LIGHT-SAMPLING BEHAVIOR IN PHOTOENTRAINMENT OF A RODENT CIRCADIAN-RHYTHM
LIGHT-SAMPLING BEHAVIOR IN PHOTOENTRAINMENT OF A RODENT CIRCADIAN-RHYTHM
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DOI：
10.1007/bf00612299
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发表时间：
1986-01-01
影响因子：
2.1
通讯作者：
DECOURSEY, PJ
中科院分区：
文献类型：
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作者：
DECOURSEY, PJ
记录了夜间一栖啮齿动物Glaucomys volans的昼夜运动活动节律的光夹带的行为方面。方法包括在标准轮笼或新开发的模拟窝箱中对恒暗(DD)或明暗(LD)时间表下的动物进行遥测监测和红外观察。通过窝笼，可以同时测量昼夜活动周期的几个方面，强调从休息中唤醒，松鼠用来评估环境光环境的光采样行为，以及实现光携带的相移。笼子里的每只动物都在黑暗的笼子里几乎奢侈地呆了12个小时或更长时间，然后在突然唤醒的时候转移到采光的舷窗。在黑暗中，每只动物在觉醒后立即启动轮子活动；然而，唤醒时的光诱导返回巢穴打个盹，活动开始的相移延迟约40分钟。在接下来的几天里，每只动物似乎都是自由奔跑的(24小时)，直到再次发病进入光照期。松鼠通常每天只看到几分钟的光照，在自由奔跑的日子里，偶尔也看不到12小时的光照周期。讨论了这些数据对昼夜光卷吸理论的意义。
Behavioral aspects of photoentrainment of circadian locomotor activity rhythms were recorded for a nocturnal one-dwelling rodent, the flying squirrel, Glaucomys volans. Methods included both telemetric monitoring and infrared observations of animals under constant dark (DD) or light-dark (LD) schedules in either standard wheel cages or in newly developed simulated den case. By means of the den cages, several aspects of a circadian activity cycle could be simultaneously measured emphasizing the arousal from rest, the light-sampling behavior by which a squirrel assessed the environmental photoregimen, and the phase-shifting by which photoentrainment was achieved. Each animal in a den cage remained for 12 or more hours of its rest period almost exlusively in the darkened nest box, then at an abrupt arousal time moved to the light-sampling porthole. In darkness each animal initiated wheel activity immediately after arousal; light at arousal time, however, induce a return to the nest box for a nap and a delay phase-shift in onset of activity of approximately 40 min. On subsequent days, each animal appeared to be free-running (.tau.FR < 24 h) until onset again advanced into the light period. A squirrel usually viewed only a few minutes light per day, and on free-running days occasionally saw none of the 12-h light period. The significance of these data for theories of circadian photoentrainment is discussed.