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    Does a shift in host plants trigger speciation in the Alpine leaf beetle Oreina speciosissima (Coleoptera, Chrysomelidae)?

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    Author
    Borer, Matthias
    van Noort, Tom
    Arrigo, Nils
    Buerki, Sven
    Alvarez, Nadir
    Affiliation
    Museum of Natural History Neuchâtel, Rue des Terreaux 14, 2000 Neuchâtel, Switzerland
    Laboratory of Evolutionary Entomology, Institute of Biology, University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland
    Department of Ecology & Evolutionary Biology, University of Arizona, Tucson, AZ, 85721, USA
    Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3DS, UK
    Department of Ecology and Evolution, University of Lausanne, Biophore Building, 1015 Lausanne, Switzerland
    Issue Date
    2011
    
    Metadata
    Show full item record
    Publisher
    BioMed Central
    Citation
    Borer et al. BMC Evolutionary Biology 2011, 11:310 http://www.biomedcentral.com/1471-2148/11/310
    Journal
    BMC Evolutionary Biology
    Rights
    © 2011 Borer et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0)
    Collection Information
    This item is part of the UA Faculty Publications collection. For more information this item or other items in the UA Campus Repository, contact the University of Arizona Libraries at repository@u.library.arizona.edu.
    Abstract
    BACKGROUND:Within the Coleoptera, the largest order in the animal kingdom, the exclusively herbivorous Chrysomelidae are recognized as one of the most species rich beetle families. The evolutionary processes that have fueled radiation into the more than thirty-five thousand currently recognized leaf beetle species remain partly unresolved. The prominent role of leaf beetles in the insect world, their omnipresence across all terrestrial biomes and their economic importance as common agricultural pest organisms make this family particularly interesting for studying the mechanisms that drive diversification. Here we specifically focus on two ecotypes of the alpine leaf beetle Oreina speciosissima (Scop.), which have been shown to exhibit morphological differences in male genitalia roughly corresponding to the subspecies Oreina speciosissima sensu stricto and Oreina speciosissima troglodytes. In general the two ecotypes segregate along an elevation gradient and by host plants: Oreina speciosissima sensu stricto colonizes high forb vegetation at low altitude and Oreina speciosissima troglodytes is found in stone run vegetation at higher elevations. Both host plants and leaf beetles have a patchy geographical distribution. Through use of gene sequencing and genome fingerprinting (AFLP) we analyzed the genetic structure and habitat use of Oreina speciosissima populations from the Swiss Alps to examine whether the two ecotypes have a genetic basis. By investigating a wide range of altitudes and focusing on the structuring effect of habitat types, we aim to provide answers regarding the factors that drive adaptive radiation in this phytophagous leaf beetle.RESULTS:While little phylogenetic resolution was observed based on the sequencing of four DNA regions, the topology and clustering resulting from AFLP genotyping grouped specimens according to their habitat, mostly defined by plant associations. A few specimens with intermediate morphologies clustered with one of the two ecotypes or formed separate clusters consistent with habitat differences. These results were discussed in an ecological speciation framework.CONCLUSIONS:The question of whether this case of ecological differentiation occurred in sympatry or allopatry remains open. Still, the observed pattern points towards ongoing divergence between the two ecotypes which is likely driven by a recent shift in host plant use.
    EISSN
    1471-2148
    DOI
    10.1186/1471-2148-11-310
    Version
    Final published version
    Additional Links
    http://www.biomedcentral.com/1471-2148/11/310
    ae974a485f413a2113503eed53cd6c53
    10.1186/1471-2148-11-310
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