生物多样性 ›› 2003, Vol. 11 ›› Issue (1): 59-62.  DOI: 10.17520/biods.2003008

• 论文 • 上一篇    下一篇

矮岩羊种群生态的初步研究

王淯1,2,王小明2   

  1. 1 (内江师范学院,四川内江 641000)
    2 (华东师范学院,上海 200062)
  • 出版日期:2003-01-20 发布日期:2003-01-20

Population ecology of dwarf blue sheep ( Pseudois schaeferi )

WANG Yu1,2,WANG XiaoMing2   

  1. 1 Neijiang Normal College,Neijiang 641000
    2 China East Normal university,Shanghai 200062
  • Online:2003-01-20 Published:2003-01-20

摘要: 利用路线调查方法分别于1998年3月、7~8月和2000年5~8月对四川省巴塘县的矮岩羊(Pseudois schaeferi,亦称倭岩羊)种群进行了初步研究。结果显示,矮岩羊目前主要栖息在巴塘县竹笆笼到苏阿龙一带的河谷以及支流两侧地势陡峭的悬崖绝壁上的岩壁草丛中,在面积大约200 km2的范围内活动,种群数量大约在141只左右,活动群体的大小为2~10只,种群平均密度为0.705只/km2,种群雌雄性比为100:70.4。幼体组、亚成体组、成体组分别占所观察到总数量的13.0%、29.8% 和 57.2%。矮岩羊生性胆小,易受惊吓,休息时喜欢用前脚刨地,这个动作约占休息时间的1/3。从20世纪50年代以来,矮岩羊的种群数量下降很快,森林面积的锐减、人为猎杀、过 度放牧是影响矮岩羊生存环境和种群数量的主要原因。

AbstractDwarf blue sheep (Pseudois schaeferi), currently listed as Endangered (A2d, B1 + 2e) by IUCN (1996, 2000), only occur in China, but little is known about them. In order to protect this rare species, in March and July to August in 1998 and May to August 2000, we studied its population with the line transect method in Batang County, Sichuan Province, China. Eight line transects were set in six villages and each line transect was more than three kilometers in length. The results show that, in Batang County, most of the dwarf blue sheep inhabit the steep, arid, and lower slopes of the Yangtze River, from Sowalong to Zhubalong, with an area of about 200 km2. There are about 141 individuals in Batang County. The group size is from 2 to 10 individuals, and average group size is 3.85±1.99. The density of the population is 0.705 individurals/km2 In this survey, 44(33.6%) females and 31(23.7%)males were found. Another 56(42.7%)individuals were unidentified. The sex ratio was 100:70.4. In fieldwork, only three age groups could be confirmed: young, subadult and adult. We found 17 young, 39 subadults and 75 adults during our survey,representing respectively 13.0%, 29.8%, 57.2% of the total. The species is very timid and wary. They dig the ground usually with their forelimbs to rest, and this behavior accounted for one third of their rest time during our survey. Both number and habitat of dwarf blue sheep declined rapidly from the 1950s, because of the sharp drop in forest cover, over hunting and grazing by domestic stock.