Article (Scientific journals)
Speciation slowing down in widespread and long-living tree taxa : insights from the tropical timber tree genus Milicia (Moraceae)
Daïnou, Kasso; Mahy, Grégory; Duminil, Jérôme et al.
2014In Heredity, p. 1-12
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Keywords :
Milicia; Speciation; Phylogeny; Phylogeography; Tertiary diversification
Abstract :
[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.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Genetics & genetic processes
Author, co-author :
Daïnou, Kasso  ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Laboratoire de Foresterie des régions trop. et subtropicales
Mahy, Grégory ;  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 ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Pluijgers, Michael
Sinsin, Brice
Lejeune, Philippe ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels
Hardy, Olivier
Language :
English
Title :
Speciation slowing down in widespread and long-living tree taxa : insights from the tropical timber tree genus Milicia (Moraceae)
Publication date :
19 February 2014
Journal title :
Heredity
ISSN :
0018-067X
eISSN :
1365-2540
Publisher :
Nature Publishing Group, London, United Kingdom
Pages :
1-12
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 31 March 2014

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