Ultraviolet-sensitive vision in long-lived birds

Carvalho, Livia S., Knott, Ben, Berg, Mathew L., Bennett, Andrew T. D. and Hunt, David M. 2011, Ultraviolet-sensitive vision in long-lived birds, Royal Society of London. Proceedings B. Biological Sciences, vol. 278, no. 1702, pp. 107-114.

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Title Ultraviolet-sensitive vision in long-lived birds
Author(s) Carvalho, Livia S.
Knott, Ben
Berg, Mathew L.
Bennett, Andrew T. D.
Hunt, David M.
Journal name Royal Society of London. Proceedings B. Biological Sciences
Volume number 278
Issue number 1702
Start page 107
End page 114
Publisher The Royal Society
Place of publication London, England
Publication date 2011-01-07
ISSN 0962-8452
Keyword(s) Visual pigments
Ultraviolet
Photodamage
Spectral tuning
SWS1 opsin
Parrots
Summary Long-term exposure to ultraviolet (UV) light generates substantial damage, and in mammals, visual sensitivity to UV is restricted to short-lived diurnal rodents and certain marsupials. In humans, the cornea and lens absorb all UV-A and most of the terrestrial UV-B radiation, preventing the reactive and damaging shorter wavelengths from reaching the retina. This is not the case in certain species of long-lived diurnal birds, which possess UV-sensitive (UVS) visual pigments, maximally sensitive below 400 nm. The Order Psittaciformes contains some of the longest lived bird species, and the two species examined so far have been shown to possess UVS pigments. The objective of this study was to investigate the prevalence of UVS pigments across long-lived parrots, macaws and cockatoos, and therefore assess whether they need to cope with the accumulated effects of exposure to UV-A and UV-B over a long period of time. Sequences from the SWS1 opsin gene revealed that all 14 species investigated possess a key substitution that has been shown to determine a UVS pigment. Furthermore, in vitro regeneration data, and lens transparency, corroborate the molecular findings of UV sensitivity. Our findings thus support the claim that the Psittaciformes are the only avian Order in which UVS pigments are ubiquitous, and indicate that these long-lived birds have UV sensitivity, despite the risks of photodamage.
Language eng
Field of Research 060399 Evolutionary Biology not elsewhere classified
Socio Economic Objective 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2010, The Royal Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30032261

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