Photoperiodic regulation of the gonadal recrudescence in common Indian Rosefinch: Dependence on circadian rhythms
✍ Scribed by Kumar, Vinod ;Tewary, P. D.
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 308 KB
- Volume
- 223
- Category
- Article
- ISSN
- 0022-104X
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✦ Synopsis
Abstract
Male Rosefinches, previously treated with short days (8L: 16D), were held under six different light regimes (resonance light cycles) in which a main 6‐hr photophase was combined with varying durations of scotophases (6L/6(2n + l)D)L, light phase; D, dark phase; n, number of multiples of 6D.
; one group was also placed under long days (15L:9D) which served as control. Birds placed under long days as well as 6L:6D, 6L:30D, 6L:54D showed complete gonadal growthand development, while birds under 6L:18D, 6L:42D, 6L:66D showed no testicular growth and behaved as if they had been exposed to short days. These results are consistent with the Bünning hypothesis and indicate that the photoperiodic time measurement in Common Indian Rosefinches (Carpodacus erythrinus) involves an endogenous rhythm of approximately 24 hr in duration.