Abstract
Pre-release aassessment study of Javan gibbon (Hylobates moloch) in gradually during acclimatization phase in the Mount Malabar Protected Forest, West Java. We studied eleven Javan gibbons in February-March 2014, February-March 2015, March-April 2015, and July-August 2016. The purpose of this study was to assess the readiness of Javan gibbon behavior in acclimatization phase prior to release. Data collection was conducted by focal animal sampling method with 5-minute interval recording time and ad libitum method. The average time allocation of Javan gibbon activities were the following: feeding 16.82±1,28%; moving 20.01±3.14%; resting 47.64±1.31%; socializing 12.88±2.92%; sexual 0.69±0.54%; and vocalizing 1.96±0.59%. We compared activity allocation data from this study and those from wild Javan gibbons and found similarities as follows: 55.30% at a family of Jowo-Bombom-yani-Yudi, 51.42% at a pair of Moly-Nancy, 44.57% at a pair of Robin-Moni and 62.19% at a family of Mel-Pooh-Asri. Based on readiness assessment of 11 Javan gibbons, 3 were considered almost ready for release, while 8 individuals were considered ready.
Highlights
The rehabilitation program of Javan gibbon (Hylobates moloch) established since 2003 at the Javan Gibbon Centre (JGC), located inside of the Mount Gede Pangrango National Park
Javan gibbon daily activity in acclimatization phase was recorded to begin in the morning at 6:00 a.m. and ended at 16:00 p.m
Acclimatization is an important process that must be done for the Javan gibbons that will be released
Summary
The rehabilitation program of Javan gibbon (Hylobates moloch) established since 2003 at the Javan Gibbon Centre (JGC), located inside of the Mount Gede Pangrango National Park. The aim of the centre is to rehabilitate ex-captive Javan gibbons, returning them to full physical, psychological health, behaviour, with a view to releasing suitable pairs and family groups into suitable protected habitat. Reintroduction program of Javan gibbon begin since 2009, established since 2013 in Mount Malabar Protected Forest. After transferred to release site, the Javan gibbons required acclimatization phase. All pre-release gibbons should ideally spend some time acclimatizing to a semi-natural environment (or half-way house). Gibbons should never be released immediately after transport to Jurnal Ilmu Lingkungan (2019), 17 (2):189196 ISSN 1829-8907 the release area: time is required to recover from the stress of the trip and for acclimatization. Gibbons should be released into an enclosed environment, where they cannot migrate and where observers can monitor the gibbons (Strum & Southwick 1986)
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