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:
影响因子:
--
通讯作者:
Mzilikazi N.
中科院分区:
文献类型:
--
作者:
Oelkrug R;Meyer C.W;Heldmaier G;Mzilikazi N.
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:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
G. Rathbun
通讯作者:
G. Rathbun
DOI:
--
发表时间:
1978
期刊:
Experientia. Supplementum
影响因子:
--
作者:
David O. Foster;M. Lorraine Frydman
通讯作者:
M. Lorraine Frydman
影响因子:
1.6
作者:
N. Mzilikazi;B. G. Lovegrove
通讯作者:
B. G. Lovegrove
DOI:
10.1007/bf00688890
发表时间:
1982-01-01
期刊:
JOURNAL OF COMPARATIVE PHYSIOLOGY
影响因子:
--
作者:
HAIM, A
通讯作者:
HAIM, A
DOI:
--
发表时间:
2004
期刊:
Journal of Comparative Physiology □ B
影响因子:
--
作者:
S. Saarela;R. Hissa
通讯作者:
R. Hissa