The genetic consequences of worker ant pollination in a self-compatible, clonal orchid

Rod Peakall, Andrew J. Beattie

    Research output: Contribution to journalArticlepeer-review

    87 Citations (Scopus)

    Abstract

    The self-compatible orchid Microtis parviflora is pollinated by the flightless worker caste of the ant Iridomyrmex gracilis. The orchid is clonal and forms small patches of disconnected individual ramets. Ant pollinators visited and revisited a limited proportion of available inflorescences; 40% of all flower visits occurred within plants promoting self-pollination. Self-pollination accounted for 51% of pollen transfers. Distribution of ant movements between plants was leptokurtic with a mean of 12.4±14.9cm and a maximum of 89cm, but a high proportion of movements were within clones accentuating the level of self-pollination. However, some pollen transfers between inflorescences of unlike genotypes contributed to a low incidence (max 8%) of outcrossing. In 12 patches examined by electrophoresis, the density varied from 11-61 inflorescences m-2 and a maximum of only four genotypes were detected. -from Authors

    Original languageEnglish
    Pages (from-to)1837-1848
    Number of pages12
    JournalEvolution
    Volume45
    Issue number8
    DOIs
    Publication statusPublished - Dec 1991

    Keywords

    • ant
    • ant foraging
    • ant pollination
    • clone
    • inbreeding
    • Iridomyrmex gracilis
    • Microtis praviflora
    • orchid
    • pollen flow
    • population
    • genetic structure

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