鄂尔多斯沙地草场黑线仓鼠种群特征研究

Studies on the Population Dynamics of Striped Hamster in Ordos Sandland

目的 研究黑线仓鼠种群特征为预测和防制提供依据。方法 1991～ 1998年 4～ 10月每月中旬利用直线夹日法在中国农业科学院草原研究所鄂尔多斯沙地草场改良试验站进行调查 ,捕获鼠按常规测量称重后解剖 ,详细记录繁殖情况。结果 用胴体重划分成 5个年龄组 ,黑线仓鼠种群数量季节变动明显 ,年均捕获率差别不大 ,波动在0 .36 %～ 1.49%之间。 8年中黑线仓鼠总的性比为 5 8.2 9% ,只有 1998年雌性多于雄性 ,其余各年均是雄性多于雌性 ,黑线仓鼠在调查区繁殖期为 3～ 10月 ,8年间春季繁殖开始期无差别 ,结束期差别较大。雌性年平均怀孕率为 2 5 .93 % ,平均胎仔数 ( 5 .77± 0 .16 )个 ,怀孕率和胎仔数有年间差异。

Objective The study on the population dynamics of striped hamster provided the basis for prediction and control. Methods The population dynamics of striped hamster (Cricetulus barabensis) was investigated by rectilinear-trapping method in the middle ten days of each month from April to October from 1991 to 1998 on Ordos sandland. Results All the specimens were divided into five age groups based on their body weight excluding viscera. There are seasonal and annual changes in population number of striped hamster. The sex ratio was 58.29% of all the specimens and the male accounted for a larger proportion than the females. The beginning breeding period of the females was the same with years. The stopping beeding priod of the females varied every years. An annual average liller size of female was 5.77±0.16 in 1991-1998. An annual average pregnant rate was 25.93%.