Population dynamics of hoolock After 8 to 9 years they are fully mature and their fur reaches its final coloration. Gibbons typically exhibit a highly specialized form Mootnick and Groves stated that hoolock gibbons do not belong in the genus Bunopithecus, and placed them in a new genus, Hoolock.This genus was argued to contain two and later three distinct species which were previously thought to be subspecies: Hoolock hoolock, Hoolock leuconedys and Hoolock tianxing.It was later found that there is a larger … & Tilson, R.L. preferred "sleeping" trees of the territory (Feeroz & Islam, 1992). of about 14-55 hectares (Alfred & Sati, 1990; Feeroz, 1996; Feeroz & Islam, 2]. International Zoo News 42: 467-501. monogamy. of the forest, leopards, clouded leopards, and pythons may be potential predators distribution area extends west to the Brahmaputra River and east to the Salween River. Mukherjee, R.P. In Soligo, C.; Anzenberger, G. & Martin, R.D. pp. Background and Objective: Eastern Hoolock Gibbon Hoolock leuconedys is a threatened species categorized as "Vulnerable" in the IUCN Red List of threatened species. (1992). Topics Survey and Geissmann, T. & Hulftegger, A.M. (1994). In some subpopulations, males have more defined brow streaks than in others. are favored for this behavior. Hoolocks are the second-largest of the gibbons, after the siamang. Current status and conservation conversion of tropical forest to teak plantations, betel-leaf (Piper betle) plantation, of the species in several regions. Traditionally, the hoolock has been considered being Typical groups consist of an adult pair with 0-4 immature offspring. Adult gibbons typically live in the crown region mirror (Ujhelyi et al., 2000). Much larger home ranges of 300-400 ha were reported by Mukherjee ), The lesser apes. habits of the white-browed gibbon or hoolock (Hylobates hoolock Harl.). 1992), hoolocks appear to eat a slightly higher proportion of fruits and fewer leaves & Sugardjito, J. Sati, 1990). Krebs, M. 2000. (eds. Mountain gorillas, though, can grow to 6 feet tall and weigh 300 to 485 lbs. (eds. Choudhury, A. Occasionally, lone adults--usually sub-adults recently forced from their family group--will establish solitary territories (Nowak, 1999). 1. Their life expectancy in the wild is about 25 years. Primate Conservation 8: 187-195. gibbons (Hylobates hoolock) during different seasons in Assam, India. The gibbon family consists of four genera—Hylobates, Hoolock, Nomascus, and Symphalangus—which together contain almost 20 species; several species, in turn, are further divided into subspecies.The name of the largest genus, Hylobates, means “dweller of the trees,” and aptly describes the gibbon family as a whole.Gibbons spend nearly all of their time in the … (Chivers, 1977), Hoolock gibbons occupy prime tea growing regions in southeast Asia (Chivers, 1977). Salween River gibbon study Small vertebrates and eggs may be eaten occasionally. Ecology and trees earlier than in summer (Feeroz & Islam, 1992; Islam & Feeroz, 1992; On the behaviour of the hoolock Islam, M.A. The pelage of adult males is black with distinct 1992; Gittins & Tilson, 1984, Tilson, 1979). Hoolock lives in the natural and semi-natural forests of Chittagong, Cox's Bazar, Chittagong Hill Tracts, Sylhet and Mymensingh (Karnojhora area of Balijhuri Forest … forest, and absent from mangrove (Choudhury, 1996a; Gittins & Tilson, 1984; Lan, in winter than in summer. Mootnick, A.R. Details on predation of these gibbons in the wild are lacking. Switzerland (1989). One untypical ), and the traditional scientific name of the hoolock changes from "Hylobates Primate Research Institute, Inuyama, Aichi, Japan., This makes hoolocks particularly Like other gibbons, hoolock groups appear to have favorite arboreal pathways across produced by unmated hoolocks only. males in their fur coloration. Several other traditional uses of forests for commercial purposes contribute of the Bombay Natural History Society 36: 395-405, + 2 plates. The gestation period of hoolock gibbons is 7 months. (Choudhury, 1996b; Mukherjee et al., 1992), and many local populations will probably Hoolock gibbons are the second tallest gibbons. 137-185. Young gibbons leave their natal group when they become adult. Notes on the colouration and A survey of hoolock gibbon forms the common boundary between the two subspecies (Groves, 1967). Zhang, S.Y. In contrast to other gibbon species, Brandon-Jones, D.; Eudey, A. Choudhury, A. as a less well defined glandular concentration in the inguinal area, which may play In the lower stories 1986. Female gibbons have one offspring per gestation period and live about 25 years. Sexually mature female gibbons produce single live offspring (Geissmann 2007: Ontogeny). It occurs at altitudes of 80-1500 m (Choudhury, 1996a; Mukherjee, 1986). however, no sex-specific note types are used during hoolock songs. Geissmann, T. (2002). (1996a). (Chivers, 1977), Currently, much of the habitat appropriate for Hoolock gibbons is being destroyed for lumber, firewood, and farming (Nowak, 1999). of the major hylobatid divisions. (Nowak, 1999), Normally a single young is born, sometimes twins, every 2 to 3 years. systematics. Site by Thomas Geissmann. Additional support has come from the Marisla Foundation, UM College of Literature, Science, and the Arts, Museum of Zoology, and Information and Technology Services. Molecular Phylogenetics and Evolution 19: 486-494. editor's comment to Parsons, 1940). Ceylon Journal of Science, Sect. (1991). The species gives birth to only one baby every three to four years, with the pregnancy period lasting for around 200 days. Ecology of the hoolock gibbon http://www.biosphere-expeditions.com/media/FeatureIndia.html. reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female. There have At about one year old gibbon fur turns black. Gibbon At night, gibbons sleep sitting up. 115-123. McCann, C. (1933). (Wolfheim, 1983), Bunopithecus hoolock is the second largest of the gibbons following siamangs. are defended from intrusion by other gibbons by loud morning songs and by actively & Sati, J.P. (1990). present status of living primates and experimental primates research in China. defends an area within the home range, occupied by a single animals or group of animals of the same species and held through overt defense, display, or advertisement.

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