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 | |
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 |