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Asian small-clawed otter

November 26, 2023

The Asian small-clawed otter (Aonyx cinereus), also known as the oriental small-clawed otter and the small-clawed otter, is an otter species native to South and Southeast Asia. It has short claws that do not extend beyond the pads of its webbed digits. With a total body length of 730 to 960 mm (28.6 to 37.6 in), it is the smallest otter species in the world.

Asian small-clawed otter
CITES Appendix I (CITES)[1]
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Mustelidae
Subfamily: Lutrinae
Genus: Aonyx
Species:
A. cinereus
Binomial name
Aonyx cinereus
(Illiger, 1815)
Asian small-clawed otter native range (in green)
Synonyms

Amblonyx cinereus
Aonyx cinerea

The Asian small-clawed otter lives in riverine habitats, freshwater wetlands and mangrove swamps. It feeds on molluscs, crabs and other small aquatic animals. It lives in pairs, but was also observed in family groups with up to 12 individuals.

It is listed as Vulnerable on the IUCN Red List, and is threatened by habitat loss, pollution, and in some areas also by hunting.

Taxonomy edit

Lutra cinerea was the scientific name proposed by Johann Karl Wilhelm Illiger in 1815 for an otter collected in Batavia.[2] In the 19th and 20th centuries, several zoological specimens were described:

Phylogeny edit

Results of a mitochondrial cytochrome B analysis published in 1998 indicated that it should be subordinated to the genus Aonyx.[7] Results of a molecular study published in 2008 showed that the Asian small-clawed otter is a sister taxon of Lutrogale, lending support to retaining the genus Amblonyx or expanding Aonyx to make it monophyletic. They genetically diverged about 1.5 million years ago.[8]

The Asian small-clawed otter groups with the African clawless otter (Aonyx capensis) and the smooth-coated otter (Lutrogale perspicillata) into a sister clade with the genus Lutra. Hybridisation of Asian small-clawed otter females with smooth-coated otter males occurred in Singapore. The resulting offspring and their descendants bred back into the smooth-coated otter population, but maintained the genes of their small-clawed otter ancestors. Today, a population of at least 60 hybrid otters are present in Singapore.[9]

Characteristics edit

 
Closeup of a small-clawed otter's mouth

The Asian small-clawed otter has deep brown fur with some rufous tinge on the back, but paler below. Its underfur is lighter near the base. The sides of the neck and head are brown, but its cheeks, upperlip, chin, throat and sides of the neck are whitish.[10] Its skull is short, and the naked rhinarium rounded above. The muzzle has long coarse vibrissae on either side. Its eyes are located toward the front of the head. The small ears are oval-shaped with an inconspicuous tragus and antitragus. Its paws are narrow with short digits that are webbed to the last joint. There are short hairs on the lower sides of the interdigital webs. The four-lobed plantar pads are longer than wide. The claws are short, almost erect, and in some individuals even absent.[11] Females have four mammary glands.[12]

The Asian small-clawed otter is the smallest otter species in Asia. In head-to-body length, it ranges from 470 to 610 mm (18.4 to 24 in) with a 260 to 350 mm (10.2 to 13.6 in) long tail. The tapering tail is thick and muscular, especially at the base, and more than half the length of the body. Hind feet are 97 to 102 mm (3.8 to 4 in) long. Length of skull ranges from 3.3 to 3.7 in (84 to 94 mm). It does not have upper premolars and only four postcanine teeth above.[13] Adult captive otters range in weight from 2.7 to 3.5 kg (6.0 to 7.7 lb).[14]

Distribution and habitat edit

The Asian small-clawed otter's native range comprises parts of India to Southeast Asia including the islands of Sumatra, Java, Borneo and Palawan. It lives in freshwater wetlands such as swamps, meandering rivers, irrigated rice fields as well as estuaries, coastal lagoons and tidal pools. It occurs in West Bengal, Assam and Arunachal Pradesh, and in coastal regions of Odisha. In Karnataka, Nilgiri and Palni hills in Tamil Nadu, it lives in shallow mountain creeks up to an elevation of 2,000 m (6,600 ft).[1] In West Java, it inhabits areas along slow-flowing irrigation channels, pond areas and rice fields surrounded by vegetation that offers shelter. It also occurs in mangroves.[15]

In the 1980s, a few Asian small-clawed otters escaped from captivity in England and established a population in the wild.[16][17]

