Title
Densities of orang utan nests in Batang Ai National Park, Lanjak-Entimau Wildlife Sanctuary and the proposed Ulu Sebuyau National Park
Author(s)
Gumal, M.; Rubis, J.; Silang, S.; Goyem, C.; Juat, N.; Simba, P.; Ng, S.; Pandong, J.
Published
2007
Abstract
In the last 20 years, several prominent species that have slow disappeared or become locally extinct within Sarawak. These include the Sumatran rhinoceros (Dicerorhinus sumatrensis) and the Banteng (Bos javanicus). With current science and lack of samples for DNA studies, Sarawak will probably not know the distribution and numbers of both these charismatic species as no scientific field studies were done on them, prior to their population collapse. The orang utan (Pongo pygmaeus pygmaeus) represents one of the most charismatic species of animals left in Sarawak and one where their current distribution and numbers are partially known. Whilst enforcement is a major component of any conservation work, there is also a need to monitor their population and distribution with appropriate and credible scientific survey methods. Without field surveys, it would be difficult to ascertain if a species is doing well. Since 2003, several methods of field surveys were conducted to estimate the population of orang utans in Sarawak. The results of the different survey methods are presented, as are the limitations of these methods. Several options for future surveys are discussed. Threats facing the species are also highlighted via a conceptual model.
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PUB25617