Forest Management Plan - Sabah Forestry Department

The aerial surveys are taken about every six months in efforts to establish a long-termtrend in Orangutan populations. The results are subject to a number of elements such asweather conditions, average altitude of flight path over canopy, speed of helicopter andcanopy leaf fall of Laran trees thus, resulting in variable estimates over time and fairlylarge confidence intervals. The results of Orangutan surveys since 2005 are presentedin Table 4.1.Table 4.1: Summarized orangutan nest counts and estimated population density in FMU17ADateTransectLength(km)# NestsCountedAerialIndexNestDensity /km²OrangutanDensity/km²TotalApprox. #Nov 2009 51.37 387 3.77 415.2 1.49 746May 2009 51.37 248 2.41 268.5 0.96 481Nov 2008 16.98 179 5.27 577.1 2.07 467May 2008 51.37 96 0.93 106 0.38 190Nov 2007 16.98 99 2.92 323.1 1.16 262Aug 2007 19.8 82 2.07 231.1 0.83 187Nov 2006 19.8 89 2.25 250.4 0.90 203June 2006 19.8 101 2.55 283.4 1.01 228Nov 2005 19.8 92 2.32 258.6 0.93 210June 2005 19.8 83 2.10 233.8 0.84 189Tangkulap and Sg. Pinangah Forest ReserveTangkulap Forest Reserve onlyCamera trapping is currently being conducted in various parts of FMU 17A under theSFD & Center for Ecological Research Kyoto University Japan research programme. Thepreliminary results from camera trapping over a period of about 400 days in 2006 byHiromitsu Samejima - Center for Ecological Research, Kyoto University showed that thetotal number of records of animals sighted per camera day for Tangkulap FR was 0.105(see Figure 4.1 and Table 4.2). A total of 18 species were recorded for DeramakotForest Reserve and 11 species were recorded in Tangkulap Forest Reserve.Meanwhile, the rare, threatened and endangered species in FMU 17A are listed inAppendix A.26