Taxon name
Hoolock hoolock
(Harlan, 1834)
Uploaded by
National Red List Database
Taxonomic information
Scientific name
Hoolock hoolock
(Harlan, 1834)
Common name(s)
Western Hoolock, Hoolock Gibbon
Assessed taxon level
Species
Higher level taxonomic groupings
Vertebrates
Mammals
Species authority
(Harlan, 1834)
Location and scope
Specific locality or subnational name or regional name
South Asia
Scope (of the Assessment)
Regional (multi-national)
Countries included within the scope of the assessment
Nepal
India
Pakistan
Myanmar
Viet Nam
Thailand
Indonesia
Philippines (the)
Singapore
Country ISO code(s)
NPL
IND
PAK
MMR
VNM
THA
IDN
PHL
SGP
Does the assessment cover a marine EEZ area(s)?
Not_assigned
Conservation Status
Qualifying criteria (if given)
A2abcd+3bcd C1+2a(i)
Criteria system used
IUCN
(see Assessment details)
Assessment rationale/justification
The Hoolock Gibbon is found in around 126 locations and 97 subpopulations in India and Bangladesh, most of which is threatened due to human interference (see under threats). Habitat fragmentation over the years has depleted the area available for this habitat-specific taxon and restricted it to several small pockets that are non-viable. Hunting along with habitat degradation has been observed to reduce the population of Hoolock Gibbon in South Asia by more than 50% in the last 50 years (3 generations) due to continuing decline in extent of occurrence, area of occupancy and quality of habitat along with exploitation of the taxon in the wild. The rate of decline is also predicted to continue at the same level over the next 50 years (3 generations) since more habitat destruction is predicted for human settlements, increasing population, refugee problems, encroachments and hunting. The number of mature individuals is around 440 in South Asia, with no subpopulations having more than 250 mature individuals and a continuing decline of over 20% over 2 generations. The South Asian population is bigger than the few individuals found in Myanmar, hence the status is retained as Endangered.
Assessment details
Assessors/contributors/reviewers listed
Molur, S., D. Brandon-Jones, W. Dittus, A. Eudey, A. Kumar, M. Singh, M.M. Feeroz, M. Chalise, P. Priya and S. Walker (Eds.) (2003). Status of South Asian Primates: Conservation Assessment and Management Plan (C.A.M.P.) Wokshop Report, 2003. Zoo Outreach Organisation, CBSG-South Asia, Coimbatore, viii+432pp.
Criteria system used
IUCN
Reference for methods given
IUCN (2001) IUCN Red List Categories and Criteria: version 3.1. IUCN Species Survival Commission. IUCN, Gland, Switzerland and Cambridge, UK. ii+30pp
URL (link) of redlist assessment or publication
South Asian Primates.pdf
Further information
Endemism (according to assessment)
Endemic to region
Not assigned
Taxon distribution as listed in assessment
Bangladesh, India, Myanmar; For detailed distributional information within South Asia, see Molur et al. 2003
Is there a map available in assessment?
Yes; See Molur et al. 2003
Habitat and systems
Ecological system type
Habitat
Habitat details as listed in assessment
Tropical semi-evergreen forest, tropical moist deciduous forest, subtropical broad-leaved hill forest, mixed-evergreen forest
Threats and conservation measures listed
Threats listed in assessment
Selective logging, firewood and timber collection, jhumming, charcoal production, human settlement, roads, dams, powerlines, fragmentation, soil loss/erosion, deliberate fires, hunting for food, sport, traditional medicine and cultural use, trade, accidental mortality by trapping, unplanned tourism, habitat loss, poor reproduction.
Publication
Molur, S., D. Brandon-Jones, W. Dittus, A. Eudey, A. Kumar, M. Singh, M.M. Feeroz, M. Chalise, P. Priya and S. Walker, editors. 2003. Status of South Asian Primates: Conservation Assessment and Management Plan (C.A.M.P.) Wokshop Report. Zoo Outreach Organisation, CBSG-South Asia, Coimbatore, viii+432pp.