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    Ecological factors driving pollination success in an orchid that mimics a range of Fabaceae

    Access Status
    Fulltext not available
    Authors
    Scaccabarozzi, Daniela
    Guzzetti, L.
    Phillips, R.
    Milne, Lynne
    Tommasi, N.
    Cozzolino, S.
    Dixon, Kingsley
    Date
    2020
    Type
    Journal Article
    
    Metadata
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    Citation
    Scaccabarozzi, D. Guzzetti, L. Phillips, R. Milne, L. Tommasi, N. Cozzolino, S. Dixon, K. 2020. Ecological factors driving pollination success in an orchid that mimics a range of Fabaceae. Botanical Journal of the Linnean Society. 194 (2): pp. 253–269.
    Source Title
    Botanical Journal of the Linnean Society
    DOI
    10.1093/botlinnean/boaa039
    ISSN
    0024-4074
    Faculty
    Faculty of Science and Engineering
    School
    School of Molecular and Life Sciences (MLS)
    URI
    http://hdl.handle.net/20.500.11937/81259
    Collection
    • Curtin Research Publications
    Abstract

    Rewarding plants can enhance the pollination success of co-occurring plants pollinated by food mimicry. However, it is not always possible to readily discern between the effect of model and magnet species. Here, we tested for mimicry of co-occurring Fabaceae by the rewardless Diuris magnifica (Orchidaceae) and whether the number of flowers of Fabaceae, habitat remnant size and frequency of conspecifics, influenced the pollination success of D. magnifica. Trichocolletes bees were the primary pollinators of D. magnifica, on which they displayed similar behaviour as seen when feeding on Fabaceae. Quantification of spectral reflectance suggested that flowers of Bossiaea eriocarpa, Daviesia divaricata and Jacksonia sternbergiana may represent models for D. magnifica, whereas Hardenbergia comptoniana strongly differed in colour. Orchid pollination success was not directly affected by the number of model flowers, but the pollination rate was enhanced by increased numbers of Hardenbergia flowers. Pollination success of the orchid decreased with higher density of conspecifics, but did not exhibit a significant relationship with Trichocolletes occurrence, possibly because of the contribution of sub-optimal pollinator species. Fruit set of the orchid was greater in larger habitat remnants. Overall, pollination success of D. magnifica is affected by ecological factors related to the effectiveness of mimicry, numbers of co-flowering plants and anthropogenic landscape alteration.

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