关键词: 黃羊, 集群行为, 羊群類型, 羊群大小

Abstract: The total of 637 groups of Mongolian gazelle(Procapra gutturosa) were observed during April to July，1993 and M ay to July, 1994. The average group size for spring and early summer and standard deviation were calculated. We also compared and analysed the average group size，percentage and stability of the three types of group of Mengolian gazelle．The analysis of these data revealed that the average group size between spring and early summer exists a significant difference(F=3.09> F_0.05)．The average group size，the percentage and stability of types of group were quite different in spring and early summer. In spring mixed group is the main group type(63.14% )，however，female group is the main group typ e (60.73 %)in early summer．In both seasons，the percentage of male group is the low est，7.45 %and 7.59 % respectively．The largest group is usually mixed group， the female group and the male group are smaller comparatively. In spring, the average group size of femal grouP is 11.35，male group8.84. In ear ly summer，the avarage group size of female group is 4.88 ，male group 9.63．T he m ixed group is the unstablest，the male group is the stablest．Birth period, the abundance of food,the types of group are responsible for the difference in group size for spring and early summer．

Key words: Mongolian gazelle (Pr0capra gutturosa), Grouping behavior, Group type, group size