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

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

ISSN: 2730-7182