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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)

From: Identifying environmental versus phylogenetic correlates of behavioural ecology in gibbons: implications for conservation management of the world’s rarest ape

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