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Biology

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The West Indian whistling-duck is considered a non-migratory bird and is active at night and at dusk and dawn. By day, single birds, pairs or flocks with up to 100 individuals come together to roost and occasionally feed in mangroves and swampy areas. At dusk they fly to other areas to feed in small flocks and return to their roost-sites just before dawn (2). Nests are made between palm fronds, in clumps of bromeliads, on branches or in tree-cavities, though in Antigua they are built by scraping a shallow ditch in the ground and lining it with leaves (5). Pairs breed throughout the year, but there are peaks in the summer months (2).
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Conservation

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The listing of this species on Appendix II of the Convention on International Trade in Endangered Species (CITES) and the Convention on Migratory Species (CMS) legally protects it throughout much of its range (3)(4). However, law enforcement is inadequate. To improve conservation measures, in 1997 The West Indian Whistling-duck Working Group was set up. At present this vulnerable duck does exist in several protected areas, but it is thought that suitable habitat for it is insufficient (2). Conservation aims are now focussing on conducting extensive population and habitat surveys, monitoring current populations, enforcing better protection and increasing public awareness of this species' fragile status (5).
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Description

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The West Indian whistling-duck is a large, upright, long-necked duck. Adults are deep brown in colour, with black-and-white markings on the flanks, a whitish abdomen and black bill (2). This species can also be identified by its shrill'chiriria' whistle (5).
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Habitat

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Inhabits mangrove and swamp areas, brackish ponds, wetlands and tidal flats (5).
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Range

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As the name suggests this bird is found in the West Indies. Historically, this bird occurred throughout the Bahamas, Turks, Caicos Islands, Cuba, Cayman Islands, Jamaica, Haiti, Dominican Republic, Puerto Rico, Virgin Islands, St Kitts and Nevis, Antigua and Barbuda, and Guadeloupe. At present, breeding populations are known to exist in the Bahamas (at least 1,500 birds), Turks and Caicos, Cuba (possibly more than 10,000 with at least 6,000 in the east), Cayman (1,000 and increasing), Jamaica (500 and declining), Dominican Republic, Puerto Rico (100 and declining), Antigua (400) and Barbuda (possibly 2,000) (2).
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Status

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Classified as Vulnerable (VU B1+2abcde) on the IUCN Red List 2003 (1), listed on Appendix II of CITES (3), and on Appendix II of the Convention on Migratory Species (CMS) (4).
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Threats

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This large duck is threatened by poorly regulated and excessive hunting for food, eggs and sport (2). It depends on wetland habitats for food sources, protection and breeding, and so has suffered serious population losses following the rapid development of coastal areas in the Caribbean for development and agriculture (5). Of the remaining wetland habitats, 50% are severely degraded due the removal of mangroves and swamp-forest, pollution (especially over-use of pesticides) and natural catastrophes such as droughts and hurricanes (2). The populations of the West Indian whistling-duck are now small and fragmented (2).
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West Indian whistling duck

provided by wikipedia EN

The West Indian whistling duck (Dendrocygna arborea) is a whistling duck that breeds in the Caribbean. Alternative names are black-billed whistling duck and Cuban whistling duck.

Distribution

The West Indian whistling duck is widely scattered throughout the West Indies, including a large breeding population in the Bahamas, and smaller numbers in Cuba, the Cayman Islands, Antigua and Barbuda, Jamaica, Hispaniola (both the Dominican Republic and Haiti), and Puerto Rico. It is largely sedentary, apart from local movements, which can be 100 km or more.

Description

The West Indian whistling duck is the largest and darkest of the whistling ducks with a length of 48 to 58 cm (19 to 23 in). The female weighs from 800 to 1,320 g (1.76 to 2.91 lb) and the male weighs from 760 to 1,240 g (1.68 to 2.73 lb); this species is about the size of a mallard.[3] It has a long black bill, long head and longish legs. It has a pale foreneck and light brown face. The crown, back, breast and wings are dark brown to black, and the rest of the underparts are white with heavy black markings.

All plumages are similar, except that juveniles are duller and have a less contrasted belly pattern.

Breeding

Nests have been reported in tree cavities, on branches, in clumps of bromeliads, and on the ground under thatch palms and other dense bushes. The usual clutch size is 10-16 eggs. It habitually perches in trees, which gives rise to its specific name.

Diet and behavior

The birds are mostly nocturnal and secretive, inhabiting wooded swamps and mangroves, where this duck roosts and feeds on plant food including the fruit of the royal palm.

Threats

The West Indian whistling duck has suffered extensive hunting for its eggs and for sport. Wetlands are a very limited habitat in the Caribbean, with continuing conversion for development and agriculture. More than 50% of remaining wetlands are seriously degraded by the cutting of mangroves and swamp-forest, pollution (especially over-use of pesticides1) and natural catastrophes such as droughts and hurricanes. Predation is inadequately documented but may be a factor.

Current conservation measures

D. arborea is ranked under CITES Appendix II, as well as CMS Appendix II. It is legally protected throughout much of its range, but law enforcement is inadequate. The West Indian Whistling Duck Working Group initiated a conservation programme in 1997. There are several protected areas in the region but, in general, suitable habitat, especially wetlands, is under-represented. Ducks are predated on Antigua and Barbuda by the small Indian mongooses introduced to control the cane rats which was largely unsuccessful as the rats live in trees.

Proposed conservation measures

Conduct extensive surveys to assess numbers and distribution; assist local authorities in establishing a long-term monitoring programme; conserve key sites; enforce legal protection; initiate public education and awareness programmes.

References

  1. ^ BirdLife International (2019). "Dendrocygna arborea". IUCN Red List of Threatened Species. 2019: e.T22679770A154611660. doi:10.2305/IUCN.UK.2019-3.RLTS.T22679770A154611660.en. Retrieved 12 November 2021.
  2. ^ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. ^ Carboneras, C. and G. M. Kirwan (2020). West Indian Whistling-Duck (Dendrocygna arborea), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA.
  • Wildfowl by Madge and Burn, ISBN 0-7470-2201-1
  • Staus, N.L. 1998. Behavior and natural history of the West Indian Whistling Duck on Long Island, Bahamas. Wildfowl 49: 194–206.

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West Indian whistling duck: Brief Summary

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The West Indian whistling duck (Dendrocygna arborea) is a whistling duck that breeds in the Caribbean. Alternative names are black-billed whistling duck and Cuban whistling duck.

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