West Indian whistling duck

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West Indian whistling duck
West Indian Whistling-Duck (Dendrocygna arborea) RWD4.jpg
West Indian whistling duck (Dendrocygna arborea) head.JPG
CITES Appendix II (CITES) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Anseriformes
Family: Anatidae
Genus: Dendrocygna
Species:
D. arborea
Binomial name
Dendrocygna arborea
Dendrocygna arborea map.svg
Synonyms

Anas arboreaLinnaeus, 1758

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.

Contents

Taxonomy

The West Indian whistling duck was formally described in 1758 by the Swedish naturalist Carl Linnaeus in the tenth edition of his Systema Naturae under the binomial name Anas arborea. [3] [4] Linnaeus based his account on the descriptions by earlier authors. In 1725 the Irish physician, naturalist and collector Hans Sloane had described and illustrated the "Whistling-Duck" in the second volume of his A Voyage to the Islands Madera, Barbados, Nieves, S. Christophers and Jamaica. Sloane noted that it was common on the island of Jamaica. [5] The English naturalist George Edwards had included a description and a hand-coloured illustration of the "Black-bill'd whistling Duck" in the fourth volume of his A Natural History of Uncommon Birds that was published in 1751. Edwards had been able to examine a specimen at the home of Admiral Sir Charles Wager at Stanley House in Chelsea, west London. [6]

The West Indian whistling duck is now one of eight species placed in the genus Dendrocygna that was introduced in 1837 by the English naturalist William Swainson. The species is treated as monotypic: no subspecies are recognised. [7] The genus name combines the Ancient Greek dendron meaning "tree" with the genus Cygnus . The specific epithet arborea is from Latin arboreus meaning "tree". [8]

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. [9] 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.

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.

Behaviour

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.

Food and feeding

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.

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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. Linnaeus, Carl (1758). Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis (in Latin). Vol. 1 (10th ed.). Holmiae (Stockholm): Laurentii Salvii. p. 128.
  4. Mayr, Ernst; Cottrell, G. William, eds. (1979). Check-List of Birds of the World. Vol. 1 (2nd ed.). Cambridge, Massachusetts: Museum of Comparative Zoology. p. 429.
  5. Sloane, Hans (1725). A Voyage to the Islands Madera, Barbados, Nieves, S. Christophers and Jamaica : with the natural history of the herbs and trees, four-footed beasts, fishes, birds, insects, reptiles, &c. of the last of those islands. Vol. 2. London: Printed for the author. p.  324, Plate 272.
  6. Edwards, George (1751). A Natural History of Uncommon Birds. Vol. 4. London: Printed for the author at the College of Physicians. p. 193, Plate 193.
  7. Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (December 2023). "Screamers, ducks, geese & swans". IOC World Bird List Version 14.1. International Ornithologists' Union. Retrieved 15 July 2024.
  8. Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp.  133, 53. ISBN   978-1-4081-2501-4.
  9. 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.