Estimasi Kepadatan Populasi Orangutan Sumatera (Pongo Abelii Lesson, 1827) Berdasarkan Jumlah Sarang di Restorasi Halaban Taman Nasional Gunung Leuser

Abstract

The Sumatran orangutan (Pongo abelii) was a Sumatran endemic primate that was critically endangered. Halaban National Park at Gunung Leuser was habitat of Sumatran orangutan. The density of orangutan in their ecosystem was varies depending on their ecosystem. Research was conducted to estimate population density of Sumatran orangutan based on their nests. This survey was conducted during February 2023. The methods used was Line Transect method with 3 transects. Results showed 13 of orangutan nests were found with population density of 1.215 ind/250 ha. The nests were dominated by C class signed by brownish color at their nest materials. The presence of orangutan nests were dominated at the tip of the trees (site III) followed by at the middle of branches (site II). The height of tree with nests was mostly found at 15-20 meters. Species of three in which orangutans most often used used nesting were Syzygium polyanthum (Wight) Walp and Macaranga gigantean (Rchb.f and Zoll.) Mull. Arg.