Three spectrally distinct photoreceptors in diurnal and nocturnal Australian ants

Yuri Ogawa*, Marcin Falkowski, Ajay Narendra, Jochen Zeil, Jan M. Hemmi

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    Ants are thought to be special among Hymenopterans in having only dichromatic colour vision based on two spectrally distinct photoreceptors. Many ants are highly visual animals, however, and use vision extensively for navigation. We show here that two congeneric day- and night-active Australian ants have three spectrally distinct photoreceptor types, potentially supporting trichromatic colour vision. Electroretinogram recordings show the presence of three spectral sensitivities with peaks (λmax) at 370, 450 and 550 nm in the night-active Myrmecia vindex and peaks at 370, 470 and 510 nm in the day-active Myrmecia croslandi. Intracellular electrophysiology on individual photoreceptors confirmed that the night-active M. vindex has three spectral sensitivities with peaks (λmax) at 370, 430 and 550 nm. A large number of the intracellular recordings in the night-active M. vindex show unusually broad-band spectral sensitivities, suggesting that photoreceptors may be coupled. Spectral measurements at different temporal frequencies revealed that the ultraviolet receptors are comparatively slow.We discuss the adaptive significance and the probability of trichromacy in Myrmecia ants in the context of dim light vision and visual navigation.

    Original languageEnglish
    Article number20150673
    Pages (from-to)1-7
    Number of pages7
    JournalProceedings of the Royal Society B: Biological Sciences
    Volume282
    Issue number1808
    DOIs
    Publication statusPublished - 7 Jun 2015

    Keywords

    • colour vision
    • navigation
    • spectral sensitivity
    • photoreceptors
    • ants

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