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Phylogeography of the Guinea multimammate mouse (Mastomys erythroleucus): a case study for Sahelian species in West Africa

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Abstract:

Abstract Aim 

To investigate the phylogeographical structure of the Guinea multimammate mouse, Mastomys erythroleucus (Temminck, 1853), a widespread murid rodent in sub-Saharan (Sahel and Sudan) savannas, for a better understanding of the impacts of geographical and historical factors on the evolutionary history of this species, in the context of the growing database of phylogeographical studies of African savanna mammal species. Location 

Sahel and Sudan savannas, Africa. Methods 

We sequenced the whole cytochrome b gene in 211 individuals from 59 localities distributed from Senegal to Ethiopia. Sequence data were analysed using both phylogenetic (several rooted tree-construction methods, median-joining networks) and population genetic methods (spatial analyses of molecular variance, mismatch distributions). Results 

Haplotypes were distributed into four major monophyletic groups corresponding to distinct geographical regions across a west–east axis. Diversification events were estimated to have occurred between 1.16 and 0.18 Ma. Main conclusions 

Vicariance events related to the fragmentation of savanna habitats during the Pleistocene era may explain the phylogeographical patterns observed. Genetic structure was consistent with a role of major Sahelian rivers as significant barriers to west–east dispersal. Recent demographic expansions probably occurred during arid phases of the Holocene with the southward expansion of savannas.

Keywords: Africa; Mastomys erythroleucus; Quaternary history; mtDNA; phylogeography; rodent; savanna; sub-Sahara

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1365-2699.2009.02184.x

Affiliations: 1: UMR IRD (UR 022)-INRA-CIRAD, Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, Montferrier/Lez cedex, France 2: IRD (UR 022), Centre de Biologie et de Gestion des Populations, Dakar, Senegal 3: Museum National d’Histoire Naturelle, UMR 5202 ‘Origine, Structure et Evolution de la Biodiversité’, Département Systématique et Evolution, Paris, France

Publication date: December 1, 2009

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