Behaviour and ecology edit

 
Family group of Asian small-clawed otters

The Asian small-clawed otter is mostly active after dark.[18][19] It lives in groups of up to 15 individuals.[19] In the Bangladesh Sundarbans, 53 individuals were recorded in 351 km (218 mi) of water courses in 13 locations between November 2014 and March 2015. Group size ranged from one to 12 individuals.[20] Group members communicate using 12 or more distinct calls, and utter a variety of yelps and whimpers.[12] When disturbed, they scream to rally the help of others.[21]

When swimming on the surface, otters row with the forelimbs and paddle with the hind limbs.[22] When diving under water, they undulate their bodies and tails. Captive otters swim at speeds of 0.7–1.2 m/s (2.3–3.9 ft/s).[14]

Observations of wild Asian small-clawed otters revealed that they smear their spraint at latrine sites, using their hind feet and tails. Large groups smeared more than groups of three or fewer animals. The frequency of latrines with smeared scats varied in different locations, indicating a preference for certain sites. Spraint smearing most likely facilitates social ties among group members and is associated with territorial marking displays. They use grassy or sandy banks for resting, sun bathing and grooming. In marshes, they use mostly islands.[19]

Diet edit

 
Asian small-clawed otters feeding in Edinburgh Zoo

The Asian small-clawed otter feeds mainly on crabs, mudskippers and Trichogaster fish. Its diet varies seasonally. When and where available, it also catches snakes, frogs, insects, rats and ricefield fish like catfish, Anabas testudineus and Channa striata.[19] The size of crabs found in spraints in Huai Kha Khaeng Wildlife Sanctuary ranged in carapace width from 10 to 44 cm (3.9 to 17.3 in).[23] Captive Asian small-clawed otters were observed to leave shellfish in the sun so the heat causes them to open, making it possible for them to eat them without having to crush the shells.[12]

Reproduction edit

Information about the Asian small-clawed otter's mating and breeding behaviour has been studied in captive environments. Captive pairs are monogamous. The estrous cycle of females lasts 28 to 30 days with estrus lasting between one and 13 days. Usually, mating takes place in the water.[24]Gestation lasts 62 to 86 days. Interval between births is at least eight months.[25] About two weeks before parturition, both female and male engage in building a nest. They collect grass, hay or straw and carry this material into the breeding chamber. Between one and seven pups are born in a litter. Pups are born with closed eyes, which open in the fifth week.[24] Newborn pups weigh between 45.6 and 62.5 g (1.61 and 2.20 oz) and reach a weight of 410–988 g (14.5–34.9 oz) after 60 days.[26] They start exploring the environs of the breeding den at the age of ten weeks. At about three months, they enter and paddle in shallow water under the guidance of the mother. They become independent at the age of four to five months.[24]

Threats edit

The Asian small-clawed otter is threatened by poaching for its fur, loss and destruction of habitats such as hill streams, peat swamp forests and mangroves for aquaculture projects. Threats in India include deforestation, conversion of natural habitat for tea and coffee plantations, overfishing of rivers and water pollution through pesticides.[1]

It is the most sought after otter species for the illegal pet trade in Asia. At least 711 Asian small-clawed otters were offered for sale through online websites by 280 traders in Indonesia, Thailand, Malaysia and Vietnam between 2016 and 2017.[27] Between December 2015 and October 2018, 49 Asian small-clawed otters were confiscated from wildlife traffickers in Thailand, Vietnam and Japan; 35 of them were bound for sale in Japan.[28]

Conservation edit

 
Asian small-clawed otter swimming with Indian rhinoceros at Zoo Basel

The Asian small-clawed otter was listed on CITES Appendix II and is protected in almost all range countries prohibiting its killing.[1] Since August 2019, it is included in CITES Appendix I, thus strengthening its protection in regards to international trade.[29]

In captivity edit

The Association of Zoos and Aquariums established a Species Survival Plan for the Asian small-clawed otter in 1983 to encourage research on captive breeding.[30][31]

In Europe, Zoo Basel keeps Asian small-clawed otters together with Indian rhinoceros.[32]

Asian small-clawed otters suffering from osteoporosis display resorption of hyperactive bone and cartilage by osteoclasts in many bone sites, which causes pockmarks on all the bones.[33]

