Primates

, Volume 49, Issue 1, pp 50–56

Density and population estimate of gibbons (Hylobates albibarbis) in the Sabangau catchment, Central Kalimantan, Indonesia

  • Susan M. Cheyne
  • Claire J. H. Thompson
  • Abigail C. Phillips
  • Robyn M. C. Hill
  • Suwido H. Limin
Original Article

DOI: 10.1007/s10329-007-0063-0

Cite this article as:
Cheyne, S.M., Thompson, C.J.H., Phillips, A.C. et al. Primates (2008) 49: 50. doi:10.1007/s10329-007-0063-0

Abstract

We demonstrate that although auditory sampling is a useful tool, this method alone will not provide a truly accurate indication of population size, density and distribution of gibbons in an area. If auditory sampling alone is employed, we show that data collection must take place over a sufficient period to account for variation in calling patterns across seasons. The population of Hylobates albibarbis in the Sabangau catchment, Central Kalimantan, Indonesia, was surveyed from July to December 2005 using methods established previously. In addition, auditory sampling was complemented by detailed behavioural data on six habituated groups within the study area. Here we compare results from this study to those of a 1-month study conducted in 2004. The total population of the Sabangau catchment is estimated to be about in the tens of thousands, though numbers, distribution and density for the different forest subtypes vary considerably. We propose that future density surveys of gibbons must include data from all forest subtypes where gibbons are found and that extrapolating from one forest subtype is likely to yield inaccurate density and population estimates. We also propose that auditory census be carried out by using at least three listening posts (LP) in order to increase the area sampled and the chances of hearing groups. Our results suggest that the Sabangau catchment contains one of the largest remaining contiguous populations of Bornean agile gibbon.

Keywords

Bornean agile gibbonPopulation densityQuadrangulation samplingSabangau catchmentPeat-swamp forest

Copyright information

© Japan Monkey Centre and Springer 2007

Authors and Affiliations

  • Susan M. Cheyne
    • 1
    • 2
    • 5
  • Claire J. H. Thompson
    • 1
  • Abigail C. Phillips
    • 3
  • Robyn M. C. Hill
    • 4
  • Suwido H. Limin
    • 1
  1. 1.Centre for the International Cooperation in Management of Tropical Peatlands (CIMTROP)Kampus UNPAR, Tunjung Nyaho, Jalan Yos Sudarso Palangka RayaCentral KalimantanIndonesia
  2. 2.Department of AnthropologyGeorge Washington UniversityWashington DCUSA
  3. 3.Department of Biology and Environmental ScienceUniversity of SussexFalmer, BrightonUK
  4. 4.Department of Biological AnthropologyUniversity of CambridgeCambridgeUK
  5. 5.Wildlife Conservation Research Unit, Zoology DepartmentOxford UniversityAbingdon, OxfordshireUK