Restricted range in ocular accommodation in barn owls (Aves:Tytonidae)
Howland, Howard C., Howland, M. J., Schmid, Katrina L., & Pettigrew, Jack D. (1990) Restricted range in ocular accommodation in barn owls (Aves:Tytonidae). Journal of Comparative Physiology A: sensory, neural, and behavioral physiology, 168, pp. 299-303.
In an examination of the focusing abilities of 15 species of owls, the North American barn owl, Tyto alba pratincola (Bonaparte 1838), was an outstanding accommodator, having a range of accommodation exceeding 10 diopters (Murphy and Howland 1983). Using comparable methods, we examined the accommodation of 4 species of the Australian barn owl, Tyto alba delicatula (Gould 1837). We failed to elicit accommodation greater than two diopters, and most stimuli failed to evoke any discernable accommodation at all. Furthermore, examination of other Australian tytonid owls, the grass owl, T. longimembris, the sooty owl, T. tenebricosa, and both the mainland and Tasmanian sub-species of the masked owl, T. novaehollandiae novaehollandiae and T. novaehollandiae castanops, also failed to reveal anything but very moderate accommodative ranges. We conclude that the outstanding accommodative ability of the American barn owl is truly an exception to the modest accommodative abilities of the tytonid owls generally.
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|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal's website (see link) or contact the author. Author contact details: firstname.lastname@example.org|
|Keywords:||ocular accommodation, barn owls, Aves Tytonidae, focusing ability, animal, Tyto alba pratincola, Australian barn owl, Tyto alba delicatula, Australian tytonid owl, grass owl, Tyto longimembris, sooty owl, Tyto tenebricosa, masked owl, Tasmania, Tyto novaehollandiae novaehollandiae, Tyto novaehollandiae castanops, Photorefraction, Accommodation, Tytonidae, Near vision|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 1990 Springer|
|Copyright Statement:||The original publication is available at SpringerLink http://www.springerlink.com|
|Deposited On:||15 Jun 2006|
|Last Modified:||15 Jan 2009 17:03|
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