布氏田鼠种群不同变动期的季节存活率研究

STUDY ON SEASONAL SURVIVAL RATES OF THE POPULATIONS OF MICROTVS BRANDTI IN DIFFERENT PERIODS

作者于1990～1996年在内蒙古正镶白旗、太仆寺旗典型草原采用标志流放法研究了布氏田鼠种群在数量下降期和上升期的季节存活率及其对数量测报的意义。研究结果表明,该鼠的季节存活率以秋季最高,数量上升期(1996年)达到93.39％,数量下降期亦保持在62.98％～76.94％之间。依据秋末与初春数量之差计算出的冬季存活率是各季节中最低的,其数量上升期为34％～41％,而数量下降期仅为11％～32％;春夏繁殖期间的存活率平均为68.7％。存活率还与洞系内个体数有关,特别是冬季存活率与洞系内个体数呈显著正相关。

Seasonal survival rates of two populations of Brandt's vole (Microtus brandti) was estimated by using captured-recaptured method from 1990 to 1996 in Zhengxiangbai Banner and Tipus Banner,Inner Mongolia, and feeding data was refereed in a laboratory. Both the period of the populations upward and falling off, the survival was lowest in winter, mean 0. 2473±0. 0748 ;and the highest, mean 0. 6870 ± 0. 1137, in autumn. The survival rate was lower in autumn and winter in the falling off than upward evidently. The numberic of voles in a burrow system is related seasonal survival rate, especially in winter.