Social forces can impact the circadian clocks of cohabiting hamsters
Social forces can impact the circadian clocks of cohabiting hamsters
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DOI：
10.1098/rspb.2013.2535
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发表时间：
2014-03-22
影响因子：
4.7
通讯作者：
Schwartz, William J.
中科院分区：
文献类型：
--
作者：
Paul, Matthew J.;Indic, Premananda;Schwartz, William J.
许多野外和实验室研究表明，社会环境影响许多物种的日常节律。然而，包括昼夜节律系统作用在内的潜在机制尚不清楚。这项研究的障碍是无法跟踪和客观地分析圈养在一起的单个动物的节律。在这里，我们使用温度数据记录器跟踪在恒定黑暗中的一对同居的雄性叙利亚仓鼠(Mesocricus Auratus)的个体体温节律，并应用连续小波变换来确定同居前、同居中和同居后的节律开始的相位。在34%的个体中，同居改变了预期的节律开始轨迹，占配对个体的58%，相比之下，单独饲养的仓鼠中，有12%的个体被认为是虚拟配对的对照组。与预测轨迹的偏差是由于昼夜节律(Tau)的变化，它往往是不对称的-在11对受影响的对子中有9对影响到其中的一个个体-并暗示优势可能起到了作用。这些数据表明，生物钟的速度发生了变化，这是一种社会因素可以改变日常节奏的机制。微型数据记录器与小波分析相结合，应该会为未来的研究提供强大的工具，研究社会对日常时间的影响的原理和机制。
A number of field and laboratory studies have shown that the social environment influences daily rhythms in numerous species. However, underlying mechanisms, including the circadian system's role, are not known. Obstacles to this research have been the inability to track and objectively analyse rhythms of individual animals housed together. Here, we employed temperature dataloggers to track individual body temperature rhythms of pairs of cohabiting male Syrian hamsters (Mesocricetus auratus) in constant darkness and applied a continuous wavelet transform to determine the phase of rhythm onset before, during, and after cohabitation. Cohabitation altered the predicted trajectory of rhythm onsets in 34% of individuals, representing 58% of pairs, compared to 12% of hamsters single-housed as 'virtual pair' controls. Deviation from the predicted trajectory was by a change in circadian period (tau), which tended to be asymmetric-affecting one individual of the pair in nine of 11 affected pairs-with hints that dominance might play a role. These data implicate a change in the speed of the circadian clock as one mechanism whereby social factors can alter daily rhythms. Miniature dataloggers coupled with wavelet analyses should provide powerful tools for future studies investigating the principles and mechanisms mediating social influences on daily timing.