阿拉善黄鼠的生命表及繁殖

将采自野生种群的阿拉善黄鼠(Spermophilus dauricus alaschanicus Buechner)( 下称黄鼠)样本划分为8个年龄间隔，然后编制生命表。结果表明，黄鼠的平均死亡率(qx)为0.7512(♂)和0．6222(♀)，平均寿命为1.3311年(♂)和1.1073年(♀)。0-l岁龄黄鼠的期望寿命(ex)为0.8311年(♂)和1.1073年(♀)。世代净增殖率(R_o)每代为l.7327。种群内禀增长率(瞬时)(r_m)为0.1433，世代平均时间(T)为3.8346年，周限增长率(r)为1.1541/年。

LIFE TABLE AND REPROUCTION OF ALASHAN GROUND SQUIRREL

Spscimens of wild Alashan ground squirrel (Spermophilus dauricus aJachanicus)have been got at Huan county, Gansu province, and eight age intervals of the specimens have been determined. According to the specimens, the life table has been studied. The results are as follows: The mean mortality (qx) of the ground squirrel is 0.7512 ( ) and 0.6222 respectively; the mean life is 1.3311 year ( ) and 1.6073 year( ) respectively (Table 1). The net icproductive rate (R0) is 1.7327 per generation. The intrinsic rate of increase (instantaneous) (rm) is 0.1433/year; the mean time per generation(T) is 3.8346 year and the finite increasing rate(A) is 1.1541/year (Table 3).