NDLI: Visual adaptations in a diurnal rodent, Octodon degus

Content Provider	Springer Nature Link
Author	Jacobs, G. H. Calderone, J. B. Fenwick, J. A. Krogh, K. Williams, G. A.
Copyright Year	2003
Abstract	The degu (Octodon degus) is a diurnal rodent, native to Chile. Basic features of vision and visual organization in this species were examined in a series of anatomical, electrophysiological and behavioral experiments. The lens of the degu eye selectively absorbs short-wavelength light and shows a progressive increase in optical density as a function of age. Electroretinograms recorded using a flicker-photometric procedure reveal three spectral mechanisms: a rod with peak sensitivity of about 500 nm and two types of cone having respective spectral peaks of about 362 nm and 507 nm. Opsin antibody labeling was used to determine the retinal distributions of the three receptor types. A total of about one-third of the approximately 9 million photoreceptors of the degu retina are cones with the two types (507 nm/362 nm) represented in a ratio of about 13:1. The contributions to vision of all three receptor types were examined in a series of behavioral experiments. A consistent feature of both the electrophysiological and behavioral results is that relatively high levels of light adaptation are required to effect the full transition from rod-based to cone-based vision. In behavioral tests degus were shown to be able to make color discriminations between ultraviolet and visible lights.
Starting Page	347
Ending Page	361
Page Count	15
File Format	PDF
ISSN	03407594
Journal	Journal of Comparative Physiology A
Volume Number	189
Issue Number	5
e-ISSN	14321351
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-04-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physiology Behavioral Neuroscience Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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