Availability and Use of Orangutan Resting and Nesting Trees in Juq Kehje Sewen Island, Muara Wahau, Kalimantan Timur

• Main Author: Okkianty Yudha (11514027), Rizdha
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30562
• Institution: Institut Teknologi Bandung

Bornean orangutan (Pongo pygmaeus morio) is a Great Asian Apes distributed in East Borneo, <br /> <br /> North Borneo, and Sabah (Malaysia). Nowadays, due to illegal hunting and land conversion, <br /> <br /> the IUCN of P.p morio conservation status is critically endangered. Rehabilitation and <br /> <br /> introduction is one of conservation actions to prevent extinction. Juq Kehje Sewen Island <br /> <br /> inhabited by 9 rehabilitant orangutans. Resting and nest building are basic skills which <br /> <br /> orangutan needs before they are released. This study aims to determine time allocation of <br /> <br /> resting and nest building, composition, preference, and carrying capacity based on resting and <br /> <br /> nesting tree of orangutans in Juq Kehje Sewen Island. Time allocation is determined by focal <br /> <br /> animal sampling, composition determined by vegetation analysis, the preference determined <br /> <br /> by Neu method which based on diameter, architectural type, and spesies name. Meanwhile, the <br /> <br /> carrying capacity is determined by the availability and the needs of resting and nesting tree in <br /> <br /> the island. The resting percentage showed 43,96% and the nest building is 0,24%. The highest <br /> <br /> density of resting and nesting tree provide by the 10 – 20 cm diameter trees which showed the <br /> <br /> 9,67% percentage and Pterospermum javanicum with the 5% lowest density. The resting and <br /> <br /> nesting tree preferences are represented by the more than 10cm-diameter of Dracontomelon <br /> <br /> dao and Pterospermum javanicum trees. And also supported by the Rauh architectural type, <br /> <br /> such as Pterospermum javanicum species tree. The carrying capacity of the resting and nesting <br /> <br /> tree are 8 individuals for orangutan- rehabilitant or 4 individuals for the wild-orangutan, it is <br /> <br /> caused by the less of availability and use of resting and nesting tree orangutan rehabilitation in <br /> <br /> Juq Kehje Sewen Island.