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首页> 外文期刊>Chronobiology international >Plasticity of Circadian Activity and Body Temperature Rhythms in Golden Spiny Mice
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Plasticity of Circadian Activity and Body Temperature Rhythms in Golden Spiny Mice

机译：金刺小鼠昼夜活动的可塑性和体温节律

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Most animals can be categorized as nocturnal, diurnal, or crepuscular. However, rhythms can be quite plastic in some species and vary from one individual to another within a species. In the golden spiny mouse (Acomys russatus), a variety of rhythm patterns have been seen, and these patterns can change considerably as animals are transferred from the field into the laboratory. We previously suggested that these animals may have a circadian time-keeping system that is fundamentally nocturnal and that diurnal patterns seen in their natural habitat reflect mechanisms operating outside of the basic circadian time-keeping system (i.e., masking). In the current study, we further characterized plasticity evident in the daily rhythms of golden spiny mice by measuring effects of lighting conditions and access to a running wheel on rhythms in general activity (GA) and body temperature (Tb). Before the wheel was introduced, most animals were active mainly during the night, though there was considerable inter-individual variability and patterns were quite plastic. The introduction of the wheel caused an increase in the level of nighttime activity and Tb in most individuals. The periods of the rhythms in constant darkness (DD) were very similar, and even slightly longer in this study (24.10.2h) than in an earlier one in which animals had not been provided with running wheels. We found no correlation between the distance animals ran in their wheels and the period of their rhythms in DD. Re-entrainment after phase delays of the LD cycle occurred more rapidly in the presence than absence of the running wheel. The characteristics of the rhythms of golden spiny mice seen in this study may be the product of natural selection favoring plasticity of the circadian system, perhaps reflecting what can happen during an evolutionary transition as animals move from a nocturnal to a diurnal niche.
机译：大多数动物可分为夜间，昼夜或夜行性。但是，在某些物种中，节奏可能是相当可塑性的，并且在一个物种中，每个人的节奏会有所不同。在金黄色的有刺老鼠（Acomys russatus）中，已经观察到各种节奏模式，随着动物从田间转移到实验室中，这些模式可能会发生很大变化。我们以前曾建议这些动物可能具有基本上是夜间活动的昼夜节律系统，并且在其自然栖息地中看到的昼夜模式反映了在基本昼夜节律系统之外运行的机制（即掩蔽）。在当前的研究中，我们通过测量光照条件和通行轮对一般活动（GA）和体温（Tb）的节律的影响，进一步表征了金刺小鼠日常节律中明显的可塑性。在引入轮子之前，大多数动物主要在夜间活动，尽管个体间存在相当大的变异性，且图案十分可塑性。车轮的引入导致大多数人的夜间活动水平和Tb升高。持续黑暗（DD）中的节律周期非常相似，在这项研究中（24.10.2h）甚至比在早期没有为动物提供跑轮的节律中的周期更长。我们发现动物在轮子上奔跑的距离与DD的节奏周期之间没有相关性。 LD循环相位延迟后的重新夹带在有轮状态下比在没有轮组时更快地发生。在这项研究中看到的金色多刺小鼠的节律特征可能是自然选择的产物，有利于昼夜节律系统的可塑性，这也许反映了当动物从夜间转为昼夜生态位时在进化过渡期间可能发生的情况。

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