References edit

  1. ^ a b c d e Wright, L.; de Silva, P.; Chan, B.; Reza Lubis, I. & Basak, S. (2021). "Aonyx cinereus". IUCN Red List of Threatened Species. 2021: e.T44166A164580923. doi:10.2305/IUCN.UK.2021-3.RLTS.T44166A164580923.en. Retrieved 10 December 2022.
  2. ^ Illiger, C. (1815). . Abhandlungen der Königlichen Preußischen Akademie der Wissenschaften zu Berlin. 1804−1811: 39−159. Archived from the original on 4 April 2019. Retrieved 12 June 2020.
  3. ^ Rafinesque, C. S. (1832). "Description of a New Otter, Lutra concolor, from Assam in India". Atlantic journal, and friend of knowledge in eight numbers : containing about 160 original articles and tracts on natural and historical sciences, the description of about 150 new plants, and 100 new animals or fossils ; many vocabularies of languages, historical and geological facts. Philadelphia. p. 62. ISBN 9780665414664.
  4. ^ Horsfield, T. (1824). "Lutra leptonyx". Zoological researches in Java, and the neighbouring islands. London: Kingsbury, Parbury & Allen. pp. 185–191.
  5. ^ Gray, J. E. (1843). "The Wargul. Aonyx leptonyx". List of the specimens of Mammalia in the collection of the British Museum. p. 71.
  6. ^ Pocock, R. I. (1940). "Notes on Some British Indian Otters, with Description of two new Subspecies". The Journal of the Bombay Natural History Society. 41 (3–4): 514–517.
  7. ^ Koepfli, K.-P. & Wayne, R. K. (1998). "Phylogenetic relationships of otters (Carnivora: Mustelidae) based on mitochondrial cytochrome B sequences". Journal of Zoology. 246 (4): 401–416. doi:10.1111/j.1469-7998.1998.tb00172.x.
  8. ^ Koepfli, K.P.; Kanchanasaka, B.; Sasaki, H.; Jacques, H.; Louie, K.D.Y.; Hoai, T.; Dang, N.X.; Geffen, E.; Gutleb, A.; Han, S.; Heggberget, T. M.; LaFontaine, L.; Lee, H.; Melisch, R.; Ruiz-Olmo, J.; Santos-Reis, M.; Sidorovich, V.E.; Stubbe, M. & Wayne, R.K. (2008). "Establishing the foundation for an applied molecular taxonomy of otters in Southeast Asia" (PDF). Conservation Genetics. 9 (6): 1589–1604. doi:10.1007/s10592-007-9498-5. S2CID 24619297.
  9. ^ Moretti, B.; Al-Sheikhly, O. F.; Guerrini, M.; Theng, M.; Gupta, B. K.; Haba, M. K.; Khan, W. A.; Khan, A. A. & Barbanera, F. (2017). "Phylogeography of the smooth-coated otter (Lutrogale perspicillata): distinct evolutionary lineages and hybridization with the Asian small-clawed otter (Aonyx cinereus)". Scientific Reports. 7: 41611. Bibcode:2017NatSR...741611M. doi:10.1038/srep41611. PMC 5269716. PMID 28128366.
  10. ^ Blanford, W. T. (1888). "Lutra leptonyx. The clawless Otter". The Fauna of British India, Including Ceylon and Burma. Vol. Mammalia. London: Taylor and Francis. pp. 187–188.
  11. ^ Pocock, R. I. (1921). "On the External Characters of some Species of Lutrinae (Otters)". Proceedings of the Zoological Society of London. 37 (3): 535–545. doi:10.1111/j.1096-3642.1921.tb03279.x.
  12. ^ a b c Timmins, W. H. (1971). "Observations on breeding the oriental short clawed otter Amblonyx cinerea at Chester Zoo". International Zoo Yearbook. 11: 109–111. doi:10.1111/j.1748-1090.1971.tb01868.x.
  13. ^ Pocock, R. I. (1941). "Genus Amblonyx, Rafinesque". The Fauna of British India including Ceylon and Burma. Vol. Mammalia II. London: Taylor and Francis. pp. 303–317.
  14. ^ a b Borgwardt, N. & Culik, B. M. (1999). "Asian small-clawed otters (Amblonyx cinerea): resting and swimming metabolic rates". Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology. 169 (2): 100–106. doi:10.1007/s003600050199. PMID 10227184. S2CID 22682528.
