内蒙古库布齐沙地和呼和浩特平原黑线仓鼠种群繁殖特征的比较

为了解不同地理种群在适应当地栖息环境过程中的差异，于１９９６年利用直线夹地对内蒙古呼和浩特平原和由齐沙地环境，两个种群基因交流严重受阻的黑线仓鼠种群生殖特征进行了比较研究，结果表明，雌雄必比在平原环境较大，且秋季雌性明显增多，沙地环境全年维持稳定，平原环境雄性睾丸下降率在各季高于沙地环境近２０％。平原环境雌性在夏季性成熟率较高，沙地环境季最高。平原环境中雌性怀孕率为春、夏季较高，沙地环境仅在春季最高，且小胎仔（窝仔数少于４）所占缃例较高（１９．５％），两个种群平均胎仔数分别为６．０（平原）和５．９（沙地），这一结果说明不同地理种群生殖特性的差异受环境条件限制明显。

The Comparison of Reproductive Traits of the Striped Hamster from Kubuqi Sandy-land and Hohhot Plain of Inner Mongolia

To reveal the adaptive strategy of different geographical population of striped hamster ( Cricetulus barabensis ), the snap\|trapping method was used to study the seasonal reproductive traits on two genetic separated populations from Huhhot plain and Kubuqi sandy\|land of Inner Mongolia in 1996. The results were: 1 The ratio of female/male was larger in plain populations. 2 The falling rate of the testes into the scrotal sac of the males in plain population was 20% higher than that in the sandy\|land population in spring,summer and autumn. 3 The plain population had a higher female sexual maturity in summer and the pregnant rate was higher in spring and summer. The sandy\|land population had a high sexual maturity and pregnant rate in spring. 4 The average litter size was 6 0 in plain population and 5 9 in sandy\|land population. But the rate of the smaller litter size (less than 4) of the sandy\|land population was higher (19 5%) than that of the plain population (12 8%).The ecological adaptive significance of the different reproductive traits between the two populations were discussed.