|Scientific Name:||Crocodylus palustris|
|Species Authority:||Lesson, 1831|
|Red List Category & Criteria:||Vulnerable A2cd ver 3.1|
|Assessor/s:||Choudhury, B.C. & de Silva, A.|
|Reviewer/s:||Bohm, M., Collen, B., Ram, M., Ross, J.P., Dacey, T. & Webb, G.J.W.|
|Contributor/s:||De Silva, R., Milligan, HT, Wearn, O.R., Wren, S., Zamin, T., Sears, J., Wilson, P., Lewis, S., Lintott, P. & Powney, G.|
A past population decline of 30% over three generations (75 years) has been inferred due to direct observations of declines in abundance, reductions in range and habitat quality and extirpation from part of the range. These declines, due to threats such as habitat destruction and illegal poaching, are now thought to have stopped with populations generally stable or recovering. Total global population estimated at less than 8,700 non-hatchlings and overall stable and increasing although continuing decline is reported in some areas, populations are restricted between drainages, regions and countries and not in contact- therefore fragmented and no single population estimated to be more than 1,000 mature individuals. An assessment of Vulnerable under criterion A2cd has therefore been made for Crocodylus palustris.
|Range Description:||This species is found in India, Sri Lanka, Pakistan, Nepal and possibly from Bangladesh, its range extends westwards into eastern Iran. The species has become locally extinct over large parts of its range, and viable populations only occur in protected areas (Santiapillai and Silva 2001). This has led to severe fragmentation of the population across its range. India and Sri Lanka retain the major populations. In India it is reported present in 15 of India's 28 states from Kerala and Tamil Nadu in the south, in the lowlands of east and west sides of the peninsula in Karnataka, Goa, and Orissa and through much of the Ganges drainage. Significant populations occur in the middle Ganges (Bihar and Jharkand), Chambal river (Rajastan and Madhya Pradesh) and in Gudgerat. In Sri Lanka approximately half the known population occurs within protected areas including Wilpatu and Yala National parks and the Jaffna peninsula.
The last recorded sighting of this species is Myanmar occurred in 1867-68 suggesting that this species is probably extinct there (Van Dink 1993 in Ross 1998). The species is extinct in the wild in Bangladesh (Cox and Rahman 1994) and represented only in very small captive populations. The species was last seen in Bhutan in the 1960s (Whitaker and Andrews 2003).
This species is known to occur up to 420 m above sea level.
Native:India; Iran, Islamic Republic of; Nepal; Pakistan; Sri Lanka
Regionally extinct:Bhutan; Myanmar
|Range Map:||Click here to open the map viewer and explore range.|
The species status was evaluated during an international workshop in Colombo, Sri Lanka in May 2013 at which over 40 regional experts and field researchers contributed current data and observations.
In 1989, the overall population size was estimated to be between 2,000-3,000 individuals (Whitaker and Whitaker 1989). Populations declined in the past, but in the current three generation period (approximately 1938 to present) populations in India and Sri Lanka were generally stable or recovering but decline continues in Pakistan, Iran, Nepal and the species is extirpated from Bangladesh and Myanmar. Although adequate survey data are lacking, existing records indicate that populations, while generally small and isolated, are widespread. The current global wild population is estimated at 5,700 to 8,700 non-hatchlings (data collected at the Colombo workshop 2013; see Table 1 in attached PDF). Field researchers and knowledgeable local experts consider numbers to be generally stable or increasing in the major remaining range in India and Sri Lanka
Bangladesh: Cox and Rahman (1994) reported C. palustris to be extinct in the wild, and only two wild Muggers were known to live in community ponds. However, S.M.A. Rashid (pers. comm.) reported 40 adult and 28 hatchling Muggers in captivity in seven zoos in 2009. Forty captive adult C. palustris (8 males:32 females) were obtained from the Madras Crocodile Bank Trust (India) in June 2005 (Andrews 2005).
