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Novel energy-saving strategies to multiple stressors in birds: the ultradian regulation of body temperature

机译:鸟类多重应激源的新型节能策略:体温的超温调节

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摘要

This study aimed to examine thermoregulatory responses in birds facing two commonly experienced stressors, cold and fasting. Logging devices allowing long-term and precise access to internal body temperature were placed within the gizzards of ducklings acclimated to cold (CA) (5°C) or thermoneutrality (TN) (25°C). The animals were then examined under three equal 4-day periods: ad libitum feeding, fasting and re-feeding. Through the analysis of daily as well as short-term, or ultradian, variations of body temperature, we showed that while ducklings at TN show only a modest decline in daily thermoregulatory parameters when fasted, they exhibit reduced surface temperatures from key sites of vascular heat exchange during fasting. The CA birds, on the other hand, significantly reduced their short-term variations of body temperature while increasing long-term variability when fasting. This phenomenon would allow the CA birds to reduce the energetic cost of body temperature maintenance under fasting. By analysing ultradian regulation of body temperature, we describe a means by which an endotherm appears to lower thermoregulatory costs in response to the combined stressors of cold and fasting.
机译:这项研究旨在研究面对两种常见应激源(寒冷和禁食)的鸟类的体温调节反应。允许长期和精确地获取内部体温的测井设备被放置在适应寒冷(CA)(5°C)或热中性(TN)(25°C)的小鸭the内。然后在三个相等的4天时间段内对动物进行检查:随意喂养,禁食和重新喂养。通过分析每日以及短期或超日的体温变化,我们发现,尽管田纳西州的小鸭在禁食时仅显示日常温度调节参数的适度下降,但它们从血管热的关键部位表现出降低的表面温度禁食期间交换。另一方面,CA禽类在禁食时可显着降低其体温的短期变化,同时增加长期变化。这种现象将使CA禽类减少禁食时维持体温的精力成本。通过分析体温的超调调节,我们描述了一种手段,通过这种方式吸热似乎可以降低因冷和禁食而产生的压力源的体温调节成本。

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