Occupancy data

Burrow occupancy was estimated using ground-based methods. We used 25 quadrants of 20 m x 20 m randomly selected. Each corner was marked with wooden stakes and locations recorded with GPS. We separated the quadrats in three categories ,based on burrow density. Burrows were monitored in April, May, and June 2016, and June 2017, and occupancy was estimated using toothpicks placed at the entrance of the burrows. We monitored 1,342 burrows with toothpicks.本研究采用地面调查法估算洞穴占有率。我们随机选取了25个20 m × 20 m的样方，每个样方的四角均以木桩标记，并通过全球定位系统（GPS）记录样方位置。根据洞穴密度将所有样方划分为三类。分别于2016年4月、5月、6月及2017年6月对洞穴开展监测，通过在洞穴入口处放置牙签的方式估算洞穴占有率。本次研究共通过牙签法监测了1342个洞穴。