  15. ^ Melisch, R.; Kusumawardhani, L.; Asmoro, P. B. & Lubis, I. R. (1996). The otters of west Java – a survey of their distribution and habitat use and a strategy towards a species conservation programme. Bogor, Indonesia: Wetlands International – Indonesia Programme.
  16. ^ Jefferies, D. J. (1989). "The Asian short-clawed otter Amblonyx cinerea (Illiger) living wild in Britain". Otters (Earsham). 2 (3): 21–25.
  17. ^ Jefferies, D. J. (1991). "Another record of an Asian short-clawed otter living free in Oxford with notes on its implications". Journal of the Otter Trust. 2 (2): 9–12.
  18. ^ Hutton, A. F. (1949). "Notes on the Snakes and the Mammals of the High Wavy Mountains, Madura District, South India. Part II – Mammals". Journal of the Bombay Natural History Society. 48 (4): 681–694.
  19. ^ a b c d Foster-Turley, P. (1992). Conservation ecology of sympatric Asian otters Aonyx cinerea and Lutra perspicillata (PhD Dissertation). Gainesville, Florida: University of Florida.
  20. ^ Aziz, M.A. (2018). "Notes on population status and feeding behaviour of Asian Small-clawed otter (Aonyx cinereus) in the Sundarbans mangrove forest of Bangladesh". IUCN Otter Specialist Group Bulletin. 35 (1): 3–10.
  21. ^ Sivasothi, N. & Nor, B. H. M. (1994). "A review of otters (Carnivora: Mustelidae: Lutrinae) in Malaysia and Singapore". Hydrobiologia. 285 (1–3): 1–3. doi:10.1007/BF00005663. S2CID 44011643.
  22. ^ Fish, F. E. (1994). "Association of propulsive swimming mode with behaviour in the river otters (Lutra canadensis)". Journal of Mammalogy. 75 (4): 989–997. doi:10.2307/1382481. JSTOR 1382481.
  23. ^ Kruuk, H.; Kanchanasaka, B.; O'Sullivian, S. & Wanghongsa, S. (1994). "Niche separation in three sympatric otters Lutra perspicillata, Lutra lutra and Aonyx cinerea in Huai Kha Khaeng, Thailand". Biological Conservation. 69: 115–210. doi:10.1016/0006-3207(94)90334-4.
  24. ^ a b c Lancaster, W. E. (1975). "Exhibiting and breeding the Asian small-clawed otter at Adelaide Zoo". International Zoo Yearbook. 15: 63–65. doi:10.1111/j.1748-1090.1975.tb01355.x.
  25. ^ Sobel, G. (1996). Development and validation of noninvasive, fecal steroid monitoring procedures for the Asian small-clawed otter, Aonyx cinerea (Master of Science). Gainesville, Florida: University of Florida.
  26. ^ Maslanka, M. T. & Crissey, S. D. (1998). "Nutrition and diet". In Lombardi, D. & O’Connor, J. (eds.). Asian small-clawed otter (Aonyx cinerea) husbandary manual. Powell, Ohio: Columbus Zoological Gardens and AZA Asian Small-Clawed Otter SSP. pp. 1–18.
  27. ^ Gomez, L. & Bouhuys, J. (2018). Illegal Otter Trade in Southeast Asia (PDF). Kelana Jaya, Selangor, Malaysia: Traffic Southeast Asia Regional Office.
  28. ^ Gomez, L. & Shepherd, C. R. (2019). "Stronger International Regulations and Increased Enforcement Effort is needed to end the Illegal Trade in Otters in Asia" (PDF). IUCN Otter Specialist Group Bulletin. 36 (2): 71–76.
  29. ^ DTE Staff (2019). "CITES CoP 2019: Otters given highest protection from trade". DownToEarth.
  30. ^ Foster-Turley, P. & Engfar, S. (1988). "The Species Survival Plan for the Asian small-clawed otter Aonyx cinerea". International Zoo Yearbook. 27: 79–84. doi:10.1111/j.1748-1090.1988.tb03199.x.
  31. ^ Foster-Turley, P. (1986). "A progress report on the species survival plan for Asian small-clawed otters in United States zoos". Otter Specialist Group Bulletin. 1: 19–21.
  32. ^ "Zoo-Nachwuchs sorgt für Trubel". Zoo Basel (in German). 2012.
  33. ^ Kim, I.-S.; Sim, J.-H.; Cho, J.-W.; Kim, B.; Lee, Y.; Ahn, D. (2020). "Osteoporosis in an Asian small-clawed otter (Aonyx cinereus Illiger, 1815)". Journal of Veterinary Medical Science. 82 (3): 376–378. doi:10.1292/jvms.19-0546. PMC 7118488. PMID 32009030.