Bhutan: Muggers are considered to have become extinct in Bhutan in the 1960s. A captive breeding programme was initiated at Phuentsholing and some individuals were reportedly released in the Manas River, but no detailed information is available. The released crocodiles were not monitored, and so their fate is unknown. In the past there have been sporadic sightings of C. palustris in the Bado, Manas, Sunkosh Torsa,Raidak and the Puna Tsongchu River, but there have been no recent records (Whitaker and Andrews 2003).
India: Muggers are reported from 15 States and the wild population is tentatively estimated as 3,021 to 4,287 non-hatchlings (Whitaker and Andrews 2003; R.Whitaker pers.comm. Colombo workshop 2013; see Table 1 in attached PDF). Numbers of non-hatchling Mugger in National Chambal Sanctuary (India) have apparently increased from 105 to 226 in 16 years (R.K.Sharma, data collected for the Madhya Pradesh Forest Department; Sharma et al. 1995). Human-Mugger conﬂict has been reported from different parts of the country (Whitaker 2007, 2008), indicating possible increases in population and/or Mugger reaching larger sizes.
Iran: Muggers are known from the drainages, small dams,artiﬁcial ponds and the natural ponds along the Sarbaz and Kajou Rivers, which join together to form the Bahokalat River in Sistan and Balochistan Provinces close to the Pakistan border. Recent surveys in the Nahang River area along the Pakistan border suggest that C. palustris is more widely distributed than previously considered. Mobaraki (unpublished data) estimated 200-300 C. palustris following a survey undertaken in 2007.
Pakistan: About 600 C. palustris are estimated to exist in four major wetland systems of Sindh, including a man-made lake (Javed and Rehman 2004, WWF unpublished 2007-2009 reports). Small populations are sparsely spread in Balochistan rivers, mainly near estuaries (Javed and Rehman 2004, Rehman 2007). These populations are considered to be vulnerable and diminishing, mainly due to drought and alteration of habitat (e.g. construction of dams). The species is reported to be extinct in the Punjab Province (Chaudhry 1993). Recent surveys undertaken in Sindh in 2006-09 (Masroor unpublished data) and 2008-09 (Chang unpublished data) may shed more light on status once they are available. More than 150 individuals are held in captivity in ﬁve facilities (four in Sindh and one in Punjab).
Nepal: The results of a 1993 survey indicated that the Muggers were restricted to isolated populations, primarily in protected habitats. Small numbers of individuals were known or suspected from the Mahakali, Nala, Karnali, Babai, Rapti,Narayani and Koshi River systems. Modiﬁcation of habitat by river disruption and damming, and mortality in ﬁsheries operations were major problems (McEachern 1994). Andrews and McEachern (1994) estimated 200 wild C. palustris in Nepal in 1993.
Myanmar: Van Dink (1993) reported that the last record of C. palustris in Myanmar was in 1867-68 and that the species was probably extinct there.
Sri Lanka: Approximately 2,400 to 3,500 individuals are estimated to exist in the wild, of which more than half are concentrated in several National Parks (e.g. Wilpattu, Yala, Bundala). Muggers are also found in many ‘tanks' or man-made reservoirs in the dry plains of the island. Overall, numbers are thought to be increasing and human-crocodile conflicts are widely reported. In other areas, C. palustris is threatened by rapid agricultural and industrial developments (Whitaker and Whitaker 1989).
|Habitat and Ecology:||
This species is found in freshwater habitats including, rivers, lakes, reservoirs, hill streams, village ponds and man made tanks. It may also be found in coastal saltwater lagoons. This species is a hole-nesting species.
The Mugger is a hole-nesting species, with egg-laying taking place during the annual dry season. Females become sexually mature at approximately 1.8-2 m, and lay 25-30 eggs (Whitaker and Whitaker 1989). Nests are located in a wide variety of habitats, and females have even been known to nest at the opening of, or inside, their burrow (B.C. Choudhury pers. comm.). In captivity, some Muggers are known to lay two clutches in a single year (Whitaker and Whitaker 1984), but this has not been observed in the wild. Incubation is relatively short, typically lasting 55-75 days (Whitaker 1987). Whitaker and Whitaker (1989) provide a good review of the behaviour and ecology of this species.
