Wild water buffalo

Wild water buffalo
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Mammalia
Order:Artiodactyla
Family:Bovidae
Subfamily:Bovinae
Genus:Bubalus
Species: B. arnee
Binomial name
Bubalus arnee
(Kerr, 1792)
Subspecies
  • B. a. arnee (much of India and Nepal)
  • B. a. fulvus (Assam and neighbouring areas)
  • B. a. theerapati (Southeast Asia)
  • B. a. migona (Sri Lanka)[2]
Asiatic water buffalo range

The wild water buffalo (Bubalus arnee), also called Asian buffalo, Asiatic buffalo and wild Asian buffalo, is a large bovine native to the Indian Subcontinent and Southeast Asia. It has been listed as Endangered in the IUCN Red List since 1986, as the remaining population totals less than 4,000. A population decline of at least 50% over the last three generations (24–30 years) is projected to continue.[1] The global population has been estimated at 3,400 individuals, of which 3,100 (91%) live in India, mostly in Assam.[3] The wild water buffalo is the probable ancestor of the domestic water buffalo.[4]

Characteristics

Skull of a wild water buffalo in the Bavarian State Collection of Zoology

Wild water buffalo are larger and heavier than domestic buffalo, and weigh from 600 to 1,200 kg (1,300 to 2,600 lb).[5][6] The average weight of three captive wild water buffalo was 900 kg (2,000 lb).[7] Their head-to-body-length is 240 to 300 cm (94 to 118 in) with a tail 60 to 100 cm (24 to 39 in) long, and a shoulder height of 150 to 190 cm (59 to 75 in). Both sexes carry horns that are heavy at the base and widely spreading up to 2 m (79 in) along the outer edges, exceeding in size the horns of any other living bovid. Their skin color is ash gray to black. The moderately long, coarse and sparse hair is directed forward from the haunches to the long and narrow head. There is a tuft on the forehead, and the ears are comparatively small. The tip of the tail is bushy; the hooves are large and splayed.[8] They rank alongside the gaur as the heaviest living wild bovid species, as both attain similar average if not maximum weights, although, with their stockier, shorter-legged frame, wild water buffalo are somewhat less in length and height than the gaur.[9]

Distribution and habitat

A herd of wild water buffalo in Kaziranga National Park, Assam.

The wild water buffalo occurs in India, Nepal, Bhutan, Thailand, and Cambodia, with an unconfirmed population in Myanmar. It has been extirpated in Bangladesh, Laos, Vietnam, and Sri Lanka.[1][3] It is associated with wet grasslands, swamps and densely vegetated river valleys.[1]

In India, the species is largely restricted to in and around Kaziranga, Manas and Dibru-Saikhowa National Parks, Laokhowa Wildlife Sanctuary and Bura Chapori Wildlife Sanctuary and in a few scattered pockets in Assam; and in and around D'Ering Memorial Wildlife Sanctuary in Arunachal Pradesh. A small population survives in Balpakram National Park in Meghalaya, and in Chhattisgarh in the Indravati National Park and the Udanti Wildlife Sanctuary.[3] This population might extend into adjacent parts of Orissa. In the early 1990s, there may still have been about 3,300–3,500 wild water buffalo in Assam and the adjacent states of northeast India.[10] In 1997, the number was assessed at less than 1,500 mature individuals.[1]

Many surviving populations are thought to have interbred with feral or domestic water buffalo. In the late 1980s, fewer than 100 wild water buffalo were left in Madhya Pradesh.[11] By 1992, only 50 animals were estimated to have survived there.[10]

Nepal's only population lives in the Koshi Tappu Wildlife Reserve, and has grown from 63 individuals in 1976 to 219 individuals in 2009.[12] Latest census was carried out in 2016 which revealed this population has now grown significantly and has reached a total of 432 individuals with 120 males, 182 females and 130 calves. Further more, since there are no leopard, tiger, or dhole in the reserve, the annual growth rate of wild water buffalo is estimated at more than 7%.[13] Since the population increased, the responsible authorities considering a possible transfer of some individuals to the floodplains of Chitwan National Park in 2016.[14]

In and around Bhutan's Royal Manas National Park, a small number of wild water buffalo occur. This is part of the sub-population that occurs in India's Manas National Park.[3] In Myanmar, a few animals living independent of human husbandry live in the Hukaung Valley Tiger Reserve.[1]

In Thailand, wild water buffalo have been reported to occur in small herds of less than 40 individuals. A population of 25–60 individuals inhabited lowland areas of the Huai Kha Khaeng Wildlife Sanctuary between December 1999 and April 2001. This population has not grown significantly in 15 years, and may be interbreeding with domestic water buffalo.[15]

