高原鼠兔在不同植被覆盖的立地占域、局部灭绝和建群率

The Site Occupancy,Colonization and Local Extinction Rate of Plateau Pikas Ochotona curzoniae in Relation to Vegetation Cover

青藏高原的草地生态系统被野生动物和家畜广泛地利用。大型有蹄类动物的放牧和小型哺乳类动物的挖掘行为,会改变其栖息地的植物群落。基于拉萨市墨竹工卡县日多镇年村牦牛(Bos grunniens)放牧的实践,我们发现高原鼠兔(Ochotona curzoniae)立地占域率、建群和区域灭绝率与栖息地变量之间存在一定的格局关系。为了了解高原鼠兔立地占域率、建群和区域灭绝率与栖息地之间的关系,我们采用多季节性立地占据模型,利用Presence软件对相关数据进行分析。结果表明,高原鼠兔局部灭绝率与植被覆盖度之间存在正相关性,而与建群率之间则呈负相关性。

The steppes of the Qinghai-Tibetan Plateau are widely used by both livestock and wildlife. Both the grazing of large ungulates and the burrowing of small mammals modulate habitats used by other species. The study was conducted in Medrogongka County, Lhasa prefecture Tibetan Autonomous Region. We applied the single-species, multi-season occupancy models to explore the relationship between site occupancy by plateau pikas and habitat variables based on yak grazing, including the extinction and colonization rate of pikas. To accomplish this, the multi-season occupancy model was used with the program PRESENCE. Findings showed that there was a positive relation between vegetation cover and pika extinction rate, but a negative relation between vegetation cover and pika colonization.