Pratt B L, Goldman B D
Physiol Behav. 1986 Jan;36(1):83-9. doi: 10.1016/0031-9384(86)90078-8.
Male Syrian hamsters were housed in simulated burrows in order to investigate (a) how these nocturnal, fossorial rodents entrain to the prevailing light:dark cycle in this semi-natural habitat and (b) the response of the reproductive system to environmental illumination. The burrow emergence activity of hamsters housed in simulated burrows was compared to the running wheel activity of animals maintained in standard cage conditions. The activity rhythm was similar in both measuring devices. The data suggested that in a natural environment hamsters are only exposed to light for short amounts of time each day. To determine whether brief photoperiodic stimulation could alter the phase angle of entrainment and/or the reproductive condition, burrow housed animals were exposed to a supplemental 30-second light pulse during specified clock hours of the dark period on a daily basis. These light pulses induced a phase shift and maintained a long day reproductive response in what was otherwise a short photoperiod.
雄性叙利亚仓鼠被安置在模拟洞穴中，以研究：(a) 这些夜行性穴居啮齿动物如何在这种半自然栖息地中与主要的明暗周期同步；(b) 生殖系统对环境光照的反应。将安置在模拟洞穴中的仓鼠的出洞活动与饲养在标准笼养条件下的动物的转轮活动进行比较。两种测量装置中的活动节律相似。数据表明，在自然环境中，仓鼠每天仅短时间暴露于光照下。为了确定短暂的光周期刺激是否会改变同步相位角和/或生殖状态，每天在黑暗期的特定时钟时间，将安置在洞穴中的动物暴露于30秒的补充光脉冲下。这些光脉冲诱导了相位偏移，并在原本短光周期的情况下维持了长日照生殖反应。
