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Multiple refugia and barriers explain the phylogeography of the Valais shrew, Sorex antinorii (Mammalia: Soricomorpha)

Authors

  • GLENN YANNIC,

    Corresponding author
    1. Department of Ecology and Evolution, Biophore Building, University of Lausanne, 1015 Lausanne, Switzerland
    2. Département de Biologie & Centre d'Études Nordiques, University Laval, 1045 Avenue de la Médecine, Québec (QC), G1V 0A6, Canada
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  • LOÏC PELLISSIER,

    1. Department of Ecology and Evolution, Biophore Building, University of Lausanne, 1015 Lausanne, Switzerland
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  • SYLVAIN DUBEY,

    1. Department of Ecology and Evolution, Biophore Building, University of Lausanne, 1015 Lausanne, Switzerland
    2. Shine Laboratory, School of Biological Sciences, A08, University of Sydney, Sydney, NSW 2006, Australia
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  • RODRIGO VEGA,

    1. Department of Ecology and Evolutionary Biology, Corson Hall, Cornell University, Ithaca, NY 14853-2701, USA
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  • PATRICK BASSET,

    1. Hospital Preventive Medicine, University Hospital of Lausanne (CHUV), Lausanne, Switzerland
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  • STEFANO MAZZOTTI,

    1. Museo di Storia Naturale, Via Filippo de Pisis, 24, 44100 Ferrara, Italy
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  • ELENA PECCHIOLI,

    1. Fondazione E. Mach, Research and Innovation Centre, Department of Biodiversity and Molecular Ecology, Via E. Mach 1, S. Michele all'Adige, Trento, Italy
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  • CRISTIANO VERNESI,

    1. Fondazione E. Mach, Research and Innovation Centre, Department of Biodiversity and Molecular Ecology, Via E. Mach 1, S. Michele all'Adige, Trento, Italy
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  • HEIDI C. HAUFFE,

    1. Fondazione E. Mach, Research and Innovation Centre, Department of Biodiversity and Molecular Ecology, Via E. Mach 1, S. Michele all'Adige, Trento, Italy
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  • JEREMY B. SEARLE,

    1. Department of Ecology and Evolutionary Biology, Corson Hall, Cornell University, Ithaca, NY 14853-2701, USA
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  • JACQUES HAUSSER

    1. Department of Ecology and Evolution, Biophore Building, University of Lausanne, 1015 Lausanne, Switzerland
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E-mail: glenn.yannic@gmail.com

Abstract

The aim of the present study was to investigate the genetic structure of the Valais shrew (Sorex antinorii) by a combined phylogeographical and landscape genetic approach, and thereby to infer the locations of glacial refugia and establish the influence of geographical barriers. We sequenced part of the mitochondrial cytochrome b (cyt b) gene of 179 individuals of S. antinorii sampled across the entire species' range. Six specimens attributed to S. arunchi were included in the analysis. The phylogeographical pattern was assessed by Bayesian molecular phylogenetic reconstruction, population genetic analyses, and a species distribution modelling (SDM)-based hindcasting approach. We also used landscape genetics (including isolation-by-resistance) to infer the determinants of current intra-specific genetic structure. The phylogeographical analysis revealed shallow divergence among haplotypes and no clear substructure within S. antinorii. The starlike structure of the median-joining network is consistent with population expansion from a single refugium, probably located in the Apennines. Long branches observed on the same network also suggest that another refugium may have existed in the north-eastern part of Italy. This result is consistent with SDM, which also suggests several habitable areas for S. antinorii in the Italian peninsula during the LGM. Therefore S. antinorii appears to have occupied disconnected glacial refugia in the Italian peninsula, supporting previous data for other species showing multiple refugia within southern refugial areas. By coupling genetic analyses and SDM, we were able to infer how past climatic suitability contributed to genetic divergence of populations. The genetic differentiation shown in the present study does not support the specific status of S. arunchi. © 2012 The Linnean Society of London, Biological Journal of the Linnean Society, 2012, 105, 864–880.

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