Reference : Cytonuclear discordance among Southeast Asian black rats (Rattus rattus complex)
Scientific journals : Article
Life sciences : Genetics & genetic processes
http://hdl.handle.net/2268/139262
Cytonuclear discordance among Southeast Asian black rats (Rattus rattus complex)
English
Pagès, Marie [Université de Liège - ULiège > Département des sciences de la vie > Génétique >]
2013
Molecular Ecology
Blackwell Publishing
Yes (verified by ORBi)
International
0962-1083
1365-294X
Oxford
United Kingdom
[en] incomplete lineage sorting, introgression, paraphyly, Rattus, recent speciation, species complex
[en] Black rats are major invasive vertebrate pests with severe ecological, economic and health impacts. Remarkably, their evolutionary history has received little attention and there is no firm agreement on how many species should be recognized within the black rat complex. This species complex is native to India and Southeast Asia. According to current taxonomic classification, there are three taxa living in sympatry in several parts of Thailand, Cambodia and Lao People's Democratic Republic, where this study was conducted: two accepted species (Rattus tanezumi, Rattus sakeratensis) and an additional mitochondrial lineage of unclear taxonomic status referred to here as ‘Rattus R3’. We used extensive sampling, morphological data and diverse genetic markers differing in rates of evolution and parental inheritance (two mitochondrial DNA genes, one nuclear gene and eight microsatellite loci) to assess the reproductive isolation of these three taxa. Two close Asian relatives, Rattus argentiventer and Rattus exulans, were also included in the genetic analyses. Genetic analyses revealed discordance between the mitochondrial and nuclear data. Mitochondrial phylogeny studies identified three reciprocally monophyletic clades in the black rat complex. However, studies of the phylogeny of the nuclear exon IRBP and clustering and assignation analyses with eight microsatellites failed to separate R. tanezumi and R3. Morphometric analyses were consistent with nuclear data. The incongruence between mitochondrial and nuclear (and morphological) data rendered R. tanezumi/R3 paraphyletic for mitochondrial lineages with respect to R. sakeratensis. Various evolutionary processes, such as shared ancestral polymorphism and incomplete lineage sorting or hybridization with massive mitochondrial introgression between species, may account for this unusual genetic pattern in mammals.
Université de Liège ; Centre de Biologie pour la Gestion des Populations
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; French National Agency for Research project CERoPath [00121 0505, 07 BDIV 012]
http://hdl.handle.net/2268/139262
10.1111/mec.12149

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