Table 1. Environmental variables used for the final Maxent model.
| Variable a | Type of data | Source | References |
|---|---|---|---|
| Integrated NDVI (indvi)b | Reflectance derived | MODIS-TERRA | [39] |
| Elevation (altitude) | Elevation derived | Aster-DEM | [40] |
| Distance to permanent water (permdist) | Distance metrics | ArcGIS Spatial Analyst extension | [29] |
| Distance to seasonal water (seasdist) | Distance metrics | ArcGIS Spatial Analyst extension | [29] |
| Distance to ephemeral water (ephdist) | Distance metrics | ArcGIS Spatial Analyst extension | [29] |
| Geology (geologyventer)c | Soils | KNP Scientific Services Skukuza | [25, 26, 41] |
| SOTER Soil ID (sotersoilid) | Soils | SOTER database | [27, 28] |
| Land Type (ltypeventer) | Soils | KNP Scientific Services Skukuza | [26] |
| Landscape (landscapegert) | Soils | KNP Scientific Services Skukuza | [26] |
| Calcium (caventer) | Soils | Interpolated from Venter database | [25, 27, 28, 42] |
| Precipitation of driest quarter (preqdryq)d | Climate | Worldclim | [24] |
| Temperature seasonality (tempseasonality) | Climate | Worldclim | [24] |
a Variable name as used in model included in parenthesis
b Measure of overall productivity and biomass as derived through the small seasonal integral of time-integrated NDVI images between 2000–2009 and is not extracted for each case’s time of death.
c Venter [25] classified the soils of Kruger National Park into 15 major classes and described the chemical composition of each.
d Precipitation is the 50 year average 1950–2000 from the Worldclim dataset.