Tomlinson Sean, Withers Philip C, Cooper Christine
Zoology, School of Animal Biology MO92, University of Western Australia, 35 Stirling Highway, Crawley, Perth, Western Australia 6009, Australia.
Comp Biochem Physiol A Mol Integr Physiol. 2007 Nov;148(3):645-50. doi: 10.1016/j.cbpa.2007.08.013. Epub 2007 Aug 16.
This study compared torpor as a response to food deprivation and low ambient temperature for the introduced house mouse (Mus musculus) and the Australian endemic sandy inland mouse (Pseudomys hermannsburgensis). The house mouse (mass 13.0+/-0.48 g) had a normothermic body temperature of 34.0+/-0.20 degrees C at ambient temperatures from 5 degrees C to 30 degrees C and a basal metabolic rate at 30 degrees C of 2.29+/-0.07 mL O2 g(-1) h(-1). It used torpor with spontaneous arousal at low ambient temperatures; body temperature during torpor was 20.5+/-3.30 degrees C at 15 degrees C. The sandy inland mouse (mass 11.7+/-0.16 g) had a normothermic T(b) of 33.0+/-0.38 degrees C between T(a) of 5 degrees C to 30 degrees C, and a BMR of 1.45+/-0.26 mL O2 g(-1) h(-1) at 30 degrees C. They became hypothermic at low T(a) (T(b) about 17.3 degrees C at T(a)=15 degrees C), but did not spontaneously arouse. They did, however, survive and become normothermic if returned to room temperature (23 degrees C). We conclude that this is hypothermia, not torpor. Consequently, house mice (Subfamily Murinae) appear to use torpor as an energy conservation strategy whereas sandy inland mice (Subfamily Conilurinae) do not, but can survive hypothermia. This may reflect a general phylogenetic pattern of metabolic reduction in rodents. On the other hand, this may be related to differences in the social structure of house mice (solitary) and sandy inland mice (communal).
本研究比较了引入的家鼠（小家鼠）和澳大利亚本土的沙地内陆鼠（赫氏伪鼠）对食物剥夺和低环境温度的反应——蛰伏情况。家鼠（体重13.0±0.48克）在5摄氏度至30摄氏度的环境温度下，正常体温为34.0±0.20摄氏度，在30摄氏度时的基础代谢率为2.29±0.07毫升氧气/克（-1）小时（-1）。它在低环境温度下会进入伴有自发苏醒的蛰伏状态；在15摄氏度时，蛰伏期间的体温为20.5±3.30摄氏度。沙地内陆鼠（体重11.7±0.16克）在5摄氏度至30摄氏度的环境温度下，正常体温为33.0±0.38摄氏度，在30摄氏度时的基础代谢率为1.45±0.26毫升氧气/克（-1）小时（-1）。它们在低环境温度下会体温过低（在15摄氏度时体温约为17.3摄氏度），但不会自发苏醒。然而，如果将它们放回室温（23摄氏度），它们能够存活并恢复正常体温。我们得出结论，这是体温过低，而非蛰伏。因此，家鼠（鼠亚科）似乎将蛰伏作为一种节能策略，而沙地内陆鼠（兔耳袋狸亚科）则不然，但它们能够在体温过低的情况下存活。这可能反映了啮齿动物代谢降低的一般系统发育模式。另一方面，这可能与家鼠（独居）和沙地内陆鼠（群居）的社会结构差异有关。