External links edit

 
Wikispecies has information related to Aonyx cinerea.
 
Wikimedia Commons has media related to Aonyx cinerea.
  • "Asian Small-clawed Otter". IUCN Otter Specialist Group.
  • "Aonyx cinerea, Oriental small-clawed otter". Animal Diversity Web.
  • "Asian small-clawed otter". Smithsonian’s National Zoo & Conservation Biology Institute. 25 April 2016.
  • "Ban on endangered otter trade to take effect amid pet boom in Japan". Kyodo News. 2019.

November 26, 2023
asian, small, clawed, otter, aonyx, cinereus, also, known, oriental, small, clawed, otter, small, clawed, otter, otter, species, native, south, southeast, asia, short, claws, that, extend, beyond, pads, webbed, digits, with, total, body, length, smallest, otte. The Asian small clawed otter Aonyx cinereus also known as the oriental small clawed otter and the small clawed otter is an otter species native to South and Southeast Asia It has short claws that do not extend beyond the pads of its webbed digits With a total body length of 730 to 960 mm 28 6 to 37 6 in it is the smallest otter species in the world Asian small clawed otterConservation statusVulnerable IUCN 3 1 1 CITES Appendix I CITES 1 Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClass MammaliaOrder CarnivoraFamily MustelidaeSubfamily LutrinaeGenus AonyxSpecies A cinereusBinomial nameAonyx cinereus Illiger 1815 Asian small clawed otter native range in green SynonymsAmblonyx cinereusAonyx cinereaThe Asian small clawed otter lives in riverine habitats freshwater wetlands and mangrove swamps It feeds on molluscs crabs and other small aquatic animals It lives in pairs but was also observed in family groups with up to 12 individuals It is listed as Vulnerable on the IUCN Red List and is threatened by habitat loss pollution and in some areas also by hunting Contents 1 Taxonomy 1 1 Phylogeny 2 Characteristics 3 Distribution and habitat 4 Behaviour and ecology 4 1 Diet 4 2 Reproduction 5 Threats 6 Conservation 6 1 In captivity 7 References 8 External linksTaxonomy editLutra cinerea was the scientific name proposed by Johann Karl Wilhelm Illiger in 1815 for an otter collected in Batavia 2 In the 19th and 20th centuries several zoological specimens were described Lutra concolor proposed by Constantine Samuel Rafinesque in 1832 was a uniform coloured otter from Assam Rafinesque also proposed Amblonyx as name for a subgenus for otters with short obtuse claws 3 Lutra leptonyx proposed by Thomas Horsfield in 1824 were two adult small clawed otters collected in Java 4 It was subordinated to the genus Aonyx by John Edward Gray in 1843 5 Amblonyx cinerea nirnai proposed by Reginald Innes Pocock in 1940 was a dark brown small clawed otter from Virajpet in South India 6 Phylogeny edit Results of a mitochondrial cytochrome B analysis published in 1998 indicated that it should be subordinated to the genus Aonyx 7 Results of a molecular study published in 2008 showed that the Asian small clawed otter is a sister taxon of Lutrogale lending support to retaining the genus Amblonyx or expanding Aonyx to make it monophyletic They genetically diverged about 1 5 million years ago 8 The Asian small clawed otter groups with the African clawless otter Aonyx capensis and the smooth coated otter Lutrogale perspicillata into a sister clade with the genus Lutra Hybridisation of Asian small clawed otter females with smooth coated otter males occurred in Singapore The resulting offspring and their descendants bred back into the smooth coated otter population but maintained the genes of their small clawed otter ancestors Today a population of at least 60 hybrid otters are present in Singapore 9 Characteristics edit nbsp Closeup of a small clawed otter s mouthThe Asian small clawed otter has deep brown fur with some rufous tinge on the back but paler below Its underfur is lighter near the base The sides of the neck and head are brown but its cheeks upperlip chin throat and sides of the neck are whitish 10 Its skull is short and the naked rhinarium rounded above The muzzle has long coarse vibrissae on either side Its eyes are located toward the front of the head The small ears are oval shaped with an inconspicuous tragus and antitragus Its paws are narrow with short digits that are webbed to the last joint There are short hairs on the lower sides of the interdigital webs The four lobed plantar pads