Naturwissenschaften

, 97:97

Colour mimicry and sexual deception by Tongue orchids (Cryptostylis)

SHORT COMMUNICATION

DOI: 10.1007/s00114-009-0611-0

Cite this article as:
Gaskett, A.C. & Herberstein, M.E. Naturwissenschaften (2010) 97: 97. doi:10.1007/s00114-009-0611-0

Abstract

Typically, floral colour attracts pollinators by advertising rewards such as nectar, but how does colour function when pollinators are deceived, unrewarded, and may even suffer fitness costs? Sexually deceptive orchids are pollinated only by male insects fooled into mating with orchid flowers and inadvertently transferring orchid pollinia. Over long distances, sexually deceptive orchids lure pollinators with counterfeit insect sex pheromones, but close-range deception with colour mimicry is a tantalising possibility. Here, for the first time, we analyse the colours of four sexually deceptive Cryptostylis orchid species and the female wasp they mimic (Lissopimpla excelsa, Ichneumonidae), from the perspective of the orchids’ single, shared pollinator, male Lissopimpla excelsa. Despite appearing different to humans, the colours of the orchids and female wasps were effectively identical when mapped into a hymenopteran hexagonal colour space. The orchids and wasps reflected predominantly red-orange wavelengths, but UV was also reflected by raised bumps on two orchid species and by female wasp wings. The orchids’ bright yellow pollinia contrasted significantly with their overall red colour. Orchid deception may therefore involve accurate and species-specific mimicry of wavelengths reflected by female wasps, and potentially, exploitation of insects’ innate attraction to UV and yellow wavelengths. In general, mimicry may be facilitated by exploiting visual vulnerabilities and evolve more readily at the peripheries of sensory perception. Many sexually deceptive orchids are predominantly red, green or white: colours that are all potentially difficult for hymenoptera to detect or distinguish from the background.

Keywords

Floral colour Pollination Insect vision Cryptostylis Lissopimpla excelsa 

Supplementary material

114_2009_611_MOESM1_ESM.doc (602 kb)
Online resource 1(DOC 602 kb)
114_2009_611_MOESM2_ESM.doc (1.1 mb)
Online resource 2(DOC 1170 kb)
114_2009_611_MOESM3_ESM.doc (54 kb)
Online resource 3(DOC 55 kb)
114_2009_611_MOESM4_ESM.doc (34 kb)
Online resource 4(DOC 34 kb)

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Department Biological SciencesMacquarie UniversitySydneyAustralia
  2. 2.School of Biological SciencesUniversity of AucklandAucklandNew Zealand
  3. 3.Department Neurobiology and BehaviorCornell UniversityIthacaUSA

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