Floral Iridescence, Produced by Diffractive Optics, Acts As a Cue for Animal Pollinators

H.M Whitney, M Kolle, P Andrew, L Chittka, U Steiner, B.J. Glover

Research output: Contribution to journalArticle (Academic Journal)peer-review

322 Citations (Scopus)


Iridescence, the change in hue of a surface with varying observation angles, is used by insects, birds, fish, and reptiles for species recognition and mate selection. We identified iridescence in flowers of Hibiscus trionum and Tulipa species and demonstrated that iridescence is generated through diffraction gratings that might be widespread among flowering plants. Although iridescence might be expected to increase attractiveness, it might also compromise target identification because the object's appearance will vary depending on the viewer's perspective. We found that bumblebees (Bombus terrestris) learn to disentangle flower iridescence from color and correctly identify iridescent flowers despite their continuously changing appearance. This ability is retained in the absence of cues from polarized light or ultraviolet reflectance associated with diffraction gratings.
Translated title of the contributionFloral iridescence, produced by diffractive optics, acts as a cue for animal pollinators
Original languageEnglish
Pages (from-to)130 - 133
Number of pages4
Issue number5910
Publication statusPublished - Jan 2009


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