Hylobates muelleri

PROTECTED STATUS: CITES - Appendix I as Hylobates spp. and U. S. ESA - Endangered as Hylobates spp. (including Nomascus spp.).

Sumber: Order Primates

DISTRIBUTION: Borneo from the N. bank of the Kapuas River clockwise around the island to the E. bank of the Barito River.

Sumber: Order Primates

Habitat. Primary and secondary semi-deciduous monsoon, dipterocarp, and tropical evergreen forest. Miller's Gibbons can tolerate a degree of selective logging if sufficient tall, fruit-bearing trees remain. Hybrid H. mueller: x H. albibarbis (Bornean Whitebearded Gibbon) have been studied by K. McConkey at Barito Ulu, in the Barito River watershed, Central Kalimantan, where the terrain is described as rugged (hilly to mountainous). There, dipterocarp forest predominates, interspersed with heath forest. The dry season is from July to September and the wet season is between October and January, with a mean annual rainfall of 3738 mm.

Sumber: Hylobatidae

Movements, Home range and Social organization. Two groups studied at Barito Ulu comprised a single adult pair with a subadult and a juvenile or infant. They occupied home ranges of 43 ha and 46 ha. About 88 % of the home range is defended as a territory for the exclusive use of the resident group. Although generally monogamous, polygynous pairings have been reported in the H. muelleri x H. albibarbis hybrid zone. Other aspects of their social organization and ranging are probably very similar to the East Bornean Gray Gibbon for which some information is available from the study of D. Leighton at Kutai National Park.