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

Authors

  • Carine Brouat,

    Corresponding author
    1. UMR IRD (UR 022)-INRA-CIRAD, Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, Montferrier/Lez cedex, France
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  • Caroline Tatard,

    1. UMR IRD (UR 022)-INRA-CIRAD, Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, Montferrier/Lez cedex, France
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  • Khalilou Bâ,

    1. IRD (UR 022), Centre de Biologie et de Gestion des Populations, Dakar, Senegal
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  • Jean-François Cosson,

    1. UMR IRD (UR 022)-INRA-CIRAD, Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, Montferrier/Lez cedex, France
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  • Gauthier Dobigny,

    1. UMR IRD (UR 022)-INRA-CIRAD, Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, Montferrier/Lez cedex, France
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  • Elisabeth Fichet-Calvet,

    1. Museum National d’Histoire Naturelle, UMR 5202 ‘Origine, Structure et Evolution de la Biodiversité’, Département Systématique et Evolution, Paris, France
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  • Laurent Granjon,

    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
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  • Emilie Lecompte,

    1. Museum National d’Histoire Naturelle, UMR 5202 ‘Origine, Structure et Evolution de la Biodiversité’, Département Systématique et Evolution, Paris, France
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    • Present addresses:UMR CNRS/UPS 5174 ‘Evolution et Diversité Biologique’, Université Paul Sabatier, 118, Route de Narbonne, 31062 Toulouse cedex 9, France.

  • Anne Loiseau,

    1. UMR IRD (UR 022)-INRA-CIRAD, Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, Montferrier/Lez cedex, France
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  • Karine Mouline,

    1. UMR IRD (UR 022)-INRA-CIRAD, Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, Montferrier/Lez cedex, France
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    • UR016 IRD, Laboratoire de Lutte Contre les Insectes Nuisibles, BP 64501, 34394 Montpellier cedex 5, France.

  • Sylvain Piry,

    1. UMR IRD (UR 022)-INRA-CIRAD, Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, Montferrier/Lez cedex, France
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  • Jean-Marc Duplantier

    1. UMR IRD (UR 022)-INRA-CIRAD, Centre de Biologie et de Gestion des Populations, Campus International de Baillarguet, Montferrier/Lez cedex, France
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*Carine Brouat, CBGP, Campus International de Baillarguet, CS 30016, 34988 Montferrier/Lez cedex, France.
E-mail: brouat@mpl.ird.fr

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.

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