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12d的野外跟踪观察,发现该岩羊群昼间的活动范围基本上在1.47km^2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。
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 subadult 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.
出处
《动物学杂志》
CAS
CSCD
北大核心
2006年第4期53-59,共7页
Chinese Journal of Zoology
关键词
岩羊
种群结构
生态行为
年龄组成
甘肃
东大山自然保护区
Blue Sheep (Pseudois nayaur)
Population structure
Ecological behavior
Age structure
Gansu
Dongdashan Nature Reserve