关键词: 岩羊, 生命表, 社群结构

Abstract: Based on 62 male skulls with horns from the field and determined the age by growth ring of horn，the static life cabledsurvivorship curve and age structure of blue sheep(Pseudois nayaur)population were studied from July to September,1995, and from April to May, 1996, in Helan mountain of Ningxia Hui Autonomus region. The natural death of individual began to increase after the age of 5.5 years old，9.5 years old was another peak(qx=0..5).Over 50% survivor individuals were 8 years old or more. The life expectancy of blue sheep in Helan Mountain was 13 years old. The male's survivor curve showed a typical“A”. According to 139 groups from 808 blue sheep observed in spring of 1996 and 67 groups from 448 individuals in summer of 1995, the group structure, size and sex ratio were studied. The ratio of young to adult female is similar in these two seasons. Blue sheep group size varied insignificantly between spring and summer (P<0.05).The percent of small group<0.05).The percem mixed group in spring(79.90 n)is significaW bigger khan }ha} of summer(37 . 3 0 n)(P> (<11 inds./group) is 93.1% in spring and 90.5% in summer. The percent of female group in spring (8.6%)is significant smaller than that of summer(44.8%) (p<0.05).the percent of mixed group in spring (79.9%)is significant bigger than that of summer(37.3%)(p<0.05).

Key words: Blue sheep(Pseudis nayaur), Life tables, Group structure