Tripathi P M, Tewary P D
Department of Zoology, Banaras Hindu University, Varanasi, India.
Acta Physiol Hung. 1988;72(1):79-84.
Groups of adult photosensitive male yellow-throated sparrows were subjected to different intermittent light cycles viz. 2L/2D, 3L/3D, 4L/4D, 8L/8D and 12L/12D besides two control groups held on 8L/16D and 18L/6D photoperiodic treatments. Testicular growth occurred in 2L/2D, 3L/3D, 4L/4D and 18L/6D but not in 8L/16D, 12L/12D and 8L/16D photoperiodic regimes. The results of this experiment can be interpreted on the basis of circadian rhythm in photosensitivity in an avian external coincidence model. Our findings suggest that multiple light flashes are more effective than a single broad pulse of light of equal duration.
将成年光敏雄性黄喉鹀分成几组，除了两个对照组分别采用8小时光照/16小时黑暗和18小时光照/6小时黑暗的光周期处理外，对它们进行不同的间歇性光周期处理，即2小时光照/2小时黑暗、3小时光照/3小时黑暗、4小时光照/4小时黑暗、8小时光照/8小时黑暗和12小时光照/12小时黑暗。在2小时光照/2小时黑暗、3小时光照/3小时黑暗、4小时光照/4小时黑暗和18小时光照/6小时黑暗的光周期条件下，睾丸出现生长，但在8小时光照/16小时黑暗、12小时光照/12小时黑暗和8小时光照/16小时黑暗的光周期条件下则没有。本实验结果可根据鸟类外部契合模型中光敏感性的昼夜节律来解释。我们的研究结果表明，多次闪光比相同持续时间的单次宽脉冲光更有效。
