Visual pigments, cone oil droplets and ocular media in four species of estrildid finch

@article{Hart2000VisualPC,
  title={Visual pigments, cone oil droplets and ocular media in four species of estrildid finch},
  author={Nathan S. Hart and Julian C. Partridge and Andrew T. D. Bennett and Innes C. Cuthill},
  journal={Journal of Comparative Physiology A},
  year={2000},
  volume={186},
  pages={681-694}
}
Abstract. A microspectrophotometric study was conducted on the retinal photoreceptors of four species of bird: cut-throat finches (Amadina fasciata), gouldian finches (Erythrura gouldiae), white-headed munias (Lonchura maja) and plum-headed finches (Neochmia modesta). Spectral characteristics of the photoreceptors in all four species were very similar. Rods contained a medium-wavelength-sensitive visual pigment with a wavelength of maximum absorbance at 502–504 nm. Four spectrally distinct… Expand
Microspectrophotometry of visual pigments and oil droplets in a marine bird, the wedge-tailed shearwater Puffinus pacificus: topographic variations in photoreceptor spectral characteristics
  • N. Hart
  • Biology, Medicine
  • Journal of Experimental Biology
  • 2004
TLDR
It is proposed that the reduction in cone oil droplet pigmentation in retinal areas associated with high visual acuity is an adaptation to compensate for the reduced photon capture ability of the narrower photoreceptors found there. Expand
Developmental changes in the cone visual pigments of black bream Acanthopagrus butcheri.
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The spectral absorption characteristics of the visual pigments in the photoreceptors of the black bream Acanthopagrus butcheri Munro were measured using microspectrophotometry and indicated that changes in lambda(max) were not mediated by a switch from an A(1) to A(2) chromophore, rather a change in opsin expression was most likely. Expand
Retinal characteristics of the ornate dragon lizard, Ctenophorus ornatus
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The retina of a diurnal insectivorous lizard was investigated using microspectrophotometry and light and electron microscopy and the presence of a fovea containing slender cone photoreceptors and three visual pigments suggests that the lizard has high acuity and the potential for color vision. Expand
Visual pigments in a palaeognath bird, the emu Dromaius novaehollandiae: implications for spectral sensitivity and the origin of ultraviolet vision
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Results show that the emu resembles most other bird species in possessing four spectrally distinct single cones, as well as double cones and rods, and suggests that UVS is the most likely ancestral state for birds. Expand
Vision in the peafowl (Aves: Pavo cristatus).
  • N. Hart
  • Biology, Medicine
  • The Journal of experimental biology
  • 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 spectralExpand
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It is reported that the spectral transmission of the cornea and lens of great black-backed Larus marinus and herring gulls L. argentatus allow UV-sensitivity, having a λT0.5 value, 344 nm, similar to the ocular media of UV sensitive birds. Expand
Absorbance of retinal oil droplets of the budgerigar: sex, spatial and plumage morph-related variation
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This work found a spatial pattern of droplets absorbance across the retina that matched a pattern found in another parrot, and other avian species, and suggests a common mechanism and function for carotenoid deposition in the retina across bird species. Expand
The Visual Ecology of Avian Photoreceptors
  • N. Hart
  • Medicine, Biology
  • Progress in Retinal and Eye Research
  • 2001
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The primary influence on avian retinal design appears to be the range of wavelengths available for vision, regardless of whether that range is determined by the spectral distribution of the natural illumination or the spectral transmittance of the ocular media. Expand
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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. Expand
Variation in ultraviolet reflectance by carotenoid-bearing feathers of tanagers (Thraupini: Emberizinae: Passeriformes)
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It is proposed that the strong absorption band at short visible wavelengthsresponsible for bimodal spectra of carotenoids in vitro is also responsible for bIModal reflectance byCarotenoid-based plumage colours. Expand
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