石鸡繁殖期栖息地的特征

2005年4~7月,对甘肃西部(东阿尔金山地区和西祁连山地区)和东南部(西秦岭地区)的石鸡(Alectoris chukar)种群栖息地选择进行了调查。主成分分析表明,草本密度、地面异质性和草本盖度是栖息地选择的主要影响因子;方差分析表明,甘肃西部(东阿尔金山和西祁连山)的石鸡种群在海拔、坡度和小石块数目的选择上差异显著。甘肃西部和东南部的石鸡种群在栖息地选择上存在显著的地理变异,西秦岭种群选择海拔低、坡度大、坡位偏上、草本密度低和草本高度高的栖息地。栖息地选择差异可能是在不同的选择压力下,经过长期的隔离进化形成。

Habitat Feature of Chukar Partridge Used during Breeding Season

Habitat feature of Chukar Partridge(Alectoris chukar) used during breeding season was investigated in the western(east Aerjin Mountain and west Qilian Mountain) and southeastern Gansu(west Qinling Mountain) from April to July in 2005.Parameters taken from the habitat location in which birds were found were analyzed by principle components analysis.The result showed that density of grasses,heterogeneity of ground environments and cover of grasses were the major factors for Chukar Partridge to use those habitat sites.Significant differences were found in altitude,slope degree and number of small stone between habitat sites used by the bird populations in east Aerjin Mountain and west Qilian Mountain.There feature of habitat sites used by birds in eastern and western Gansu were also significant differences Chukar Partridge in west Qinling Mountain preferred to use habitat at lower altitude,more steep slope,upper position on slope,lower density of grasses and higher height of grasses.Geographical variation might result from the historical isolation under the different selective press.