Table 1.
Environmental variables used for species distribution modeling (see electronic supplementary file S2).
| Variable (abbrev.) | Ecology | Units | Value range | Source |
|---|---|---|---|---|
| Elevation (elev) | Topography | m | (−74.91, 4066.31) | ASTER GDEM |
| Slope (slope) | Topography | radians | (0, 0.52) | terrain function in R package raster |
| Absolute depth to bedrock (d2b) | Soil | cm | (0.00, 65155.67) | SoilGrids106 |
| Bulk density of fine earth (bd) | Soil | kg/m3; depth: 30 cm | (1037.29, 1749.79) | SoilGrids |
| Coarse fragment volume (cfv) | Soil | percent (%); depth: 30 cm | (0.00, 62.11) | SoilGrids |
| Wettest quarter mean temperature (Nov–Jan) (bio8) | Climate | °C | (−7.96, 33.20) | WorldClim v2107 |
| Driest quarter mean temperature (April–June) (bio9) | Climate | °C | (−4.17 33.01) | WorldClim v2 |
| Wettest quarter mean precipitation (Nov–Jan) (bio16) | Climate | mm | (19.0, 556.3) | WorldClim v2 |
| Driest quarter mean precipitation (April–June) (bio17) | Climate | mm | (0.00, 116.55) | WorldClim v2 |
| Vegetation coverage during the summer (June 2006) (vegS) | VegetationS | NDVI | (−0.20, 0.86) | eMODIS |
| Vegetation coverage during the winter (Feb 2005) (vegW) | VegetationW | NDVI | (−0.19, 0.93) | eMODIS |
Elevation and vegetation data were downloaded from https://earthexplorer.usgs.gov; soil data were downloaded from https://www.soilgrids.org; and climate data was downloaded from http://www.worldclim.org. ASTER: Advanced Spaceborne Thermal Emission and Reflection Radiometer, GDEM: Global Digital Elevation Map, eMODIS: EROS Moderate Resolution Imaging Spectroradiometer, NDVI: Normalized Difference Vegetation Index.