are longer than wide The claws are short almost erect and in some individuals even absent 11 Females have four mammary glands 12 The Asian small clawed otter is the smallest otter species in Asia In head to body length it ranges from 470 to 610 mm 18 4 to 24 in with a 260 to 350 mm 10 2 to 13 6 in long tail The tapering tail is thick and muscular especially at the base and more than half the length of the body Hind feet are 97 to 102 mm 3 8 to 4 in long Length of skull ranges from 3 3 to 3 7 in 84 to 94 mm It does not have upper premolars and only four postcanine teeth above 13 Adult captive otters range in weight from 2 7 to 3 5 kg 6 0 to 7 7 lb 14 Distribution and habitat editThe Asian small clawed otter s native range comprises parts of India to Southeast Asia including the islands of Sumatra Java Borneo and Palawan It lives in freshwater wetlands such as swamps meandering rivers irrigated rice fields as well as estuaries coastal lagoons and tidal pools It occurs in West Bengal Assam and Arunachal Pradesh and in coastal regions of Odisha In Karnataka Nilgiri and Palni hills in Tamil Nadu it lives in shallow mountain creeks up to an elevation of 2 000 m 6 600 ft 1 In West Java it inhabits areas along slow flowing irrigation channels pond areas and rice fields surrounded by vegetation that offers shelter It also occurs in mangroves 15 In the 1980s a few Asian small clawed otters escaped from captivity in England and established a population in the wild 16 17 Behaviour and ecology edit nbsp Family group of Asian small clawed ottersThe Asian small clawed otter is mostly active after dark 18 19 It lives in groups of up to 15 individuals 19 In the Bangladesh Sundarbans 53 individuals were recorded in 351 km 218 mi of water courses in 13 locations between November 2014 and March 2015 Group size ranged from one to 12 individuals 20 Group members communicate using 12 or more distinct calls and utter a variety of yelps and whimpers 12 When disturbed they scream to rally the help of others 21 When swimming on the surface otters row with the forelimbs and paddle with the hind limbs 22 When diving under water they undulate their bodies and tails Captive otters swim at speeds of 0 7 1 2 m s 2 3 3 9 ft s 14 Observations of wild Asian small clawed otters revealed that they smear their spraint at latrine sites using their hind feet and tails Large groups smeared more than groups of three or fewer animals The frequency of latrines with smeared scats varied in different locations indicating a preference for certain sites Spraint smearing most likely facilitates social ties among group members and is associated with territorial marking displays They use grassy or sandy banks for resting sun bathing and grooming In marshes they use mostly islands 19 Diet edit nbsp Asian small clawed otters feeding in Edinburgh ZooThe Asian small clawed otter feeds mainly on crabs mudskippers and Trichogaster fish Its diet varies seasonally When and where available it also catches snakes frogs insects rats and ricefield fish like catfish Anabas testudineus and Channa striata 19 The size of crabs found in spraints in Huai Kha Khaeng Wildlife Sanctuary ranged in carapace width from 10 to 44 cm 3 9 to 17 3 in 23 Captive Asian small clawed otters were observed to leave shellfish in the sun so the heat causes them to open making it possible for them to eat them without having to crush the shells 12 Reproduction edit Information about the Asian small clawed otter s mating and breeding behaviour has been studied in captive environments Captive pairs are monogamous The estrous cycle of females lasts 28 to 30 days with estrus lasting between one and 13 days Usually mating takes place in the water 24 Gestation lasts 62 to 86 days Interval between births is at least eight months 25 About two weeks before parturition both female and male engage in building a nest They collect grass hay or straw and carry this material into the breeding chamber Between one and seven pups are born in a litter Pups are born with closed eyes which open in the fifth week 24 Newborn pups weigh between 45 6 and 62 5 g 1 61 and 2 20 oz and reach a weight of 410 988 g 14 5 34 9 oz after 60 days 26 They start exploring the environs of the breeding den at the age of ten weeks At about three months they enter and paddle in shallow water under the guidance of the mother They become