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Tetrachromacy, oil droplets and bird plumage colours
TLDR
This work examines the advantages of coloured oil droplets, UV vision and tetrachromacy for discriminating a diverse set of avian plumage spectra under natural illumination and finds that Discriminability is enhanced both by tetrACHromacy and coloured oil Droplets.
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.)
TLDR
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.
Plumage Reflectance and the Objective Assessment of Avian Sexual Dichromatism
TLDR
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.
Blue tits are ultraviolet tits
TLDR
Reflectance spectrophotometry reveals that blue tit plumage shows considerable reflection of UV light, and sexually dichromatic for multiple regions of plumage, including the crest, which has implications for both intra– and interspecific studies of sexual selection.
Ultraviolet vision and mate choice in zebra finches
TLDR
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.
Ultraviolet plumage colors predict mate preferences in starlings.
TLDR
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.
Sexual Selection and the Mismeasure of Color
TLDR
It is argued that the error in this assumption that birds see color patterns as humans do may well be a major reason that support for various evolutionary hypotheses involving color is an area of controversy, and suggests methods for overcoming the shortcomings of existing studies.
Visual pigments, cone oil droplets and ocular media in four species of estrildid finch
TLDR
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).
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