【摘要】 2004年7月和8月,通过样线调查、野外直接跟踪观察和瞬间取样的方法,对东大山自然保护区岩羊(Pseudois nayaur)的种群结构和生态行为进行了初步研究。在观察到的720只岩羊中,719只组成了50个群,最大的群82只,最小的群2只,平均群大小(14.38±15.83)只(n=50)。雌雄性比为1∶0.63,成年雌体、亚成体和幼体之比是1∶0.4∶0.24。岩羊的昼间活动中,上午和下午各有一个瞬间觅食高峰,分别在6:30时和15:30时,中午有一段较长时间的休息期。通过对一个46只岩羊群连续12 d的野外跟踪观察,发现该岩羊群昼间的活动范围基本上在1.47 km2内。对152个自然死亡的雄性岩羊头骨的分析表明,东大山雄性岩羊的自然死亡年龄在7.5~11.5龄,其中9.5龄是其自然死亡的高峰。更多还原

【Abstract】 Population structure and ecological behavior of the Blue Sheep(Pseudois nayaur) in Dongdashan Nature Reserve,Gansu Province of China,were observed with a modified focal and instantaneous sampling method from 12 July and 26 August 2004.Total of 720 Blue Sheep were accumulatively observed.The average herd size was 14.38±15.83(n=50,range 2-82).The ratio of adult females to males was 1∶0.63,and the ratio of adult females to sub-adult to young was 1∶0.40∶0.24.The Blue Sheep showed two instantaneous peaks of feeding activity in early morning(6:30) to afternoon(15:30) respectively.A resting time occurred around noon(12:00-14:00).The active range of a group with 46 individuals was as large as 1.47 km~2 in a period of 12-days at the study area.Based on the analysis of 152 male skulls,the majority of dead males occurred when they are 7.5-11.5 years old,with a peak of 9.5 years old.更多还原