Evolution of colour vision in mammals. Jacobs, G. H. Philosophical Transactions of the Royal Society of London B: Biological Sciences, 364(1531):2957–2967, The Royal Society, 2009.
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Colour vision allows animals to reliably distinguish differences in the distributions of spectral energies reaching the eye. Although not universal, a capacity for colour vision is sufficiently widespread across the animal kingdom to provide prima facie evidence of its importance as a tool for analysing and interpreting the visual environment. The basic biological mechanisms on which vertebrate colour vision ultimately rests, the cone opsin genes and the photopigments they specify, are highly conserved. Within that constraint, however, the utilization of these basic elements varies in striking ways in that they appear, disappear and emerge in altered form during the course of evolution. These changes, along with other alterations in the visual system, have led to profound variations in the nature and salience of colour vision among the vertebrates. This article concerns the evolution of colour vision among the mammals, viewing that process in the context of relevant biological mechanisms, of variations in mammalian colour vision, and of the utility of colour vision.
@ARTICLE{Jacobs2009,
  author = {Jacobs, Gerald H.},
  title = {Evolution of colour vision in mammals},
  journal = {Philosophical Transactions of the Royal Society of London B: Biological
	Sciences},
  year = {2009},
  volume = {364},
  pages = {2957--2967},
  number = {1531},
  abstract = {Colour vision allows animals to reliably distinguish differences in
	the distributions of spectral energies reaching the eye. Although
	not universal, a capacity for colour vision is sufficiently widespread
	across the animal kingdom to provide prima facie evidence of its
	importance as a tool for analysing and interpreting the visual environment.
	The basic biological mechanisms on which vertebrate colour vision
	ultimately rests, the cone opsin genes and the photopigments they
	specify, are highly conserved. Within that constraint, however, the
	utilization of these basic elements varies in striking ways in that
	they appear, disappear and emerge in altered form during the course
	of evolution. These changes, along with other alterations in the
	visual system, have led to profound variations in the nature and
	salience of colour vision among the vertebrates. This article concerns
	the evolution of colour vision among the mammals, viewing that process
	in the context of relevant biological mechanisms, of variations in
	mammalian colour vision, and of the utility of colour vision.},
  doi = {10.1098/rstb.2009.0039},
  publisher = {The Royal Society}
}

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