The Tuanan Orangutan Research Station (2o09’ S and 114o26’ E) is located in Central Kalimantan, Indonesia. Tuanan comprises 900 ha of peat swamp forest with a peat depth of 1-2 m in most parts (overall depth of ≤ 3.5 m), and is located in the 3,090 km2 Mawas Conservation Area, along the Kapuas Murung River. The study area is recovering from selective commercial logging in the 1990s and subsequent illegal logging until the early 2003. While the majority of the Mawas Conservation Area is similarly ombrotrophic, the Tuanan research station is located in a seasonally rheotrophic part of the area, with both shallower peat and a more alluvial flooding regime, and thus receives nutrients from seasonal river flooding, in addition to aerial precipitation.
Tuanan’s orangutan population density is estimated to be between 4.3-4.5 individuals/km2 [Husson et al. , 2009; van Schaik et al. , 2005], among the highest in Borneo [Husson et al., 2009]. We have collected behavioral data as part of the research project on over 70 identified individuals. We have been collecting data on orangutans continuously since 2003 and have accumulated over 60,000 hours of focal data on orangutans.
CORE BORNEO 