Implications of pollination by food and sexual deception for pollinator specificity, fruit set, population genetics and conservation of Caladenia (Orchidaceae)

Ryan D. Phillips; Renate Faast; Colin C. Bower; Graham R. Brown; Rod Peakall

doi:10.1071/BT08154

RESEARCH ARTICLE

Previous Next Contents Vol 57(4)

Implications of pollination by food and sexual deception for pollinator specificity, fruit set, population genetics and conservation of Caladenia (Orchidaceae)

Ryan D. Phillips ^A ^B ^G , Renate Faast ^C , Colin C. Bower ^D , Graham R. Brown ^E and Rod Peakall ^F

+ Author Affiliations

- Author Affiliations

^A Kings Park and Botanic Gardens, The Botanic Gardens and Parks Authority, West Perth, WA 6005, Australia.

^B School of Plant Biology, The University of Western Australia, Crawley, WA 6009, Australia.

^C School of Earth and Environmental Sciences, The University of Adelaide, Adelaide, SA 5005, Australia.

^D Florasearch, PO Box 300, Orange, NSW 2800, Australia.

^E Museum and Art Gallery of the Northern Territory, GPO Box 4646, Darwin, NT 0801, Australia.

^F School of Botany and Zoology, The Australian National University, Canberra, ACT 0200, Australia.

^G Corresponding author. Email: Ryan.Phillips@bgpa.wa.gov.au

Australian Journal of Botany 57(4) 287-306 https://doi.org/10.1071/BT08154
Submitted: 17 August 2008 Accepted: 3 February 2009 Published: 29 July 2009

Abstract

Caladenia is very unusual in that it contains species that attract pollinators by two different strategies, food and sexual deception. Among the sexually deceptive species, baiting for pollinators has shown that within populations orchid species are typically pollinated by a single species of thynnine wasp. However, some wasp species can be pollinators of more than one species of orchid usually when their ranges do not overlap. There is a trend for closely related orchids to exploit wasps from the same genus, with different lineages of orchids often pollinated by different genera. Very little is known about pollination of food-deceptive Caladenia species, although it is evident they attract a suite of generalist food-seeking insects. Food-deceptive species have a higher pollination rate than do sexually deceptive species. Studies of population genetics and pollen movements are few, although they suggest a pattern of fine-scale genetic structuring within populations, owing to predominantly restricted seed dispersal and low genetic differentiation among populations as a consequence of rare long-distance seed-dispersal events. Both evolutionary and ecological research of Caladenia will greatly benefit from a better understanding of the insect species involved in pollination, their ecological requirements and the ecological and genetic consequences of food and sexual deception.

Acknowledgements

R. D. Phillips was supported by an Australian Postgraduate Award. Fieldwork by R. D. Phillips was undertaken with financial support of the Australian Orchid Foundation, the Holsworth Wildlife Research Endowment and the School of Plant Biology at the University of Western Australia. Thanks go to Jon See, Nigel Swarts and Eric Chapman for assistance with fieldwork and Andrew Brown, Kingsley Dixon and Steve Hopper for their advice and encouragement. R. Faast was supported by a Faculty of Sciences Divisional Scholarship from The University of Adelaide and an Australian Research Council Linkage Project grant (LP 0560578) with the Department for Environment and Heritage SA, the South Australian Museum, Foundation for Australia’s Most Endangered Species and Biocity Centre for Urban Habitats, University of Adelaide. Thanks go to José Facelli and Andrew Austin for advice and guidance. C. C. Bower received financial support for field studies from the Australian Orchid Foundation. R. Peakall was supported by an Australian Research Council (ARC) Discovery Project grant (DP0451374) and the Australian National University.

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Implications of pollination by food and sexual deception for pollinator specificity, fruit set, population genetics and conservation of Caladenia (Orchidaceae)

Abstract

Acknowledgements

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