus, two species following the biological species concept. Molecular dating of the first divergence events showed that speciation in Milicia is ancient (Tertiary), indicating that long-living tree taxa exhibiting genetic speciation may remain similar morphologically.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/164890
10.1038/hdy.2014.5

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