Twilight and Photoperiod Affect Behavioral Entrainment in the House Mouse (Mus musculus)
Twilight and Photoperiod Affect Behavioral Entrainment in the House Mouse (Mus musculus)
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DOI：
10.1177/0748730409343873
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发表时间：
2009-10-01
影响因子：
3.5
通讯作者：
Hut, R. A.
中科院分区：
文献类型：
--
作者：
Comas, M.;Hut, R. A.
利用不同光周期（6、12和18 h）的光暗循环和不同持续时间（0、1和2 h）的微光转换研究了微光转换对C57 BL/6 JOlaHsd小鼠（Mus musculus）夹带的影响。分析了连续黑暗中活动的起始、重心和偏移的相角差、活动持续时间（a）以及自由运行时间（tau）。主要的发现是，在所有条件下的活动开始接近黄昏或熄灯，除了短的光周期与2小时的黄昏，活动开始平均5.3（SEM 1.07）小时后熄灯。这一发现与Boulos和Macchi的叙利亚仓鼠的结果形成对比，当类似的光周期和黄昏条件下，观察到一个矩形LD周期相比，提前5.9小时的活动开始。作者认为，2小时的黄昏在这两个物种的相反的影响可能与他们不同的自由运行的时间在DD条件下夹带到短光周期与2小时黄昏条件。由于作者在较长的曙暮光条件下观察到夹带相位角的较大变化，曙暮光不一定形成较强的授时伯。
The effect of twilight transitions on entrainment of C57BL/6JOlaHsd mice (Mus musculus) was studied using light-dark cycles of different photoperiods (6, 12, and 18 h) and twilight transitions of different durations (0, 1, and 2 h). Phase angle differences of the onset, center of gravity, and offset of activity, activity duration (a), as well as free-running period (tau) in continuous darkness were analyzed. The main finding was that for all conditions the onset of activity was close to dusk or lights-off except for the short photoperiod with 2 h of twilight where activity onset was on average 5.3 (SEM 1.07) h after lights-off. This finding contrasts with the results of Boulos and Macchi for Syrian hamsters where a 5.9-h earlier activity onset was observed when similar photoperiod and twilight conditions are compared with a rectangular LD cycle. The authors suggest the opposite effects of 2 h of twilight in the 2 species may be related to their different free-running periods under DD conditions following entrainment to short photoperiod with 2-h twilight conditions. Since the authors observed larger variation in phase angle of entrainment in longer twilight conditions, twilight does not necessarily form a stronger zeitgeber.