The population in Cambodia is confined to a small area of easternmost Mondulkiri and possibly Ratanakiri Provinces. Only a few dozen individuals remain.[16]

The wild water buffaloes in Sri Lanka are placed under subspecies migona, but they are believed to be descendants of the introduced domestic stock. It is unlikely that any true wild water buffaloes remain there today.[1]

Wild-living populations found elsewhere in Asia, Australia, Argentina and Bolivia are feral domestic water buffalo.[8]

Ecology and behavior

Wild water buffalo are both diurnal and nocturnal. Adult females and their young form stable clans of as many as 30 individuals which have home ranges of 170 to 1,000 ha (0.66 to 3.86 sq mi), including areas for resting, grazing, wallowing and drinking. Clans are led by old cows, even when bulls accompany the group. Several clans form a herd of 30 to 500 animals that gather at resting areas. Adult males form bachelor groups of up to 10 individuals, with older males often being solitary, and spend the dry season apart from the female clans. They are seasonal breeders in most of their range, typically in October and November. However, some populations breed year round. Dominant males mate with the females of a clan who subsequently drive them off. Their gestation period is 10 to 11 months, with an inter-birth interval of one year. They typically give birth to a single offspring, although twins are possible. Age at sexual maturity is 18 months for males, and three years for females. The maximum known lifespan is 25 years in the wild.[8] In the wild in Assam, the herd size varies from three to 30 individuals.[3]

They are probably grazers by preference, feeding mainly on graminoids when available, such as Bermuda grass, and Cyperus sedges, but they also eat other herbs, fruits, and bark, as well as browsing on trees and shrubs.[17] They also feed on crops, including rice, sugarcane, and jute, sometimes causing considerable damage.[18]

Tigers and crocodiles prey on adult wild water buffalo, and Asian black bears have also been known to kill them.[19]

Threats

A population reduction by at least 50% over the last three generations seems likely given the severity of the threats, especially hybridization; this population trend is projected to continue into the future. The most important threats are:[1]

Conservation

Bubalus arnee is included in CITES Appendix III, and is legally protected in Bhutan, India, Nepal, and Thailand.[1]

Taxonomic history

Water buffalo sculpture, Lopburi, Thailand, 2300 BCE

Carl Linnaeus applied the binomial Bos bubalis to the domestic water buffalo in his first description of 1758. In 1792, Robert Kerr applied the binomial Bos arnee to the wild species occurring in India north from Bengal. Later authors subordinated the wild water buffalo under either Bos, Bubalus or Buffelus.[20]

In 2003, the International Commission on Zoological Nomenclature placed Bubalus arnee on the Official List of Specific Names in Zoology, recognizing the validity of this name for a wild species.[21] Most authors have adopted the binomen Bubalus arnee for the wild water buffalo as valid for the taxon.[22]

Only a few DNA sequences are available from wild water buffalo populations.[23] Wild populations are considered to be the progenitor of modern domesticated water buffalo, but the genetic variation within B. arnee is unclear, and also how they are related to the domesticated river and swamp forms.[24]

