横断山脉大绒鼠最大代谢率的季节性差异

Seasonal variations of maximum metabolic rate in Eothenomys miletus in Hengduan mountains region

最大代谢率对于动物的生存、繁殖和分布具有关键作用。实验用开放式呼吸仪测定了大绒鼠(Eothenomys miletus)夏季和冬季的冷诱导最大代谢率和运动最大代谢率。大绒鼠夏季的冷诱导最大代谢率O2为(7.24±0.61)ml/(g.h),运动最大代谢率O2为(7.69±0.59)ml/(g.h);冬季的冷诱导最大代谢率O2为(8.61±0.42)ml/(g.h),运动最大代谢率O2为(7.51±0.51)ml/(g.h)。冷诱导最大代谢率冬夏之间具有差异显著,而运动最大代谢率则差异不显著。结果表明:栖息于横断山脉的大绒鼠由于受到低温的胁迫,导致其冷诱导最大代谢率季节性变化较大,而运动最大代谢率则相对稳定。

Maximum metabolic rate is a physiological limit that is important for animals＇ survival,reproduction and geographic distribution.Cold-induced maximum metabolic rate and locomotion maximum metabolic rate were measured in a rodent species,Eothenomys miletus,which distributed in Hengduan mountains region,in summer and winter by using the open-circuit system respirometer.Cold-induced maximum metabolic rate and locomotion maximum metabolic rate were（7.24±0.61）ml/（g·h）and（7.69±0.59）ml/（g·h）in summer,and（8.61±0.42）ml/（g·h）and（7.51±0.51）ml/（g·h）in winter,respectively.Cold-induced maximum metabolic rate is higher in winter than that in summer,while locomotion maximum metabolic rate kept relative stable.Our data indicated that seasonal fluctuations in ambient temperatures in Hengduan mountains region might be the main force to lead the seasonal variations in cold-induced maximum metabolic rate while the locomotion maximum metabolic rate is relative stable.