Torpor as an emergency solution in Galago moholi: heterothermy is triggered by different constraints
Torpor as an emergency solution in Galago moholi: heterothermy is triggered by different constraints
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DOI：
10.1007/s00360-012-0725-0
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发表时间：
2013-05
期刊：
影响因子：
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通讯作者：
J. Nowack;N. Mzilikazi;K. Dausmann
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文献类型：
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作者：
J. Nowack;N. Mzilikazi;K. Dausmann
非洲小乳猴（Galago moholi）的异温性表现似乎与大多数其他异温性动物有着惊人的不同：G。moholius很少使用它进入休眠状态的能力，只有一小部分人使用休眠状态。因此，本研究的目的是总结G。moholito总结了一般模式，并将其与其他异温动物进行了比较，以阐明这些异温动物部署差异的可能原因和限制。我们的研究是在野生动物身上进行的，分别使用温度记录仪和开放流呼吸法测量体温和代谢率。moholiuses麻木只是作为最后的手段，而不是作为一个例行的，季节性的行为。然而，我们发现，一般的生理模式的麻木，例如，麻木回合持续时间或进入和唤醒时间从麻木，主要是与其他夜间日常异温动物的描述一致。发现的最大差异是在从麻木唤醒期间不寻常的低复温率，可能是由于已经耗尽的内部能量储存，从而无法动员足够的能量进行内源性加热。因此，我们的结论是，虽然一般的生理参数的异温动物似乎仍然保守，引起这种生理反应的根本原因，从而异温的表达和时间的程度，在不同的群体中进化得非常不同，这取决于身体质量和特定的栖息地和生活方式的物种。
The expression of heterothermy in the African lesser bushbaby,Galago moholi, seems to be strikingly different to most other heterotherms:G. moholiuses its ability to enter torpor only rarely and torpor is only used by a small fraction of the population. The aim of this study was, therefore, to summarize the parameters of torpor use inG. moholito conclude the general patterns and discuss them in comparison to other heterotherms to elucidate possible causes and constraints that underlie these differences in deployment of heterothermy. Our study was carried out on wild animals using temperature loggers and open-flow respirometry for measurements of body temperature and metabolic rate, respectively.G. moholiuses torpor only as a last resort and not as a routine, seasonal behavior. Nevertheless, we found that the general physiological patterns of torpor, e.g., torpor bout duration or entry and arousal times from torpor, were mainly consistent with those described for other nocturnal daily heterotherms. The greatest difference found was the unusual low rewarming rates during arousal from torpor, probably due to already depleted internal energy stores and thus inability to mobilize sufficient energy for endogenous heating. We therefore conclude that while general physiological parameters of heterothermy seem to have remained conserved in heterotherms, the underlying causes which elicit this physiological response, and thus the extent of expression and timing of heterothermy, have evolved very differently in different groups, depending on body mass and the specific habitat and lifestyle of the species.