Table 1.
Potential predictor variables of home range, group size and mating system in gibbons: potential intrinsic and extrinsic predictor variables (fixed effects) hypothesised to influence response traits and tested in predictive models, with data scale and source(s)
| Potential predictor variable | Scale | Source(s) |
|---|---|---|
| Adult body mass (kg) | Species mean | [9, 50, 51, 86, 87] |
| Group density (mean number of groups/km2) | Mean at site | Details in Additional file 1 |
| Latitude (decimal degrees) | Exact value for site | Details in Additional file 1 |
| Longitude (decimal degrees) | Exact value for site | Details in Additional file 1 |
| Altitude (metres asl) | Mean for site across years, 1 km resolution | [88], extracted in ArcMap V.10.0 (ESRI 1999–2010); site location used to derive standardised mean values per site |
| Annual mean temperature (°C) | Mean for site across years, 1 km resolution | |
| Annual precipitation (mm) | Mean for site across years, 1 km resolution | |
| Precipitation seasonality (coefficient of variation) | Mean for site across years, 1 km resolution | |
| Normalized difference vegetation index (NDVI; ratio) | Mean for site across years, 8 km resolution | [89] |
| Global Human Footprint (GHF; %) | Mean for site across years, 1 km resolution | [43] |
| Reserve area (km2) | Value for reserve | Details in Additional file 1 |