Bhardwaj S K
Department of Zoology, Chaudhary Charan Singh University, Meerut, India.
Indian J Exp Biol. 2006 Apr;44(4):325-9.
To examine the importance of the inductive light period of a skeleton photoperiod in relation to the endogenous circadian rhythm of photoinducibility mediating photoperiodic induction, P. domesticus were exposed for 28 weeks to a series of skeleton photoperiods, viz. 6L:4D:1L:13D, 6L:6D:1L:11D. 6L:8D:1L:9D and 6L:14D:1L:3D. The inductive effects of 1 hr light pulse at night varied depending on the time of its placement. To compare the inductive effects of complete and its corresponding skeleton photoperiods, birds in the second experiment were subjected for 20 weeks to 12L:12D and 6L:5D:1L:12D given daily or interposed on alternate days with constant darkness (12L:12D/DD and 6L:5D:1L:12D/DD). There was a difference in the rate and magnitude of response between the complete and skeleton photoperiods. It appears that the subtropical house sparrow uses photoperiodic strategy in regulation of its seasonal testicular responses similar to that is reported for its temperate population.
为了研究骨架光周期的诱导光照期与介导光周期诱导的内源性昼夜光诱导节律的关系，将家麻雀暴露于一系列骨架光周期下28周，即6小时光照：4小时黑暗：1小时光照：13小时黑暗、6小时光照：6小时黑暗：1小时光照：11小时黑暗、6小时光照：8小时黑暗：1小时光照：9小时黑暗和6小时光照：14小时黑暗：1小时光照：3小时黑暗。夜间1小时光脉冲的诱导效应因放置时间而异。为了比较完整光周期及其相应骨架光周期的诱导效应，在第二个实验中，让鸟类在20周内接受每日或隔日给予的12小时光照：12小时黑暗以及6小时光照：5小时黑暗：1小时光照：12小时黑暗，并伴有持续黑暗（12小时光照：12小时黑暗/持续黑暗和6小时光照：5小时黑暗：1小时光照：12小时黑暗/持续黑暗）。完整光周期和骨架光周期之间在反应速率和幅度上存在差异。亚热带家麻雀似乎在调节其季节性睾丸反应时采用了与温带种群报道的类似的光周期策略。