References

  1. 1 2 3 4 5 6 7 8 9 Hedges, S.; Baral, H. S.; Timmins, R. J.; Duckworth, J. W. (2008). "Bubalus arnee". The IUCN Red List of Threatened Species. IUCN. 2008: e.T3129A9615891. doi:10.2305/IUCN.UK.2008.RLTS.T3129A9615891.en. Retrieved 15 January 2018.
  2. ↑ Castelló, José R. (2016). Bovids of the World. Princeton: Princeton University Press. p. 597. ISBN 9780691167176.
  3. 1 2 3 4 5 Choudhury, A. (2010). The vanishing herds: the wild water buffalo. Gibbon Books, Rhino Foundation, CEPF & COA, Taiwan, Guwahati, India.
  4. ↑ Lau, C. H., Drinkwater, R. D., Yusoff, K., Tan, S. G., Hetzel, D. J. S. and Barker, J. S. F. (1998). Genetic diversity of Asian water buffalo (Bubalus bubalis): mitochondrial DNA D-loop and cytochrome b sequence variation. Animal Genetics 29(4):253–264.
  5. ↑ Aryal, A., Shrestha, T. K., Ram, A., Frey, W., Groves, C., Hemmer, H., Wolfgang; Groves, C.; Hemmer, H., Dhakal, M., Koirala, R.J., Heinen, J. & Raubenheimer, D. (2011). CALL TO CONSERVE THE WILD WATER BUFFALO (BUBALUS ARNEE) IN NEPAL. International Journal of Conservation Science, 2(4).
  6. ↑ Ahrestani, F. S., Heitkönig, I. M., Matsubayashi, H., & Prins, H. H. (2016). Grazing and Browsing by Large Herbivores in South and Southeast Asia. In The Ecology of Large Herbivores in South and Southeast Asia (pp. 99-120). Springer Netherlands.
  7. ↑ Class, M., Lechner-Doll, M., & Streich, W. J. (2004). Differences in the range of faecal dry matter content between feeding types of captive wild ruminants. Acta theriologica, 49(2), 259-267.
  8. 1 2 3 Nowak, R. M. (1999). Walker's Mammals of the World. Volume 1. The Johns Hopkins University Press, Baltimore, USA and London, UK
  9. ↑ Smith, A. T., Xie, Y. (eds.) (2008). A Guide to the Mammals of China. Princeton University Press, Princeton Oxforshire.
  10. 1 2 Choudhury, A. (1994). "The decline of the wild water buffalo in northeast India". Oryx. 28 (1): 70–73.
  11. ↑ Divekar, H. K., Bhusan, B. (1988). Status of wild Asiatic buffalo (Bubalus bubalis) in the Raipur and Bastar Districts of Madhya Pradesh. Technical Report of the Bombay Natural History Society of the Salim Ali Nature Conservation Fund, SANCF Report No. 3/1988.
  12. ↑ Heinen, J. T. (1993). Population viability and management recommendations for wild water buffalo (Bubalus bubalis) in Kosi Tappu Wildlife Reserve, Nepal. Biological Conservation 65:29–34.
  13. ↑ "Arna population up in Koshi Tappu Reserve". kathmandupost.ekantipur.com. Retrieved 2016-05-04.
  14. ↑ "KTWR to shift 30 'Arnas' to Chitwan". kathmandupost.ekantipur.com. Retrieved 2016-05-04.
  15. ↑ Chaiyarat, R., Lauhachinda, V., Kutintara, U., Bhumpakphan, N., Prayurasiddhi, T. (2004). Population of Wild Water Buffalo (Bubalus Bubalis) in Huai Kha Khaeng Wildlife Sanctuary, Thailand. Natural History Bulletin Siam Society 52(2):151–162.
  16. ↑ Tordoff, A. W., Timmins, R. J., Maxwell, A., Huy Keavuth, Lic Vuthy and Khou Eang Hourt (eds). (2005). Biological assessment of the Lower Mekong Dry Forests Ecoregion. WWF Greater Mekong Programme. Phnom Penh, Cambodia
  17. ↑ Daniel, J. C., Grubh, B. R. (1966). The Indian wild buffalo Bubalus bubalis (Linn), in peninsular India: a preliminary survey. Journal of the Bombay Natural History Society 63: 32–53.
  18. ↑ Lēkhakun, B., Mcneely, J. A. (1988). Mammals of Thailand. 2nd edition. Saha Karn Bhaet, Bangkok, Thailand
  19. ↑ Humphrey, S. R., Bain, J. R. (1990). Endangered animals of Thailand. Issue 6 of Flora & Fauna handbook. Sandhill Crane Press. ISBN 1-877743-05-4
  20. ↑ Ellerman, J. R., Morrison-Scott, T. C. S. (1966). Checklist of Palaearctic and Indian mammals 1758 to 1946. Second edition. London: British Museum of Natural History. Pp 383–384.
  21. ↑ International Commission on Zoological Nomenclature (2003). Opinion 2027 (Case 3010). Usage of 17 specific names based on wild species which are pre-dated by or contemporary with those based on domestic animals (Lepidoptera, Osteichthyes, Mammalia). The Bulletin of Zoological Nomenclature 60(1): 81–84.
  22. ↑ Gentry, A. Clutton-Brock, J., Groves, C. P. (2004). The naming of wild animal species and their domestic derivatives. Journal of Archaeological Science 31:645–651.
  23. ↑ Flamand, J. R. B., Vankan, D., Gairhe, K. P., Duong, H., Barker, J. S. F. (2003). Genetic identification of wild Asian water buffalo in Nepal Archived June 2, 2013, at the Wayback Machine.. Animal Conservation 6(3):265–270.
  24. ↑ Yang, D. Y., Li Liu, Chen, X., Speller, C. F. (2008). Wild or domesticated: DNA analysis of ancient water buffalo remains from north China. Journal of Archaeological Science 35(2008):2778–2785.
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