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Two orchids attract different pollinators with the same floral odour compound: ecological and evolutionary implications

Schiestl, Florian; Peakall, Rodney

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1. The sexually deceptive orchids Chiloglottis trapeziformis Fitzg. and Chiloglottis valida D.L. Jones are pollinated by the thynnine wasps Neozeleboria cryptoides (Smith) and Neozeleboria monticola Turner, respectively, during attempted mating with the flower labellum. The orchids and their pollinators occur mostly in allopatry; however on the overlapping edges of their ranges they can attract each other's pollinator, leading to rare hybrids. 2. Using gas chromatographic analyses with...[Show more]

dc.contributor.authorSchiestl, Florian
dc.contributor.authorPeakall, Rodney
dc.date.accessioned2015-12-13T22:45:17Z
dc.identifier.issn0269-8463
dc.identifier.urihttp://hdl.handle.net/1885/79691
dc.description.abstract1. The sexually deceptive orchids Chiloglottis trapeziformis Fitzg. and Chiloglottis valida D.L. Jones are pollinated by the thynnine wasps Neozeleboria cryptoides (Smith) and Neozeleboria monticola Turner, respectively, during attempted mating with the flower labellum. The orchids and their pollinators occur mostly in allopatry; however on the overlapping edges of their ranges they can attract each other's pollinator, leading to rare hybrids. 2. Using gas chromatographic analyses with electroantennographic detection (GC-EAD) we demonstrate that 2-ethyl-5-propyl-1,3-cyclohexandione ('Chiloglottone'), the previously known sex pheromone of N. cryptoides and pollinator-attractant of C. trapeziformis, is also used by C. valida to attract its pollinator N. monticola. 3. In behavioural field experiments, equal numbers of males of both species responded to, and attempted copulation with, a dummy scented with synthetic Chiloglottone. In dualchoice experiments where dummies were presented at different heights, N. cryptoides males preferentially attempted copulation with dummies a few centimetres above the ground, while N. monticola males significantly more often landed on the soil and attempted copulation with dummies on the soil. 4. These behavioural differences corresponded with differences in floral height in the orchids, C. trapeziformis being about twice as tall as C. valida. We suggest that this contrasting pollinator behaviour imposes selection for floral height in the orchids.
dc.publisherBlackwell Publishing Ltd
dc.sourceFunctional Ecology
dc.subjectKeywords: height; mating behavior; odor; pollination; pollinator; sex pheromone; Chiloglottis trapeziformis; Chiloglottis valida; Neozeleboria cryptoides; Neozeleboria monticola; Orchidaceae Mating behaviour; Orchid pollination; Pollinator behaviour; Sexual deception; Thynnine wasp
dc.titleTwo orchids attract different pollinators with the same floral odour compound: ecological and evolutionary implications
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume19
dc.date.issued2005
local.identifier.absfor060311 - Speciation and Extinction
local.identifier.ariespublicationMigratedxPub8083
local.type.statusPublished Version
local.contributor.affiliationSchiestl, Florian, Swiss Federal Institute of Technology (ETH)
local.contributor.affiliationPeakall, Rodney, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage674
local.bibliographicCitation.lastpage680
local.identifier.doi10.1111/j.1365-2435.2005.01010.x
dc.date.updated2015-12-11T10:20:45Z
local.identifier.scopusID2-s2.0-29144479403
CollectionsANU Research Publications

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