Forest Structure Analysis as Support for Orangutan’s Positional Behavior in Juq Kehje Sewen Island, Eastern Kalimantan

• Main Author: Nur Feranti (11514031), Salsabilla
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30782
• Institution: Institut Teknologi Bandung

Bornean orangutan is one of primate that has 'critically endangered' conservation <br /> <br /> status and declined population because of habitat reduction and illegal hunting. <br /> <br /> Flock of endangered orangutans currently live in rehabilitation location on Juq <br /> <br /> Kehje Sewen Island, Eastern Kalimantan. Trees needed for support positional <br /> <br /> behavior has not yet known for determining the success of orangutan’s <br /> <br /> rehabilitation. This research aims to identify positional behavior of rehabilitant <br /> <br /> orangutan, determine preference support of positional behavior, determine <br /> <br /> composition, structure, and carrying capacity of Juq Kehje Sewen Island. <br /> <br /> Composition was determined using analysis vegetation, structure was determined <br /> <br /> by using profile diagram with sample plot of 10x60m2 and analyzed using SeXIFS. Behavior, daily range, and daily home range was determined using focal animal <br /> <br /> sampling method and daily home range was analyzed using Minimum Convex <br /> <br /> Polygon using ArcMap 10.1. Comparison of positional behavior with wild <br /> <br /> orangutans was analyzed using non-parametric statistical test which is Wilcoxon <br /> <br /> Rank Test (&#945; = 5%). Support preference for positional behavior was determined by <br /> <br /> marking and measuring diameter every support (lianas and trees) that was used by <br /> <br /> orangutan then analyzed using Jacob’s D preference index. Orangutan’s traveling <br /> <br /> behavior has not shown any compatibility in terms of usage of each mode of <br /> <br /> locomotion and height. Characters of preference trees are DBH &#8805; 4 cm and liana &#8805; <br /> <br /> 4 cm, and the most preference species is Ficus racemosa (value of Jacob’s D Index <br /> <br /> is +0,89). Structure of Juq Kehje Sewen Island has not been able to support traveling <br /> <br /> behavior and estimated can only support two rehabilitant orangutans or one wild <br /> <br /> orangutan.