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Table 2 Data sources and description of variables used in MaxEnt to model the habitat use of Snow Partridge (Lerwa lerwa) at Balangshan mountains on the eastern Qinghai-Tibetan Plateau, Sichuan Province, China

From: Post-breeding habitat association and occurrence of the Snow Partridge (Lerwa lerwa) on the Qinghai-Tibetan Plateau, west central China

Variable Description
Land cover type Classified based on 30 m resolution Global Land Cover (Globeland30-2010) from National Geomatics Center of China (http://www.globallandcover.com/) and include cultivated land, forests, grassland, shrubland, wetland, waterbodies, tundra, artificial surfaces and permanent snow and ice
Terrain
Elevation Elevation above sea level, obtained from http://www.gscloud.cn/
Slope Extracted from a 30 m × 30 m digital elevation map (DEM), downloaded from http://www.gscloud.cn/
Aspect Extracted from a 30 m × 30 m digital elevation map (DEM), downloaded from http://www.gscloud.cn/ and reclassified into 8 direction codes: North 1, Northeast 2, East 3, Southeast 4, South 5, Southwest 6, West 7 and Northwest 8, by 45° from 0° to 360° clockwise, with 0° and 360° both indicating due north. Aspect as a categorical environmental layer with 8 categories, used in MaxEnt
Distance
Distance to ridge Ridge map drawn based on ridgelines extracted from a 30 × 30 m digital elevation model (DEM) following the method of hydrological analysis (Tang and Yang 2006). Distance to ridge is the distance from the locations to the nearest ridge