关键词: 种群数量, 繁殖, 性比, 胎仔数

Abstract: Objective To study the ecological characteristics of striped hamster(Cricetulus barabesis) in the central and western region of Inner Mongolia.Methods The studies were carried out in Hohhot suburbs,Dalate County and Zhengxiangbai County in the middle ten days of each month from April to October in 1991 to 1998 by rectilinear trap day method.Results The striped hamster is one subspecies Cricetulus barabese obscurus in Hohhot suburbs,Dalate County and Zhengxiangbai County.The seasonal and annual changes in population number of striped hamster were varied from 1991 to 1998.The sex ratio of the females was 53.62% and the females accounted for a larger proportion than the males in Hohhot suburbs.The sex ratio of the females was 42.11% and the males accounted for alarger proportion than the females in Dalate County.The sex ratio of the females was 49.42% in Zhengxiangbai county.The rates of testis entering scrotum from abdominal cavity were(62.16±3.29)%,(38.53±3.45)% and(76.88±6.28)% respectively in Hohhot suburbs,Datate and Zhengxiangbai County.The annual average pregnant rat rates were(19.73±2.50)%,(23.06±3.50)% and(21.89±6.23)% respectively in Hohhot suburbs,Dalate and zhengxiangbai County.The annual average litter sizes of females were(5.96± 0.10)%,(5.77±0.16)% and(5.61±0.29)% respectively in Hohhot suburbs,Dalate and zhengxiangbai County from 1991 to 1998.Conclusion The ecological characteristics of striped hamster in the 3 counties are almost same in the central and western region of Inner Mongolia.