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Color discrimination in the red range with only one long-wavelength sensitive opsin

Författare:
Publiceringsår: 2006
Språk: Engelska
Sidor: 1944-1955
Publikation/Tidskrift/Serie: Journal of Experimental Biology
Volym: 209
Nummer: 10
Dokumenttyp: Artikel
Förlag: Company of Biologists Ltd

Sammanfattning

The basic precondition for color vision is the presence of at least two receptor types with different spectral sensitivities. The sensitivity of a receptor is mostly defined by the opsin-based visual pigment expressed in it. We show here, through behavioral experiments, that the nymphalid butterfly Heliconius erato, although it expresses short and medium wavelength opsins and only one long wavelength opsin, discriminates colors in the long-wavelength range (590 nm, 620 nm and 640 nm), whereas another nymphalid, Vanessa atalanta, despite having color vision, is unable to do so. In the eyes of H. erato we identified filtering pigments very close to the rhabdom which differ between ommatidia and produce the yellow and red ommatidial reflection seen under orthodromic illumination. The eyes of V. atalanta lack the filtering pigments, and reflect a homogeneous orange. We hypothesize that the filtering pigments found in the eyes of H. erato may shift the spectral sensitivity peak of the long wavelength receptors in some ommatidia towards longer wavelengths. The comparison of the signals between the two new receptor types makes color discrimination in the red range possible. To our knowledge, this is the first behavioral proof of color vision based on receptors expressing the same opsin.

Disputation

Nyckelord

  • Biology and Life Sciences
  • color vision
  • butterfly
  • Heliconius erato
  • filter pigment
  • insect
  • opsin

Övriga

Published
Yes
  • Lund Vision Group
  • ISSN: 0022-0949

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