A detailed survey of Hoolock hoolock was carried out in the Inner-Line Reserve Forest and the adjoining areas of Cachar district of southern Assam, India, from July 2010 to December 2011. About 150 km2 of the area was covered. In direct sighting, groups and individuals were counted in 7 localities (39.7 km2). Only 3.96 km2 of the actual forest area were occupied by these gibbons. Nine family groups and a solitary subadult, 33 individuals in all, made up the total count. Of these, adult males and females comprised 54.5% of the population while the subadults, juveniles and infants comprised 27.3, 12.1 and 6.1%, respectively. Each family group's home range was 0.31-0.51 km2. Of the 7 localities, only 1 had more than 1 family group. Habitat destruction and diverse threats to the hoolock gibbon in this area are examined in this paper.

Keywords:
Hoolock hoolock, Home range, Inner-Line Reserve Forest, Cachar, Assam, India
1.
Ahsan MF (1984). Study on Primates in Bangladesh: Determination of Population Status and Distribution of Non-Human Primates in Bangladesh with Emphasis on Rhesus Monkey. M. Phil. thesis, University of Dhaka.
2.
Ahsan MF (1994). Behavioral Ecology of the Hoolock Gibbon (Hylobates hoolock) in Bangladesh. PhD dissertation, University of Cambridge.
3.
Alfred JRB, Sati JP (1990). Survey and census of the hoolock gibbon in West Garo Hills, Northeast India. Primates 31: 299-306.
4.
Brockelman W, Molur S, Geissmann T (2008). Hoolock hoolock. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2.
5.
Burnham KP, Anderson DR, Laake JL (1980). Estimate of Density from Line Transect Sampling of Biological Populations. Wildlife Monograph 72. Washington, The Wildlife Society.
6.
Choudhury A (1990). Population dynamics of hoolock gibbons (Hylobates hoolock) in Assam, India. American Journal of Primatology 20: 37-41.
7.
Choudhury A (1991). Ecology of the hoolock gibbon (Hylobates hoolock), a lesser ape in the tropical forests of north-eastern India. Journal of Tropical Ecology 7: 147-153.
8.
Choudhury A (1996). A survey of hoolock gibbon (Hylobates hoolock) in southern Assam, India. Primate Report 44: 77-85.
9.
Das J (2002-2003). Hoolock gibbon: flagship species for future conservation in northeast India. Asian Primates 8: 12-17.
10.
Das J, Bhattacherjee PC, Biswas J, Chetry D (2005). Western Hoolock Gibbon: Socioecology, Threats and Conservation Action Plan. Guwahati, Department of Zoology, Guwahati University, and Primate Research Centre, Northeast Centre.
11.
Feeroz MM, Islam MA (1992). Ecology and Behavior of Hoolock Gibbons of Bangladesh. Dhaka, MARC.
12.
Gittins SP (1982). Feeding and ranging in the agile gibbon. Folia Primatologica 38:39-71.
13.
Gittins SP, Tilson RL (1984). Notes on the ecology and behavior of the hoolock gibbon. In The Lesser Apes: Evolutionary and Behavioural Biology (Preuschoft H, Chivers DJ, Brockelman WY, Creel N, eds.), pp 258-266. Edinburgh, Edinburgh University Press.
14.
Gupta AK (1994). Status and conservation of non-human primates in Tripura, India. In Current Primatology (Thierry B, Anderson JR, Roeder JJ, Herrenschmidt N, eds.), pp 101-111. Strasbourg, Université Louis-Pasteur.
15.
Gupta AK, Sharma N, Dasgupta S, Chakraborty D, Hazarika R (2005). Conservation of hoolock gibbon (Hoolock hoolock) in northeast India. In Conservation of Hoolock Gibbon (Hoolock hoolock) in Northeast India (Gupta AK, ed.), pp 1-34. Dehradun, Wildlife Institute of India.
16.
Joseph GK, Ramachandran KK (2003). Distribution and demography of the Nilgiri langur (Trachypithecus johnii) in Silent Valley National Park and adjacent areas, Kerala, India. Primate Conservation 19: 78-82.
17.
Kumar A, Mary PP, Bagchie P (2009). Present distribution, population status, and conservation of Western hoolock gibbons Hoolock hoolock (Primates: Hylobatidae) in Namdapha National Park, India. Journal of Threatened Taxa 1: 203-210.
18.
Mittermeier RA, Ratsimbazafy J, Rylands AB, Williamson L, Oates JF, Mbora D, Ganzhorn JU, Rodríguez-Luna E, Palacios E, Heymann EW, Kierulff MCM, Long YC, Supriatna J, Roos C, Walker S, Aguiar JM (2007). Primates in peril: the world's 25 most endangered primates, 2006-2008. Primate Conservation 22: 1-40.
19.
Molur S, Walker S, Islam A, Miller P, Srinivasulu C, Nameer PO, Daniel BA, Ravikumar L (eds.) (2005). Conservation of Western Hoolock Gibbon (Hoolock hoolock hoolock) in India and Bangladesh: Population and Habitat Viability Assessment (PHVA) Workshop Report, 2005. Coimbatore, Zoo Outreach Organization/CBSG-South Asia.
20.
Mukherjee RP (1982). Survey of non-human primates of Tripura. India. Journal of Zoological Society of India 34: 70-81.
21.
Mukherjee RP (1986). The ecology of hoolock gibbon (Hylobates hoolock) in Tripura, India. In Primate Ecology and Conservation (Else JG, Lee PC, eds.), pp 115-123. Cambridge, Cambridge University Press.
22.
Mukherjee RP, Chaudhuri S, Murmu A (1988). Hoolock gibbons in Arunachal Pradesh, Northeast India. Primate Conservation 9: 121-123.
23.
Mukherjee RP, Chaudhuri S, Murmu A (1991-1992). Hoolock gibbon in Arunachal Pradesh, Northeast India: Lohit district. Primate Conservation 12-13: 31-33.
24.
NRC (1981). Techniques for the Study of Primate Population Ecology. Washington, National Research Council, National Academy Press.
25.
Siddiqi NA (1986). Gibbon (Hylobates Bunopithecus hoolock) in the West Bhanugach reserved forest of Sylhet district, Bangladesh. Tiger Paper XIII: 29-31.
26.
Solanki GS, Chutia P (2004). Ethno zoological and socio-cultural aspects of monpas of Arunachal Pradesh. Journal of Human Ecology 15: 251-254.
27.
Srivastava A, Das J, Biswas J, Buzarbarua P, Sarkar P, Bernstein IS, Mohnot SM (2001). Primate population decline in response to habitat loss: Borajan Reserve Forest of Assam, India. Primates 42: 401-406.
28.
Tilson RL (1979). Behaviour of hoolock gibbon (Hylobates hoolock) during different seasons in Assam, India. Journal of the Bombay Natural History Society 76: 1-16.
29.
Walker S, Molur S, Brockelman WY (2007). Western hoolock gibbon, Hoolock hoolock (Harlan, 1831). Primate Conservation 22: 1-18.
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