White-winged duck

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White-winged duck
At Sylvan Heights Waterfowl Park, North Carolina, United States
CITES Appendix I (CITES)[2]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Anseriformes
Family: Anatidae
Genus: Asarcornis
Salvadori, 1895
Species:
A. scutulata
Binomial name
Asarcornis scutulata
(Müller, 1842)
Synonyms

Cairina scutulata

The white-winged duck or white-winged wood duck (Asarcornis scutulata) is a large species of

monotypic genus, as Asarcornis scutulata, which is evolutionarily closer to the redhead (Aythya americana, one of the diving ducks).[3][4]

Description

This is one of the largest living species of duck next only to the steamer ducks which are heavier. The Muscovy duck also attains sizes that nearly rival the white-winged duck, but may average a bit smaller in a wild state. Length is 66–81 cm (26–32 in) and wingspan is 116–153 cm (46–60 in).[5] Males weigh 2.94–3.9 kg (6.5–8.6 lb), while females weigh 1.95–3.05 kg (4.3–6.7 lb).[6][7] The most noticeable feature on adult birds, is the dark body contrasting with a whitish head and neck. Males have mostly dull yellowish bill, blackish mottling on the head and upper neck, white lesser median coverts and inner edges of tertials and bluish-grey secondaries. In flight, white wing-coverts contrast with the rest of the wings. Females are smaller and usually have more densely mottled head and upper neck. The juvenile is duller and browner.[8]

This secretive species is only known to feed at night. Its diet consists of seeds, aquatic plants, grain, rice, snails, small fish and insects.[6] It inhabits stagnant or slow-flowing natural and artificial wetlands, within or adjacent to evergreen, deciduous or swamp forests, on which it depends for roosting and nesting, usually in tree holes. Although lowlands (below c.200 m) provide optimum habitat, it occurs up to 1,400 m of altitude, especially on plateaus supporting sluggish perennial rivers and pools.[8]

Distribution and status

Historically, the white-winged duck was widely distributed from northeastern

Burma.[10]

In Malaysia, it has been confirmed by IUCN that this duck is possibly extinct.

In India, the key protected areas for the white-winged duck are Dibru-Saikhowa National Park, Dihing-Patkai Wildlife Sanctuary, Nameri National Park and Namdapha National Park.[11]

The white-winged duck occurs in dense tropical evergreen forests, near rivers and swamps.[12]

They tend to nest in tree cavities, and are threatened in part since the destruction of hollow trees is destroying their nesting localities. The draining of swamps and rivers and other forms of habitat destruction is also destroying the habitat that they could survive in. Additional threats include loss of genetic variability, disturbance, hunting, and collection of eggs and chicks for food or pets.[13]

Due to ongoing habitat loss, a small population size, and because this duck is hunted for food, eggs and pets, the white-winged duck is evaluated as

pulp and paper company. The plantations, at least temporarily, provide suitable habitat between periodic harvests (once every 4–5 years). The ducks are frequently observed along canals where large and overhanging Acacia trees provide shade and cover from predators and a haven in which to feed and rest. The quiet and still water in the canals of the plantations provides an undisturbed and secluded location, away from local communities which may hunt the ducks or collect their eggs. Nearby, natural forest conservation areas and greenbelts also provide suitable nesting and roosting habitat in close proximity to the canals.[citation needed
]

It is the state bird of the Indian state of Assam.

There have been efforts to preserve the population by breeding in captivity in England. It has been seen that they do well under shady, dimly-lit conditions, but there is also a higher chance for them to contract avian tuberculosis.[14]

References

  1. ^
    doi:10.2305/IUCN.UK.2017-1.RLTS.T22680064A110103586.en
    . Retrieved 12 November 2021.
  2. ^ "Appendices | CITES". cites.org. Retrieved 14 January 2022.
  3. JSTOR 4089339
    .
  4. ^ Carboneras, C. & Kirwan, G.M. (2019). White-winged Duck (Asarcornis scutulata). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/52847 on 14 July 2019).
  5. ISBN 978-1-84330-328-2
  6. ^ a b Cairina scutulata – White-winged duck. wildpro.twycrosszoo.org
  7. ISBN 978-1-4200-6444-5
    .
  8. ^ a b White-winged Duck Cairina scutulata. Birdlife International. birdlife.org
  9. ^ Choudhury, A.U. (1996). Survey of the white-winged wood duck and the Bengal florican in Tinsukia district & adjacent areas of Assam and Arunachal Pradesh. The Rhino Foundation for Nature in North East India, Guwahati, India.
  10. ^ "White-winged Duck Asarcornis scutulata". BirdLife International. Retrieved 21 September 2014.
  11. ISBN 8190086618
    .
  12. ^ White Winged Wood Duck. WWF India. Retrieved on 2013-04-05.
  13. ISBN 978-0-7614-7198-1
    .
  14. ISSN 2052-6458
    .

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=White-winged_duck&oldid=1204559980"