Biology
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Very little is known of the biology of the Nilgiri langur. Young are born mainly in May and November, after the monsoons that bring fresh leaf growth. This langur species form groups with one male and up to 23 females and young, who move through the forest eating the leaves of 102 plant species as well as some of their fruit, flowers and seeds. As sub-adults, males begin to fight for access to females, but are then displaced by the dominant male and forced to migrate in all-male groups (3).
Conservation
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The Nilgiri langur is found in many wildlife sanctuaries in southwestern India, and international trade in this species is limited (1). The Wildlife Institute of India suggests that it should be obligatory for the government to restore degraded forests, including the cardamom plantations that have been abandoned following the expiration of the lease. Regular patrolling of forest is necessary to enforce protection of the Nilgiri langur (3).
Description
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The Nilgiri langur has a glossy, dark brown coat and long, thick golden to brown fur on the head. The rump and the start of the tail are highlighted with white, and females have white areas on their inner thighs, obvious from a week old. At birth, the young have pale pink skin and dark red fur, with full adult colouration being attained at three months (3).
Habitat
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Inhabits tropical wet evergreen, semi-evergreen and riparian forests as well as teak plantations, at altitudes of between 300 – 2,000 m above sea level (1).
Range
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Found in the Western Ghats of India (3).
Status
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The Nilgiri langur is classified as Vulnerable (VU C2a(i)) on the IUCN Red List 2004 (1) and is listed on Appendix II of CITES (4). It is also listed under schedule I, part I of the Indian Wildlife Protection Act 1972 (1).
Threats
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In the past, the Nilgiri langur has suffered from habitat loss and degradation as a result of agricultural expansion, mining operations, and dam construction. Currently, habitat loss due to increasing human settlements and deliberate fires, as well as hunting, road kills, and local trade for food, pets and traditional medicine, are the major threats (1). Locally it is believed that certain parts of the Nilgiri langur's body have medicinal value. The flesh and glands are used to treat asthma and the blood is drunk fresh as a rejuvenator. The replacement of native tree species with introduced, fast-growing fuel wood is also detrimental to the species (3).
Nilgiri langur
provided by wikipedia EN
The Nilgiri langur (Semnopithecus johnii)[3] is a langur (a type of Old World monkey) . This primate has glossy black fur on its body and golden brown fur on its head. It is similar in size and long-tailed like the gray langurs. Females have a white patch of fur on the inner thigh. It typically lives in troops of nine to ten monkeys.[1] Its diet consists of fruits, shoots and leaves. The species is classified as vulnerable due to habitat destruction and poaching for its fur and flesh, the latter believed to have aphrodisiac properties.[4]
Taxonomy and Classification
The classification of the Nilgiri langur has been disputed. Traditionally it has been placed within the genus Trachypithecus based on morphological similarities such as cranial morphology and neonatal pelage color, and within the Trachypithecus vetulus group within Trachypithecus based on a presumed close relationship with the purple-faced langur, which had been classified as Trachypithecus vetulus. DNA and other evidence suggests that the Nilgiri langur and purple-faced langur are more closely related to the gray langurs and have thus been reclassified within the genus Semnopithecus.[5][6][7][8][3][9]
Distribution
Found in the Nilgiri Hills of the Western Ghats in South India. Its range also includes Kodagu in Karnataka, Kodayar Hills in Tamil Nadu, and many other hilly areas in Kerala and Tamil Nadu. It is also found in Silent Valley National Park of Kerala.[10]
Description
The head-plus-body length is 78–80 cm in adult males and 58–60 cm in adult females, with the tail adding between 68.5 and 96.5 cm. The males weigh 9.1-14.8 kg, the females 10.9–12 kg.[4] The gestation period is not precisely known but assumed to be similar to the closely related Hanuman Langur, i.e. 200 days.[4]
References
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^ a b Singh, M.; Kumara, H.N.; Kumar, A. (2020). "Semnopithecus johnii". IUCN Red List of Threatened Species. 2020: e.T44694A17958623. doi:10.2305/IUCN.UK.2020-2.RLTS.T44694A17958623.en. Retrieved 19 November 2021.
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^ Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 178. ISBN 0-801-88221-4. OCLC 62265494.
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^ a b "Semnopithecus johnii". ITIS Report. ITIS. Retrieved 18 January 2020.
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^ a b c Malviya, M.; Srivastav, A.; Nigam, P.; Tyagi, P. C. (2011). "Indian National Studbook of Nilgiri Langur (Trachypithecus johnii)" (PDF). Wildlife Institute of India, Dehradun and Central Zoo Authority, New Delhi.
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^ Wilson, Don E.; Mittermeier, Russell A.; Rylands, Anthony B. (2012). "Introduction". Handbook of the Mammals of the World, Volume 3: Primates (1st ed.). Lynx Edicions. ISBN 978-8496553897. Retrieved 30 August 2018.
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^ Osterholz, Martin; Walter, Lutz; Roos, Christian (2008). "Phylogenetic position of the langur genera Semnopithecus and Trachypithecus among Asian colobines, and genus affiliations of their species groups". BMC Evolutionary Biology. 8 (58): 58. doi:10.1186/1471-2148-8-58. PMC 2268674. PMID 18298809.
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^ Brandon–Jones, D.; et al. (2004). "Asian Primate Classification". International Journal of Primatology. 25 (1): 97–164. CiteSeerX 10.1.1.694.7983. doi:10.1023/B:IJOP.0000014647.18720.32. S2CID 29045930.
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^ Xiao Ping Wang; et al. (27 April 2012). "Phylogenetic Relationships among the Colobine Monkeys Revisited: New Insights from Analyses of Complete mt Genomes and 44 Nuclear Non-Coding Markers". PLOS ONE. 7 (4): e36274. Bibcode:2012PLoSO...736274W. doi:10.1371/journal.pone.0036274. PMC 3338693. PMID 22558416.
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^ Karanth, K. Praveen; et al. (2008). "Molecular phylogeny and biogeography of langurs and leaf monkeys of South Asia (Primates: Colobinae)" (PDF). Molecular Phylogenetics and Evolution. 46 (2): 683–694. doi:10.1016/j.ympev.2007.11.026. PMID 18191589. Retrieved 30 August 2018.
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^ Govt of India (27 October 2020). The Gazette of India (PDF). Govt. of India. p. 20. Retrieved 14 April 2022.
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Nilgiri langur: Brief Summary
provided by wikipedia EN
The Nilgiri langur (Semnopithecus johnii) is a langur (a type of Old World monkey) . This primate has glossy black fur on its body and golden brown fur on its head. It is similar in size and long-tailed like the gray langurs. Females have a white patch of fur on the inner thigh. It typically lives in troops of nine to ten monkeys. Its diet consists of fruits, shoots and leaves. The species is classified as vulnerable due to habitat destruction and poaching for its fur and flesh, the latter believed to have aphrodisiac properties.
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