comprise a total of approximately 7,760 km2 below 1,000 m in elevation.


. Of this 88% is


Te coastal peat swamp areas contain a disproportionate num- ber of orangutans (approximately 31% of the total population) compared to their surface area (approximately 11%), because of


the higher orangutan density in forest on peat in comparison to non-peat areas (van Schaik et al. 1995; Husson et al. 2009). For the purpose of this study one representative area of coastal peat swamps will be highlighted, the Tripa swamps and one area of forests on mineral soils, the Batang Toru area.


Map 6 Ecological zones


Sumatran orangutans occur in two main forest habitats: those on mineral soils and those on peat. The three main peat areas are: Singkil, Kluet and Tripa.


26


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