This study was carried out to reveal the seasonal dietary variation of striped hamster (Cricetulus barabensis ) in Kubuqi desert of Ordos semi-arid environment in 1996.The food composition was determined by checking s...This study was carried out to reveal the seasonal dietary variation of striped hamster (Cricetulus barabensis ) in Kubuqi desert of Ordos semi-arid environment in 1996.The food composition was determined by checking stomach and pouch contents.The results showed that striped hamster ate more insects and seeds than other foods in spring.The food habit changed to plant leaves and seeds in summer.In autumn the food content was mainly seeds.The animal chose perennial and annual seeds alternatively between summer and autumn.This indicated that the food habit was modified by the availability of food resources and animals’need for water and energy in this arid environment.展开更多
文摘This study was carried out to reveal the seasonal dietary variation of striped hamster (Cricetulus barabensis ) in Kubuqi desert of Ordos semi-arid environment in 1996.The food composition was determined by checking stomach and pouch contents.The results showed that striped hamster ate more insects and seeds than other foods in spring.The food habit changed to plant leaves and seeds in summer.In autumn the food content was mainly seeds.The animal chose perennial and annual seeds alternatively between summer and autumn.This indicated that the food habit was modified by the availability of food resources and animals’need for water and energy in this arid environment.
文摘为进一步阐明小型哺乳动物对环境低温的适应对策,测定了黑线仓鼠在冷驯化(5℃)和复温(23℃)过程中的基础代谢产热(基础代谢率,basal metabolic rate,BMR)和非颤抖性产热(non-shivering thermogenesis,NST)的变化。结果显示,在暖温环境下饲养的黑线仓鼠基础代谢率为1.23±0.10 mL O2.g-1.h-1,非颤抖性产热为4.69±0.34 mL O2.g-1.h-1均低于其体重异速生长方程计算的期望值;在冷驯化过程中,BMR增加,第3周达到最高值,比常温条件下增加了85.4%;NST随冷驯化时间的延长也有显著增加,第5周达最大值,比常温条件下增加了52.5%。在复温过程中,BMR和NST都降低,NST第1周即可降到初始水平。表明,在暖温条件下,黑线仓鼠具有较低的BMR和NST;在冷驯化过程中,通过增加BMR和NST,弥补低温下热量散失,维持恒定的体温,其中NST在冷适应增加产热中起主要作用。这些冷适应特征兼有北方物种和干旱沙漠物种的特点。
