黑头噪鸦的活动区、种群密度和栖息地利用

黑头噪鸦(Perisoreus internigrans)是我国青藏高原高山针叶林的特有鸟类,种群数量稀少,一些基本生活史资料至今依然缺乏.我们于2001-2004年间对该物种在卓尼和九寨沟地区的种群状况和栖息地选择进行了研究.研究表明黑头噪鸦通常以平均3.8只个体构成的“群体”形式活动,平均家域大小为42.0 ha,...

Home range, population density, and habitat utilization of the Sichuan Jay (Perisoreus internigrans

We assessed habitat preference and population status of the Sichuan Jay (Perisoreus internigrans),a poorly known Chinese endemic bird,at two sites (Zhuoni and Jiuzhaigou) in the Qinghai-Tibetan plateau between 2001 and 2004.Mean group size was 3.8 jays.Each group occupied a mean home range of 42.0 ha during the breeding season,and the mean internest distance was 2.7 km.These data indicated that the jays used less than ten percent of the available habitats and occurred at an overall density of only 0.6 jays per km2.Radio-tracked Sichuan Jays had a strong preference for mature montane coniferous forests and avoided areas dominated by shrubs,while the utilization of young conifers,grassland,and human residential habitat types did not differ significantly from the values expected from the home-range availabilities of these habitats generally.