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Bowmaker, J. K. & Loew, E. R. (2005) The cone photoreceptors and visual pigments of chameleons. Journal of Comparative Physiology A, 191 925–932. 
Added by: Sarina (16 Dec 2008 20:27:07 UTC)   Last edited by: Sarina (22 Sep 2010 14:26:59 UTC)
Resource type: Journal Article
DOI: 10.1007/s00359-005-0014-4
BibTeX citation key: Bowmaker2005
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Categories: Englisch = English
Keywords: Echsen = Lizards, Farbsehen = Color Vision, Netzhaut = Retina, Sehvermögen = Visual Perception
Creators: Bowmaker, Loew
Collection: Journal of Comparative Physiology A
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Visual pigments, oil droplets and photoreceptor types in the retinas of four species of true chameleons have been examined by microspectrophotometry. The species occupy different photic environments: two species of Chamaeleo are from Madagascar and two species of Furcifer are from Africa and the Arabian Peninsula. In addition to double cones, four spectrally distinct classes of single cone were identified. No rod photoreceptors were observed. The visual pigments appear to be mixtures of rhodopsins and porphyropsins. Double cones contained a pale oil droplet in the principle member and both outer segments contained a long-wave-sensitive visual pigment with a spectral maximum between about 555 nm and 610 nm, depending on the rhodopsin/porphyropsin mixture. Long-wave-sensitive single cones contained a visual pigment spectrally identical to the double cones, but combined with a yellow oil droplet. The other three classes of single cone contained visual pigments with maxima at about 480–505, 440–450 and 375–385 nm, combined with yellow, clear and transparent oil droplets respectively. The latter two classes were sparsely distributed. The transmission of the lens and cornea of C. dilepis was measured and found to be transparent throughout the visible and near ultraviolet, with a cut off at about 350 nm.

Keywords Visual pigment - Photoreceptor - Oil droplet - Chameleon - Colour vision
Added by: Sarina  Last edited by: Sarina
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