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Visual pigments, oil droplets, ocular media and cone photoreceptor distribution in two species of passerine bird: the blue tit (Parus caeruleus L.) and the blackbird (Turdus merula L.)
The spectral absorption characteristics of the retinal photoreceptors of the blue tit and blackbird were investigated using microspectrophotometry, raising the possibility that the precise λmax of the long-wavelength-sensitive visual pigment is optimised for the visual function of the double cones.
Using digital photography to study animal coloration
These guidelines include how to linearize the camera's response to changes in light intensity, equalize the different colour channels to obtain reflectance information, and produce a mapping from camera colour space to that of another colour space (such as photon catches for the cone types of a specific animal species).
Plumage Reflectance and the Objective Assessment of Avian Sexual Dichromatism
This study revealed previously unnoticed sex differences in plumage coloration and the nature of iridescent and noniridescent sex differences, which has important implications for classifications of animals as mono‐ or dimorphic and for taxonomic and conservation purposes.
Ultraviolet Vision in Birds
The molecular basis for spectral tuning of rod visual pigments in deep-sea fish.
- D. Hunt, K. Dulai, J. Partridge, P. Cottrill, J. Bowmaker
- BiologyThe Journal of experimental biology
- 1 October 2001
In this study, the rod opsin gene sequences from 28 deep-sea fish species drawn from seven different Orders are compared and a phylogenetic analysis predicts that the pigment in the ancestral species would have had a lambda(max) of approximately 480 nm.
Ultraviolet plumage colors predict mate preferences in starlings.
- A. Bennett, I. Cuthill, J. Partridge, K. Lunau
- BiologyProceedings of the National Academy of Sciences…
- 5 August 1997
It is shown that female starlings rank males differently when UV wavelengths are present or absent, and plumage reflectance in the human visible spectrum did not predict choice under UV- conditions.
Ultraviolet vision and mate choice in zebra finches
It is found that the ultraviolet is used, and that it probably contributes to hue perception in avian mate-choice decisions, and supports one hypothesized function of avian ultraviolet vision.
Visual pigments, cone oil droplets and ocular media in four species of estrildid finch
A microspectrophotometric study was conducted on the retinal photoreceptors of four species of bird: cut-throat finches, gouldian finches (Erythrura gouldiae), white-headed munias (Lonchura maja) and plum-headedfinches (Neochmia modesta).
Vision in lanternfish (Myctophidae): adaptations for viewing bioluminescence in the deep sea
Visual Pigments, Ocular Filters and the Evolution of Snake Vision.
Positive selection was inferred at multiple sites in all three opsins, these being concentrated in transmembrane domains and thus likely to have a substantial effect on spectral tuning and other aspects of opsin function.