Like a number of other crocodilians, C. palustris is known to dig burrows. Whitaker and Whitaker (1984) referred to Mugger burrows in Sri Lanka and India (Gujarat and South India) and noted that yearling, sub-adult and adult Mugger all dig burrows. In Iran they are sometimes known to dig two burrows close to each other, which may be used by one or more crocodiles (Mobaraki 2002). These burrows are presumably utilized as an effective refuge from hot daytime ambient temperatures. These burrows play a critical role in the survival of crocodiles living in harsh environments (Whitaker et al. 2007), allowing them to avoid exposure to excessively low and high temperatures (<5ºC and >38ºC respectively) for long periods of time, which may be lethal (Lang 1987). Mugger are known to undertake long-distance overland treks in Gir (India) (Whitaker 1977), Sri Lanka (Whitaker and Whitaker 1979) and Iran (Mobaraki and Abtin 2007). Some Muggers are killed while crossing roads in Iran (Mobaraki and Abtin 2007).
|Major Threat(s):||This species was threatened by habitat destruction due to agricultural and industrial expansion, entanglement and drowning in fishing equipment, egg predation by humans, illegal poaching for skin and meat and the use of body parts in medicine. Crocodiles were often treated as pests to inland fisheries and killed whenever possible (Santiapillai and Silva 2001). There are increasing incidents of human conflict with this species and this is due to encroachment by humans into the species' natural habitats (B.C. Choudhury pers. comm.).|
This species is listed under CITES Appendix I. Management of the species is largely based on the legal protection of wild populations and captive breeding for restocking natural populations. Between 1978-1992 in India, a total of 1,193 captive bred individuals have been used to restock populations in 28 protected areas (Ross 1998). However, in 1994 due to overcrowding in captive centres, the production of new offspring was ceased by the Indian Government. Protection is moderately effective in protected areas in India, Sri Lanka, and Iran.
Education and public awareness into the importance of crocodiles to their habitats is needed (Santiapillai and Silva 2001), and continued monitoring of the populations is required.
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Chaudhry, A.A. 1993. Status of crocodiles in Pakistan. Crocodile Specialist Group Newsletter 12(1): 19-20.
Cox, J. and Rahman, M. 1994. An Assessment of Crocodile Resource Potential in Bangladesh. 12th Working Meeting of the Crocodiles Specalist Group, IUCN. Gland, Switzerland.
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McEachern, P. 1994. Interim results of the IUCN Nepal Crocodile Survey. The 16th Working Meeting of the IUCNSSC Crocodile Specialist Group: Pp. 199-217 in Crocodiles.
Mobaraki, A. 1998. Mugger studies continue. Crocodile Specialist Group Newsletter 17(3): 6.
Mobaraki, A. 2002. Snub-nosed crocodile (Crocodylus palustris) study in Iran. In: Crocodiles. The 16th Working Meeting of the IUCN SSC Crocodile Specialist Group: 253-256. IUCN, Gland, Switzerland.
Mobaraki, A. and Abtin, E. 2007. Movement behavior of Muggers, a potential threat. Crocodile Specialist Group Newsletter 26(1): 4.
Rahman, M.M. 1990. Status of crocodiles in Bangladesh. Crocodile Specialist Group Newsletter 9(3): 9-11.
Rehman, H. 2007. Baseline surveys of Reptilian Fauna of Hingol National Park, Balochistan. Forest & Wildlife Department, Balochistan, Quetta.
Ross, J.P. (ed.). 1998. Status Survey and Conservation Action Plan: Crocodiles. 2nd Edition. IUCN/SSC Crocodile Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK.
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Whitaker, R., Barr, B., de Silva, A. and Ratnasiri, P. 2007. Observations on burrows dug by mugger crocodiles (Crocodylus palustris) in Bundala National Park, Sri Lanka. Journal of the Bombay Natural History Society 104(2): 19-24.
|Citation:||Choudhury, B.C. & de Silva, A. 2013. Crocodylus palustris. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 17 April 2014.|
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