Photoreceptor spectral tuning by colorful, multilayered facet lenses in long-legged fly eyes (Dolichopodidae)

D. G. Stavenga*, A. Meglic, P. Pirih, H. Koshitaka, K. Arikawa, M. F. Wehling, G. Belusic

*Bijbehorende auteur voor dit werk

    OnderzoeksoutputAcademicpeer review

    9 Citaten (Scopus)
    108 Downloads (Pure)

    Samenvatting

    The facet lenses of the compound eyes of long-legged flies (Dolichopodidae) feature a striking, interlaced coloration pattern, existing of alternating rows of green-yellow and orange-red reflecting facets, due to dielectric multilayers located distally in the facet lenses (Bernard and Miller. Invest Ophthalmol 7:416-434 (1968). We investigated this phenomenon in the dolichopodid Dolichopus nitidus by applying microspectrophotometry, electron microscopy and optical modeling. The measured narrow-band reflectance spectra, peaking at similar to 540 and similar to 590 nm with bandwidth similar to 105 nm, are well explained by a refractive index oscillating sinusoidally in six periods around a mean value of about 1.44 with amplitude 0.6. The facet lens reflectance spectra are associated with a spectrally restricted, reduced transmittance, which causes modified spectral sensitivities of the underlying photoreceptors. Based on the modeling and electroretinography of the dolichopodid Condylostylus japonicus we conjecture that the green and orange facets narrow the spectral bandwidths of blue and green central photoreceptors, respectively, thus possibly improving color and/or polarization vision.

    Originele taal-2English
    Pagina's (van-tot)23-33
    Aantal pagina's11
    TijdschriftJournal of comparative physiology a-Neuroethology sensory neural and behavioral physiology
    Volume203
    Nummer van het tijdschrift1
    DOI's
    StatusPublished - jan.-2017

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