• Publications
  • Influence
The Visual Ecology of Avian Photoreceptors
  • N. Hart
  • Biology
    Progress in Retinal and Eye Research
  • 1 September 2001
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.
Variations in cone photoreceptor abundance and the visual ecology of birds
  • N. Hart
  • Biology, Environmental Science
    Journal of Comparative Physiology A
  • 2001
TLDR
The relative abundance and topographical distribution of retinal cone photoreceptors was measured in 19 bird species to identify possible correlations between photoreceptor complement and visual ecology and produced clusters that tended to reflect phylogenetic relatedness between species rather than similarities in their visual ecology.
Vision in the peafowl (Aves: Pavo cristatus).
  • N. Hart
  • Biology
    The Journal of experimental biology
  • 15 December 2002
The visual sense of the Indian blue-shouldered peafowl Pavo cristatus was investigated with respect to the spectral absorption characteristics of the retinal photoreceptors, the spectral
Avian Visual Pigments: Characteristics, Spectral Tuning, and Evolution
TLDR
In birds, UVS visual pigments have re‐evolved from an ancestral avian VS pigment by using a novel molecular mechanism not seen in other vertebrate classes, which has occurred independently in four of the 14 avian orders examined to date.
Modelling oil droplet absorption spectra and spectral sensitivities of bird cone photoreceptors
TLDR
It is shown that the spectral locations of the wavelengths of maximum absorbance of the short- (SWS), medium- (MWS) and long- (LWS) wavelength-sensitive visual pigments and the cut-off wavelengths of their respective C-, Y- and R-type oil droplets can be predicted from the λmax of the ultraviolet- (UVS)/violet- (VS) visual pigment.
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).
Red fluorescence in reef fish: A novel signalling mechanism?
TLDR
Red fluorescence is widespread among marine fishes and many features indicate that it is used as a private communication mechanism in small, benthic, pair- or group-living fishes, many of these species show quite cryptic colouration in other parts of the visible spectrum.
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