长爪沙鼠种群繁殖动态研究

Study on Reproduction Dynamics of Clawed Jird ( Meriones unguiculatus M. )

１９８８～１９９５年在甘肃武威对长爪沙鼠（Ｍｅｒｉｏｎｅｓｕｎｇｕｉｃｕｌａｔｕｓ）繁殖动态的研究结果表明：从年龄结构看长爪沙鼠种群呈纺锤形，即亚成体和成体组占的比例大，成体是当年的繁殖主体，亚成体是翌年的繁殖主体，具有潜在的增长态势；其性比在繁殖月份中，除最初的两个月外，其余繁殖月份雌雄差异显著，而在刚开始繁殖的前两个月（３、４月）和非繁殖月份雌雄差异均不显著；长爪沙鼠的繁殖季节在３～９月份，其繁殖指数呈二次曲线变化，经一元二次回归分析得其回归方程Ｉ＝１５６２４＋０９９４５ｔ００８５ｔ２。

The reproduction dynamics of Clawed jird (Meriones unguiculatus) in Wuwei of Gansu province was studied from 1988 to 1995. The results indicate that the age pyramid of clawed jird shows a spindle distribution in each year. The adult and subadult take a higher percentage. The adult is the main body of reproduction in the first year, and the subadult is the main body of reproduction in the next year. The population number has the potential growth tendency. The sex ration shows a remarkable difference in reproductive term(from March to Sept.) except first two months,and in which time (March. April)and noreproductive term,the sex ratio of the population is regular.By regressive analyses ,the change of reproduction index presents a quadratic curve I=1.5624+0.9945t 0.085t 2