【摘要】 20 0 3年 1 1～ 1 2月和 2 0 0 4年 4～ 6月在贺兰山国家级自然保护区对岩羊 (Pseudoisnayaur)春冬两季集群行为进行了初步研究。春季观察到的 2 1 8群 1 3 70只岩羊样本和冬季观察到的 3 1 0群 1 3 3 6只岩羊样本进行了比较 ,发现春季平均岩羊群大小为 (5. 5 7± 5 .3 8)只 ,冬季平均岩羊群大小为 (4. 2 9± 5 . 48)只 ,春冬两季岩羊集群大小季节性变化不显著 (P >0. 0 5 )。贺兰山岩羊在春冬两季 2～ 8只的群所占比例均居多 (春季 :85 . 3 % ;冬季 94 8% )。春季贺兰山岩羊群以雌性群 (4 0 . 3 % ,n =88)为主 ,冬季以混合群(4 9 7% ,n =1 5 4)和雌性群 (4 8 4% ,n=1 5 0 )为主。春冬两季雌性群平均大小间 (P >0 . 0 5 ) ,雄性群平均大小间 (P >0 . 0 5 )和混合群平均大小间 (P >0 . 0 5 )均无显著性差异。将春季和冬季贺兰山岩羊的雌雄比与雌幼比相比 ,春季观察到的雄性个体偏多 ,冬季观察到的幼体较春季多。更多还原

【Abstract】 Age structure, size and sex ratio of Blue Sheep (Pseudois nayaur) in groups were studied from Nov. to Dec.,2003 and from April to June,2004 in Helan mountain of Ningxia Hui Autonomous region. A total of 218 groups of 1 370 Blue Sheep were accumulatively observed in spring and 310 groups of 1 337 individuals in early winter. Blue Sheep were frequently seen in small herds of 2 to 8 individuals, which represent 94.8% of the total herds observed in early winter and 85.3% in spring. The mean size of social group was 5.57±5.38 (n=218) in spring and 4.29±5.48 (n=310) in early winter. No significantly difference was found in average group size between spring and early winter (P>0.05) in this study.In spring, female group (40.3%,n=88)is the main group type, however, mixed group(49.7%,n=154) and female group (48.4%,n=150) were predominated in early winter. The proportion of female group and its stability were not quite different in spring and early winter while frequencies of mixed group and male group observed varied seasonally. In both seasons, the size of mixed group is largest and the female group is smallest. The average size in spring and early winter for female group is 2.91±1.23 and 2.6±1.1, 6.51±6.17 and 2.3±0.5 for male group, 7.97±6.44 and 5.8±6.4 for mixed group respectively. The average group size for the three group categories did not varied seasonally. The age component of Blue Sheep Groups was adults 64.1%, subadults 20.8% and juveniles and 15.1% in early winter, and 78.8%, 16.3%, 4.8% respectively in spring. The ratio of adult female to adult male was 1∶1.57 and 1∶0.73 in spring and early winter. The ratio of adult females to juveniles was 1∶0.16 in spring, which is higher than that (1∶0.56) of in winter.更多还原