Phylogeography of a host-specific insect: genetic structure of Ips typographus in Europe does not reflect past fragmentation of its host

Authors

  • A. SALLÉ,

    1. INRA, Zoologie Forestière, BP 20619 Ardon, F-45166 Olivet cedex, France
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    • Current address: Institut des Sciences de l’Evolution, Université Montpellier 2, Place Eugène Bataillon, F-34095 Montpellier cedex 05, France

  • W. ARTHOFER,

    1. Institute of Forest Entomology, Forest Pathology and Forest Protection, Department of Forest and Soil Sciences, Boku, University of Natural Resources and Applied Life Sciences, Vienna, 1190-Austria
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  • F. LIEUTIER,

    1. Université d’Orléans, Laboratoire de Biologie des Ligneux et des Grandes Cultures, BP 6759, F-45067 Orléans cedex 2, France
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  • C. STAUFFER,

    1. Institute of Forest Entomology, Forest Pathology and Forest Protection, Department of Forest and Soil Sciences, Boku, University of Natural Resources and Applied Life Sciences, Vienna, 1190-Austria
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  • C. KERDELHUÉ

    Corresponding author
    1. INRA Centre de Pierroton, UMR BIOGECO, Entomologie et Biodiversité, 69 route d’Arcachon, F-33612 Cestas cedex, France
      E-mail: carole.kerdelhue@pierroton.inra.fr.
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E-mail: carole.kerdelhue@pierroton.inra.fr.

Abstract

The phylogeography of the bark beetle Ips typographus was assessed using five microsatellite markers. Twenty-eight populations were sampled throughout Europe on the host tree Picea abies. I. typographus showed very low levels of genetic diversity, and the study revealed a lack of genetic structure across Europe. No significant barrier to gene flow was found, even though P. abies has a fragmented distribution. A weak but significant effect of isolation by distance was found. These results suggest a high dispersal capacity of I. typographus, which leads to low genetic differentiation between populations. Its high dispersal capacity is likely to have prevented I. typographus from developing important local adaptations to its host, which would have influenced its genetic structure. The nuclear data was compared to previously published mitochondrial data that showed strong differentiation between Central–Northern European populations and Russian–Baltic populations, and a founder effect in Scandinavia, probably reflecting the postglacial history of I. typographus. Discrepancies between nuclear and mitochondrial markers could be due to the maternal inheritance of mitochondrial DNA, and to sex-biased dispersal in I. typographus. The overall low genetic diversity observed on both markers on a large geographical scale is discussed. © 2007 The Linnean Society of London, Biological Journal of the Linnean Society, 2007, 90, 239–246.

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