Seasonal changes in thermogenesis of a free-ranging afrotherian small mammal, the Western rock elephant shrew (Elephantulus rupestris)

Seasonal changes in thermogenesis of a free-ranging afrotherian small mammal, the Western rock elephant shrew (Elephantulus rupestris)
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自由放养的非洲兽类小型哺乳动物西部岩象鼩(Elephantulus rupestris)产热的季节变化

DOI:
10.1007/s00360-012-0647-x
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发表时间:
2012
期刊:
Journal of Comparative Physiology B
影响因子:
--
通讯作者:
Mzilikazi N.
Mzilikazi N.
中科院分区:
--
文献类型:
--
作者:
Oelkrug R;Meyer C.W;Heldmaier G;Mzilikazi N.

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我们报告了一个小型成员的季节代谢调节的系统发育古代非洲兽目,西方岩象鼩(象)。我们记录了体温(Tb)模式,并比较了肾上腺素能诱导的非寒颤产热(NST) inE的能力。在夏季和冬季在野外被捕获。与对照组(生理盐水)相比,去甲肾上腺素(NA)治疗(0.4-0.5 mg/kg, s.c)导致耗氧量明显升高,冬季注射NA后的耗氧量增加比夏季高1.8倍。这表明,体型较小的非洲绒目动物拥有功能性棕色脂肪组织,其产热能力随季节而变化。两个季节均有冬眠记录,但冬季冬眠发生率较高(448次观测中n= 205次),冬眠期间的最低体温(Tbmin: 11.9°C)低于夏季(674次观测中n= 24次,Tbmin: 26°C)。除了寒冷,高空气湿度也可能预示着冬眠的到来。总的来说,E。rupestris表现出高度的体温调节可塑性,这主要反映在冬眠进入和觉醒的可变时间上。我们的结论是。rupestris表现出季节性代谢调节,与许多全北极啮齿动物长期以来所知的相似。
We report on the seasonal metabolic adjustments of a small-sized member of the phylogenetically ancient Afrotheria, the Western rock elephant shrew (Elephantulus rupestris). We recorded body temperature (Tb) patterns and compared the capacity for adrenergically induced nonshivering thermogenesis (NST) inE. rupestriscaptured in the wild in summer and winter. Noradrenaline (NA) treatment (0.4–0.5 mg/kg, s.c.) induced a pronounced elevation in oxygen consumption compared to controls (saline), and the increase in oxygen consumption following injection of NA was 1.8-fold higher in winter compared to summer. This suggests that the smaller members of Afrotheria possess functional brown adipose tissue, which changes in thermogenic capacity depending on the season. Torpor was recorded in both seasons, but in winter the incidence of torpor was higher (n= 205 out of 448 observations) and minimalTbduring torpor was lower (Tbmin: 11.9°C) than in summer (n= 24 out of 674 observations;Tbmin: 26°C). In addition to cold, high air humidity emerged as a likely predictor for torpor entry. Overall,E. rupestrisshowed a high degree of thermoregulatory plasticity, which was mainly reflected in a variable timing of torpor entry and arousal. We conclude thatE. rupestrisexhibits seasonal metabolic adjustments comparable to what has been long known for many Holarctic rodents.
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DOI: --
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