关键词: 五趾跳鼠, 种群数量, 怀孕率, 繁殖指数

Abstract: Objective The regularity of population dynamics of mongolia five toed jerboa (Allactaga sibirica) were studies in the central and western region of Inner Mongolia to provide the basis of prediction and control. Methods The population dynamics of mongolia five toed jerboa was investigated by rectilinear-trapping method in the middle ten days of each month from April to October in Hohhot suburbs,Dalate County and from May to September in Zhengxiangbai county. Results Mongolia five toed jerboa was the common species but the population number of them were less in Hohhot suburbs,Dalate county and Zhengxiangbai county. The seasonal fluctuation of mongdia five toea jerboa population were different in Hohhot suburbs,Dalat Xounty and Zhengxiangbai county. The seasonal fluctuation was the type of single peak and the peak of them was in spring season in Hohhot suburbs and Dalat county. The seasonal fluctuation was the type of double peak and the first peak was taller than second in Zhengxiangbai county. An annual fluctuation of population number were different in Hohhot suburbs,Dalat county and Zhengxiangbai county. The tallest in Hohhot suburbs,second with Zhengxiangbai county,and then with Dalate county. Conclusion The important elements affecting it's population dynamics are the pregnant rate,reproduction index and the population number of other species (northern three-toed jerboa,little Chinese jird,desert hamster and striped hamster) in the investigated region.