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    Ecological and genetic evidence for cryptic ecotypes in a rare sexually deceptive orchid, Drakaea elastica

    Access Status
    Open access via publisher
    Authors
    Menz, M.
    Philips, R.
    Anthony, J.
    Bohman, B.
    Dixon, Kingsley
    Peakall, R.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Menz, M. and Philips, R. and Anthony, J. and Bohman, B. and Dixon, K. and Peakall, R. 2015. Ecological and genetic evidence for cryptic ecotypes in a rare sexually deceptive orchid, Drakaea elastica. Botanical Journal of the Linnean Society. 177 (1): pp. 124-140.
    Source Title
    Botanical Journal of the Linnean Society
    DOI
    10.1111/boj.12230
    ISSN
    0024-4074
    URI
    http://hdl.handle.net/20.500.11937/18572
    Collection
    • Curtin Research Publications
    Abstract

    Species with specialized ecological interactions present significant conservation challenges. In plants that attract pollinators with pollinator-specific chemical signals, geographical variation in pollinator species may indicate the presence of cryptic plant taxa. We investigated this phenomenon in the rare sexually deceptive orchid Drakaea elastica using a molecular phylogenetic analysis to resolve pollinator species boundaries, pollinator choice experiments and a population genetic study of the orchid. Pollinator choice experiments demonstrated the existence of two ecotypes within D. elastica, each attracting their own related but phylogenetically distinct pollinator species. Despite the presence of ecotypes, population genetic differentiation was low across populations at six microsatellite loci (FST = 0.026). However, Bayesian STRUCTURE analysis revealed two genetic clusters, broadly congruent with the ecotype distributions. These ecotypes may represent adaptation to regional variation in pollinator availability and perhaps the early stages of speciation, with pronounced morphological and genetic differences yet to evolve. Resolution of the taxonomic status of the D. elastica ecotypes is required as this has implications for conservation efforts and allocation of management funding. Furthermore, any reintroduction programmes must incorporate knowledge of ecotype distribution and pollinator availability to ensure reproductive success in restored populations.

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