Table 1. Spatial predictors used to build the Species Distribution Model with notes on their perceived importance for orangutan and data source.

Name	Class	Description	Relation to orangutan	Source
popdist	Anthropogenic	distance to a major population centre(250000+ people)	population centres are unsuitable habitat and a source of disturbance	SWD
roaddist	Anthropogenic	distance to a main road	roads increase mortality and reduce dispersal	SFD
riverdist	Habitat	distance to a river	rivers are used as dispersal routes and provide native riverine vegetation	SFD
protectarea	Habitat	areas in which logging is prohibited	protected areas will be vital for long-term orangutan persistence	SWD & SFD
elevation	Habitat	meters above sea level	orangutans prefer habitats at lower altitudes	SRTM
slope	Habitat	degrees of inclination from the horizontal	steep slopes are difficult to develop and might provide refuge	SRTM
forest	Habitat	2009–10 forest cover	includes the forest reserves and unprotected forest	CRISP
degraded	Habitat	2009–10 degraded cover	severely degraded vegetation areas including small-scale plantations	CRISP
mangrove	Habitat	2009–10 mangrove cover	considered suboptimal orangutan habitat butless prone to development	CRISP
climate	Climate	mean 1989–2009 annual temperature and monthly wet dry season rainfall	included to quantify orangutan climatic tolerances	CRU TS v3