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The all-cone retina of the garter snake: spectral mechanisms and photopigment

✍ Scribed by Gerald H. Jacobs; John A. Fenwick; Michael A. Crognale; Jess F. Deegan

Publisher
Springer
Year
1992
Tongue
English
Weight
811 KB
Volume
170
Category
Article
ISSN
0340-7594

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✦ Synopsis

The retina of the garter snake contains 3 morphologically distinct classes of cone photoreceptor. The spectral mechanisms in the retinas of garter snakes (Thamnophis sirtalis and T. marcianus) were studied by recording a retinal gross potential, the electroretinogram, using a flicker photometric procedure. Spectral sensitivity functions recorded with stimuli presented at high temporal frequency (62.5 Hz) are broadly peaked in the region of 550-570 nm. These functions remain spectrally invariant (a) in the face of significant changes in stimulus pulse rate (8-62.5 Hz), (b) whether the eye is light or dark adapted, and (c) under conditions of intense chromatic adaptation. It is concluded that the garter snake has only a single class of cone pigment. The results from a curve fitting analysis suggests that this pigment has peak absorbance at about 556 nm.

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