关键词: 鬣羚, 栖息地选择, 季节性变化

Abstract: A study on the habitat selection and its seasonal change of serow was conducted in Cibagou Nature Reserve of Zayu ,Tibet from December 2001 to August 2002. 14 line transects perpendicular to contours were set out along the valley , From bottom to upper position , sampling plots (10 m ×10 m) were set every 250 m apart , and 187 plots were made in total. The vegetation types , elevations , slope gradients , canopy covers , shelters and distances fromwater of these plots were recorded. These plots were examined repeatedly to record whether plots were used by the serow recently in winter , spring and summer respectively. Ivlev's Selectivity Index was used to evaluate the selectivity of serow to vegetation and elevations. The frequency of utilization was used to analyze other factors. It was found that serow mainly selected coniferous forest in the winter , and mostly selected Theropencedrymion forests and secondly Fargesia-coniferous forests in the spring. In the summer , serows selected forests with extended ranges , which included theropencedrymion , Fargesia-coniferous forests , and Rhododendron-coniferous forests. In Cibagou Nature Reserve , serow's selection for vegetations correlated significantly with that for elevations ( P < 0.01). We have also found that vegetation and elevation have approximate influence on the distribution of serow. These change of serow's electivity in vegetation types and elevations in different seasons were mainly attributed to the seasonal change of food resource. In the winter and spring , serows mostly utilized flat and slow slopes , while they used steeper slopes in the summer , which was significantly different from winter and spring statistically , and the difference of utilization of slope position in different seasons could account for these change. Serow's utilization for shelter , concealment condition and distance from water did not been influenced significantly by the seasonal change. Serows mostly utilized the places with medium shelter , highest concealment condition , or near water source ,which probably mainly relate to body size and isolated life of serow and distribution of these ecological factors.

Key words: Serow ( Capricornis sumatraensis), Habitat selection, Seasonal change