【摘要】 利用 62架自然死亡的雄性岩羊角 ,初步探讨了贺兰山岩羊种群的生命表、年龄结构和存活曲线 :贺兰山岩羊 5 5龄和 9 5龄死亡率明显增大 ,为两个死亡高峰 ;有一半以上的雄性个体年龄超过 8岁 ;存活曲线基本接近A型。此外 ,将春季调查的 1 39群 80 8只岩羊和夏季调查的 67群 448只岩羊的社群结构进行比较 ,发现春季与夏季的雌幼比相似 ,雌雄比都是雄性大于雌性 ;春、夏季社群大小变化不显著 (P >0 0 5) ,并且贺兰山岩羊小群 (<1 1个体 /群 )在春、夏两季所占百分数最大 ;夏季单独存在的个体的百分数较春季增加1 2 9% (P <0 0 5) ;雌性群所占百分数春季 (8 6% )明显小于夏季 (44 8% ) (P <0 0 5) ;混合群的百分数春季 (79 9% )明显大于夏季 (37 3% ) (P <0 0 5)。更多还原

【Abstract】 Based on 62 male skulls with horns from the field and determined the age by growth ring of horn,the static life table,survivorship 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(<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).更多还原