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Thalassornis leuconotus

Thalassornis leuconotus (*)

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis: Sarcopterygii
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Ordo: Saurischia
Cladus: Eusaurischia
Cladus: Theropoda
Cladus: Neotheropoda
Cladus: Averostra
Cladus: Tetanurae
Cladus: Avetheropoda
Cladus: Coelurosauria
Cladus: Tyrannoraptora
Cladus: Maniraptoromorpha
Cladus: Maniraptoriformes
Cladus: Maniraptora
Cladus: Pennaraptora
Cladus: Paraves
Cladus: Eumaniraptora
Cladus: Avialae
Infraclassis: Aves
Cladus: Euavialae
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Euornithes
Cladus: Ornithuromorpha
Cladus: Ornithurae
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Pangalloanserae
Cladus: Galloanseres
Ordo: Anseriformes

Familia: Anatidae
Subfamilia: Thalassorninae
Genus: Thalassornis
Species: Thalassornis leuconotus
Name

Thalassornis leuconotus Eyton, 1838
References

T.C. Eyton A monograph on the anatidae, or duck tribe. p. 168

Vernacular names
čeština: Husička krátkoocasá
English: White-backed Duck
français: Érismature à dos blanc, Dendrocygne à dos blanc
русский: Белоспинная утка
svenska: Vitryggad and

The white-backed duck (Thalassornis leuconotus) is a waterbird of the family Anatidae. It is distinct from all other ducks, but most closely related to the whistling ducks in the subfamily Dendrocygninae, though also showing some similarities to the stiff-tailed ducks in the subfamily Oxyurinae. It is the only member of the genus Thalassornis.

Description

These birds are well adapted for diving. On occasions they have been observed to stay under water for up to half a minute. They search especially for the bulbs of waterlilies, but also seeds and leaves of waterlilies and other water plants and the young feed on lake flies larvae as well.[1] From danger, they also escape preferentially by diving; hence, the namesake white back is hardly visible in life.

Distribution and habitat

White-backed ducks live in Africa, especially between Senegal and Chad in the west, Ethiopia in the east, and South Africa in the south. Their habitat consists of lakes, ponds, swamps and marshes where they are well camouflaged against predators.
Subspecies

There are two subspecies, Thalassornis leuconotus leuconotus and Thalassornis leuconotus insularis. The latter lives entirely on Madagascar and is considered endangered as a result of hunting, habitat loss and the introduction of competing exotic species.
Conservation

The white-backed duck is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.

Woolaver and Nichols conducted a nesting survey of the Madagascar race in 2001 at Lake Antsamaka in western Madagascar. They found a total of 37, indicating the significance of this single site for the conservation of this insular subspecies.[2] Young, et al. (2006) suggested that an earlier population estimate of 2,500–5,000 total birds in Madagascar by Delany and Scott[3] may be too optimistic.[4] Its African population may be in the range of 10,000 to 25,000 birds.[5][6]
Notes

BirdLife International (2016). "Thalassornis leuconotus". IUCN Red List of Threatened Species. 2016: e.T22679785A92830036. doi:10.2305/IUCN.UK.2016-3.RLTS.T22679785A92830036.en. Retrieved 13 November 2021.
Woolaver. L., and R. Nichols (2006).
Delany & Scott, (2002)
Young, H. G., R. Safford, F. Hawkins, R. Rabarisoa, & F. Razafindrajao (2006).
Kear, J. (2005).

Johnsgard, P. 2010

References

Kear, J. 2005. Ducks, Geese and Swans. 2 vol. Oxford, UK: Oxford Univ. Press.
Woolaver. L., and R. Nichols. 2006. Nesting survey of the white-backed duck at Lake Antsamaka in western Madagascar. TWSG News 15:34–37.
Young, H. G., R. Safford, F. Hawkins, R. Rabarisoa, & F. Razafindrajao, 2006. Madagascar whitebacked duck: What is its true status? TWSG News 15:38–40.
Delany, S., & D. A. Scott. 2006. Waterfowl Population Estimates. 4th ed. Netherlands: Wetlands International.
Johnsgard, P. 2010 "The World’s Waterfowl in the 21st Century: A 2010 Supplement to Ducks, Geese, and Swans of the World"

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