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Effects of pinealectomy and melatonin on the photoperiodic gonadal response of the male lizardAnolis carolinensis

✍ Scribed by Underwood, Herbert

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
484 KB
Volume
217
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The effects of pinealectomy and exogenous melatonin treatment on the photoperiodic testicular response in the lizard Anolis carolinensis were examined at two times of year. In the summer (July–August) neither pinealectomy nor melatonin affected the photoperiodic response. In the fall (September–October) pinealectomy had a progonadal effect in lizards maintained on either LD 8:16 or LD 14:10 photoperiods. Melatonin blocked the gonadal development in response to pinealectomy on LD 8:16 but melatonin did not inhibit the acceleration in testicular development caused by pinealectomy on LD 14:10. However, melatonin did inhibit testicular development in intact (nonpinealectomized) anoles exposed to LD 14:10.

These results show that pinealectomy can modify testicular function in Anolis, that the effects of pinealectomy are seasonal, and that melatonin may be a reproductively active factor involved.

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