松果体切除和持续光照消除了雀科鸣禽的昼夜栖息节律，但并未改变其年度生殖或育肥节律。
Pinealectomy and LL abolished circadian perching rhythms but did not alter circannual reproductive or fattening rhythms in finches.
作者信息
Pant K, Chandola-Saklani A
机构信息
Reproductive and Wildlife Biology Unit, Garhwal University, Srinagar, India.
出版信息
Chronobiol Int. 1992 Dec;9(6):413-20. doi: 10.3109/07420529209064553.
In the subtropical finch, spotted munia (Lonchura punctulata), circanual rhythms (of gonads, fattening, feeding) have been demonstrated in an information-free environment of continuous illumination (LL), rendering it an ideal model for research on the physiology of the circannual clock. In an attempt to understand the involvement, if any, of the circadian system in the genesis of circannual rhythms, we studied the effect of pinealectomy (LL 15 lux) and strong continuous illumination (LL 300 lux), both known to abolish circadian rhythms, on the circadian perch-hopping rhythm and on the circannual rhythm of reproduction and fattening in the same birds. While both pinealectomy and LL 300 lux treatments abolished the circadian rhythm of motor activity, they had no effect on the circannual rhythms of gonadal size and fattening. If the endogenous circadian rhythm in perch-hopping can be taken to reflect the circadian clock mechanism associated with gonadal functioning, present results suggest that circannual rhythm of reproduction in spotted munia is independent of circadian events.
在亚热带雀类——斑文鸟（Lonchura punctulata）中，已证实在持续光照（LL）这种无信息环境下，（性腺、育肥、进食的）年周期节律存在，这使其成为研究年周期生物钟生理学的理想模型。为了探究昼夜节律系统在年周期节律产生过程中是否有作用（若有作用则探究其作用方式），我们研究了松果体摘除（LL 15勒克斯）和强持续光照（LL 300勒克斯）对同一批鸟类昼夜栖息跳跃节律以及繁殖和育肥年周期节律的影响，已知这两种处理都会消除昼夜节律。虽然松果体摘除和LL 300勒克斯处理都消除了运动活动的昼夜节律，但它们对性腺大小和育肥的年周期节律没有影响。如果可以认为栖息跳跃中的内源性昼夜节律反映了与性腺功能相关的昼夜节律钟机制，那么目前的结果表明，斑文鸟的繁殖年周期节律独立于昼夜节律事件。
Zotero 插件