independent at the age of four to five months 24 Threats editThe Asian small clawed otter is threatened by poaching for its fur loss and destruction of habitats such as hill streams peat swamp forests and mangroves for aquaculture projects Threats in India include deforestation conversion of natural habitat for tea and coffee plantations overfishing of rivers and water pollution through pesticides 1 It is the most sought after otter species for the illegal pet trade in Asia At least 711 Asian small clawed otters were offered for sale through online websites by 280 traders in Indonesia Thailand Malaysia and Vietnam between 2016 and 2017 27 Between December 2015 and October 2018 49 Asian small clawed otters were confiscated from wildlife traffickers in Thailand Vietnam and Japan 35 of them were bound for sale in Japan 28 Conservation edit nbsp Asian small clawed otter swimming with Indian rhinoceros at Zoo BaselThe Asian small clawed otter was listed on CITES Appendix II and is protected in almost all range countries prohibiting its killing 1 Since August 2019 it is included in CITES Appendix I thus strengthening its protection in regards to international trade 29 In captivity edit The Association of Zoos and Aquariums established a Species Survival Plan for the Asian small clawed otter in 1983 to encourage research on captive breeding 30 31 In Europe Zoo Basel keeps Asian small clawed otters together with Indian rhinoceros 32 Asian small clawed otters suffering from osteoporosis display resorption of hyperactive bone and cartilage by osteoclasts in many bone sites which causes pockmarks on all the bones 33 References edit a b c d e Wright L de Silva P Chan B Reza Lubis I amp Basak S 2021 Aonyx cinereus IUCN Red List of Threatened Species 2021 e T44166A164580923 doi 10 2305 IUCN UK 2021 3 RLTS T44166A164580923 en Retrieved 10 December 2022 Illiger C 1815 Uberblick der Saugethiere nach ihrer Verteilung uber die Welttheile Abhandlungen der Koniglichen Preussischen Akademie der Wissenschaften zu Berlin 1804 1811 39 159 Archived from the original on 4 April 2019 Retrieved 12 June 2020 Rafinesque C S 1832 Description of a New Otter Lutra concolor from Assam in India Atlantic journal and friend of knowledge in eight numbers containing about 160 original articles and tracts on natural and historical sciences the description of about 150 new plants and 100 new animals or fossils many vocabularies of languages historical and geological facts Philadelphia p 62 ISBN 9780665414664 Horsfield T 1824 Lutra leptonyx Zoological researches in Java and the neighbouring islands London Kingsbury Parbury amp Allen pp 185 191 Gray J E 1843 The Wargul Aonyx leptonyx List of the specimens of Mammalia in the collection of the British Museum p 71 Pocock R I 1940 Notes on Some British Indian Otters with Description of two new Subspecies The Journal of the Bombay Natural History Society 41 3 4 514 517 Koepfli K P amp Wayne R K 1998 Phylogenetic relationships of otters Carnivora Mustelidae based on mitochondrial cytochrome B sequences Journal of Zoology 246 4 401 416 doi 10 1111 j 1469 7998 1998 tb00172 x Koepfli K P Kanchanasaka B Sasaki H Jacques H Louie K D Y Hoai T Dang N X Geffen E Gutleb A Han S Heggberget T M LaFontaine L Lee H Melisch R Ruiz Olmo J Santos Reis M Sidorovich V E Stubbe M amp Wayne R K 2008 Establishing the foundation for an applied molecular taxonomy of otters in Southeast Asia PDF Conservation Genetics 9 6 1589 1604 doi 10 1007 s10592 007 9498 5 S2CID 24619297 Moretti B Al Sheikhly O F Guerrini M Theng M Gupta B K Haba M K Khan W A Khan A A amp Barbanera F 2017 Phylogeography of the smooth coated otter Lutrogale perspicillata distinct evolutionary lineages and hybridization with the Asian small clawed otter Aonyx cinereus Scientific Reports 7 41611 Bibcode 2017NatSR 741611M doi 10 1038 srep41611 PMC 5269716 PMID 28128366 Blanford W T 1888 Lutra leptonyx The clawless Otter The Fauna of British India Including Ceylon and Burma Vol Mammalia London Taylor and Francis pp 187 188 Pocock R I 1921 On the External Characters of some Species of Lutrinae Otters Proceedings of the Zoological Society of London 37 3 535 545 doi 10 1111 j 1096 3642 1921 tb03279 x a b c Timmins W H 1971 Observations on breeding the oriental short clawed otter Amblonyx cinerea at Chester Zoo International Zoo Yearbook 11 109 111 doi 10 1111 