Manipur bush rat
|Manipur bush rat|
Range and habitat
The species is endemic to northeast India, and has been recorded from several localities. These are: Angarakhata in Kamrup district (Assam), Bishnupur, Imphal, Senapati and Karong (specimen FMNH 76562) in Manipur.
Originally thought to occur in Yunnan in China also, the Chinese animals have been reclassified as Hadromys yunnanensis Yang & Wang 1987. The fossil record shows that populations of the Manipur Bush Rat existed all over Thailand right down to the Thai-Malay border during the Pleistocene. During that time, the Indo-Malayan region may have had a cooler and drier climate with savanna-like regions. A related species is known from the Siwalik fossils from northern Pakistan. These findings indicate that Hadromys humei is probably a "relict" species.
The Manipur bush rat occurs at medium altitudes from 900 to 1,300 metres (3,000 to 4,300 ft) above sea level. It inhabits tropical evergreen, moist deciduous and evergreen forests and also found in secondary forests in northeastern India.
The murid was described by Oldfield Thomas in 1886 from specimens in the Manipur collection of Allan Octavian Hume, which was donated to the British Museum (Natural History) after Hume's life's work in ornithological notes were sold by a servant as waste paper. The Manipur Bush Rat was named in his honour. The collection has two male and two female specimens, recorded to be collected on 23 March 1881 from "Moirang" (in Manipur), the type locality for this species.
The specimen has been described by Thomas (1886) as:
The head and body length of the largest specimen, a female, was 125 millimetres (4.9 in) long while the tail is 106 millimetres (4.2 in) long. Elsewhere, the head and body length has been given as head and body length as 95 to 140 millimetres (3.7 to 5.5 in), the tail length as 195 to 40 millimetres (7.7 to 1.6 in). The weight has been recorded as ranging from 41 to 77 grams (1.4 to 2.7 oz).
- Limited area of occurrence (less than 500 square kilometres (190 sq mi)).
- Limited geographical extent of range (less than 5,000 kilometres (3,100 mi)).
- Less than five areas from which it is reported.
- Continuing decline in extent and degradation of habitat.
The principal threats to this species are assessed to be loss of and degradation of habitat, fragmentation, and encroachment. Besides these, hunting and fire are also considered to be contributing causes.
- Molur, S. & Nameer, P.O. (2010). "Hadromys humei". IUCN Red List of Threatened Species. Version 3.1 (3.1). International Union for Conservation of Nature. Retrieved 22 May 2011.
- Musser, Guy G. (1987). "The occurrence of Hadromys (Rodentia, Muridae) in early Pleistocene Siwalik strata in northern Pakistan and its bearing on biogeographic affinities between Indian and northeastern African murine faunas". American Museum Novitates. 2883. hdl:2246/5216.
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- Yaowalak Chaimanee & Jean-Jacques Jaeger (2000). "Occurrence of Hadromys humei (Rodentia: Muridae) during the Pleistocene in Thailand". Journal of Mammalogy. 81 (3): 659–665. doi:10.1644/1545-1542(2000)081<0659:oohhrm>2.3.co;2.
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- Moulton, Edward (2003). "The Contributions of Allan O. Hume to the Scientific Advancement of Indian Ornithology". In Daniel, J. C.; Ugra, G. W. Petronia: Fifty Years of Post-Independence Ornithology in India. BNHS, Bombay & Oxford University Press, New Delhi. pp. 295–317.
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