关键词: 大绒鼠, 能量代谢, 产热, 表型可塑性

Abstract: In order to investigate the effect of ambient temperature on phenotypic plasticity of body temperature,body mass and energy metabolism,body temperature,body mass,energy budget,rest metabolic rate (RMR)and non-shivering thermogenesis (NST) were measured for eight weeks at various temperatures. Eothenomys miletus were divided into two
groups. The first group was exposed to warm temperature (30℃ ;12L∶ 12D)for four weeks and then to cold temperature (5℃ ;12L∶12D)for four weeks. The second group was first exposed to cold temperature (5℃ ;12L∶12D)for four weeks and then to warm temperature (30℃ ;12L∶ 12D)for four weeks.The results showed the following:In the first group,body
temperature and body mass increased,whereas energy intake,RMR and NST decreased,the minimum point appeared on 28 d when exposed first to warm temperature;when exposed to the cold temperatures,E. miletus showed opposite trends. In the second group,body temperature and body mass decreased,while energy intake,RMR and NST increased,the maximal point appeared at 28d when exposed first to warm temperature;when exposed to the cold temperatures,E. miletus showed opposite trends. All of the results indicated that temperature may be one of the most significant environmental factors to influence phenotypic plasticity of body mass,energy metabolism and thermogenesis in E. miletus adaptation to variations of temperature.

Key words: Eothenomys miletus, Energy metabolism, Phenotypic plasticity, Thermogenesis