j 1748 1090 1971 tb01868 x Pocock R I 1941 Genus Amblonyx Rafinesque The Fauna of British India including Ceylon and Burma Vol Mammalia II London Taylor and Francis pp 303 317 a b Borgwardt N amp Culik B M 1999 Asian small clawed otters Amblonyx cinerea resting and swimming metabolic rates Journal of Comparative Physiology B Biochemical Systemic and Environmental Physiology 169 2 100 106 doi 10 1007 s003600050199 PMID 10227184 S2CID 22682528 Melisch R Kusumawardhani L Asmoro P B amp Lubis I R 1996 The otters of west Java a survey of their distribution and habitat use and a strategy towards a species conservation programme Bogor Indonesia Wetlands International Indonesia Programme Jefferies D J 1989 The Asian short clawed otter Amblonyx cinerea Illiger living wild in Britain Otters Earsham 2 3 21 25 Jefferies D J 1991 Another record of an Asian short clawed otter living free in Oxford with notes on its implications Journal of the Otter Trust 2 2 9 12 Hutton A F 1949 Notes on the Snakes and the Mammals of the High Wavy Mountains Madura District South India Part II Mammals Journal of the Bombay Natural History Society 48 4 681 694 a b c d Foster Turley P 1992 Conservation ecology of sympatric Asian ottersAonyx cinereaandLutra perspicillata PhD Dissertation Gainesville Florida University of Florida Aziz M A 2018 Notes on population status and feeding behaviour of Asian Small clawed otter Aonyx cinereus in the Sundarbans mangrove forest of Bangladesh IUCN Otter Specialist Group Bulletin 35 1 3 10 Sivasothi N amp Nor B H M 1994 A review of otters Carnivora Mustelidae Lutrinae in Malaysia and Singapore Hydrobiologia 285 1 3 1 3 doi 10 1007 BF00005663 S2CID 44011643 Fish F E 1994 Association of propulsive swimming mode with behaviour in the river otters Lutra canadensis Journal of Mammalogy 75 4 989 997 doi 10 2307 1382481 JSTOR 1382481 Kruuk H Kanchanasaka B O Sullivian S amp Wanghongsa S 1994 Niche separation in three sympatric otters Lutra perspicillata Lutra lutra and Aonyx cinerea in Huai Kha Khaeng Thailand Biological Conservation 69 115 210 doi 10 1016 0006 3207 94 90334 4 a b c Lancaster W E 1975 Exhibiting and breeding the Asian small clawed otter at Adelaide Zoo International Zoo Yearbook 15 63 65 doi 10 1111 j 1748 1090 1975 tb01355 x Sobel G 1996 Development and validation of noninvasive fecal steroid monitoring procedures for the Asian small clawed otter Aonyx cinerea Master of Science Gainesville Florida University of Florida Maslanka M T amp Crissey S D 1998 Nutrition and diet In Lombardi D amp O Connor J eds Asian small clawed otter Aonyx cinerea husbandary manual Powell Ohio Columbus Zoological Gardens and AZA Asian Small Clawed Otter SSP pp 1 18 Gomez L amp Bouhuys J 2018 Illegal Otter Trade in Southeast Asia PDF Kelana Jaya Selangor Malaysia Traffic Southeast Asia Regional Office Gomez L amp Shepherd C R 2019 Stronger International Regulations and Increased Enforcement Effort is needed to end the Illegal Trade in Otters in Asia PDF IUCN Otter Specialist Group Bulletin 36 2 71 76 DTE Staff 2019 CITES CoP 2019 Otters given highest protection from trade DownToEarth Foster Turley P amp Engfar S 1988 The Species Survival Plan for the Asian small clawed otter Aonyx cinerea International Zoo Yearbook 27 79 84 doi 10 1111 j 1748 1090 1988 tb03199 x Foster Turley P 1986 A progress report on the species survival plan for Asian small clawed otters in United States zoos Otter Specialist Group Bulletin 1 19 21 Zoo Nachwuchs sorgt fur Trubel Zoo Basel in German 2012 Kim I S Sim J H Cho J W Kim B Lee Y Ahn D 2020 Osteoporosis in an Asian small clawed otter Aonyx cinereus Illiger 1815 Journal of Veterinary Medical Science 82 3 376 378 doi 10 1292 jvms 19 0546 PMC 7118488 PMID 32009030 External links edit nbsp Wikispecies has information related to Aonyx cinerea nbsp Wikimedia Commons has media related to Aonyx cinerea Asian Small clawed Otter IUCN Otter Specialist Group Aonyx cinerea Oriental small clawed otter Animal Diversity Web Asian small clawed otter Smithsonian s National Zoo amp Conservation Biology Institute 25 April 2016 Ban on endangered otter trade to take effect amid pet boom in Japan Kyodo News 2019 Retrieved from https en wikipedia org w index php title Asian small clawed otter amp oldid 1180595778, wikipedia, wiki, book, books, library,

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