Tadorna

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Shelducks
Tadorna tadorna (aka).jpg
Female common shelduck
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Anseriformes
Family: Anatidae
Subfamily: Tadorninae
Genus: Tadorna
F. Boie, 1822
Type species
Anas tadorna
Linnaeus, 1758
Species

T. ferruginea
T. cana
T. tadornoides
T. variegata
T. cristata
T. tadorna

Synonyms

see text

The shelducks, most species of which are found in the genus Tadorna (except for the Radjah shelduck, which is now found in its own monotypic genus Radjah), are a group of large birds in the Tadorninae subfamily of the Anatidae, the biological family that includes the ducks and most duck-like waterfowl such as the geese and swans.

Biology[edit]

Shelducks are a group of large, often semi-terrestrial waterfowl, which can be seen as intermediate between geese (Anserinae) and ducks. They are mid-sized (some 50–60 cm) Old World waterfowl. The sexes are colored slightly differently in most species, and all have a characteristic upperwing coloration in flight: the tertiary remiges form a green speculum, the secondaries and primaries are black, and the coverts (forewing) are white. Their diet consists of small shore animals (winkles, crabs etc.) as well as grasses and other plants.

They were originally known as "sheldrakes", which remained the most common name until the late 19th century.[1] The word is still sometimes used to refer to a male shelduck and can also occasionally refer to the canvasback (Aythya valisineria) of North America.[2]

Systematics[edit]

The genus Tadorna was introduced by the German zoologist Friedrich Boie in 1822.[3][4] The type species is the common shelduck.[4] The genus name comes from the French name Tadorne for the common shelduck.[5] It may originally derive from Celtic roots meaning "pied waterfowl", essentially the same as the English "shelduck".[6] A group of them is called a "dopping," taken from the Harley Manuscript.[7]

The namesake genus of the Tadorninae, Tadorna is very close to the Egyptian goose and its extinct relatives from the Madagascar region, Alopochen. While the classical shelducks form a group that is obviously monophyletic, the interrelationships of these, the aberrant common and especially Radjah sheducks, and the Egyptian goose were found to be poorly resolved by mtDNA cytochrome b sequence data;[8] this genus may thus be paraphyletic.

The Radjah sheduck, formerly placed in the genus Tadorna, is now placed in its own monotypic genus:

Fossil bones from Dorkovo (Bulgaria) described as Balcanas pliocaenica may actually belong to this genus. They have even been proposed to be referable to the common shelduck, but their Early Pliocene age makes this rather unlikely.

Phylogeny[edit]

Based on the Taxonomy in Flux from John Boyd's website.[9]

Tadornina

Radjah radjah (Lesson 1828) Reichenbach 1852 (Radjah shelduck)

Alopochen Stejneger 1885

Tadorna

?†T. cristata (Kuroda 1917) (Crested shelduck)

T. tadorna (Linnaeus 1758) (Common shelduck)

T. cana (Gmelin 1789) (South African shelduck)

T. ferruginea (Pallas 1764) (Ruddy shelduck)

T. tadornoides (Jardine & Selby 1828) (Australian shelduck)

T. variegata (Gmelin 1789) (Paradise shelduck)

Table of species[edit]

The following table is based on the HBW and BirdLife International Illustrated Checklist of the Birds of the World.[10][11]

Image Scientific name Common name Distribution Conservation status
Common.shelduck.2.arp.750pix.jpg Gravand (Tadorna-tadorna)- Ystad-2017.jpg T. tadorna Common shelduck Europe, Asia, N. Africa LC IUCN
Tadorna ferruginea (Pallas 1764).jpg Rostgans Tadorna ferruginea Zoo Augsburg-01.jpg T. ferruginea Ruddy shelduck Europe, Asia, N. Africa LC IUCN
Tadorna cana - 01.jpg Tadorna cana333863547.jpg T. cana South African shelduck Namibia, Botswana, South Africa LC IUCN
Tadorna tadornoides male 1 - Perth.jpg Tadorna tadornoides female 1 - Perth.jpg T. tadornoides Australian shelduck Australia, New Zealand LC IUCN
Tadorna variegata -New Zealand -male-8.jpg Tadorna variegata -near Kekerengu, South Island, New Zealand -female-8.jpg T. variegata Paradise shelduck New Zealand LC IUCN
Shiryou k.jpg T. cristata Crested shelduck Eastern Russia, East Asia CR IUCN

References[edit]

  1. ^ Lockwood, W. B. (1984). Oxford Book of British Bird Names. Oxford University Press.
  2. ^ Simpson, J. A. (1989). Oxford English Dictionary. Oxford University Press.
  3. ^ Boie, Friedrich (1822). Tagebuch gehalten auf einer Reise durch Norwegen im Jahre 1817 (in German). Schleswig: Königl Taubstummen - Institut. pp. 140, 351.
  4. ^ a b Dickinson, E.C.; Remsen, J.V., Jr., eds. (2013). The Howard & Moore Complete Checklist of the Birds of the World. Vol. 1: Non-passerines (4th ed.). Eastbourne, UK: Aves Press. p. 13. ISBN 978-0-9568611-0-8.
  5. ^ Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 377. ISBN 978-1-4081-2501-4.
  6. ^ Kear, Janet (2005). Ducks, Geese, and Swans. Oxford University Press. p. 420. ISBN 0-19-861008-4.
  7. ^ Lipton, James (1991). An Exaltation of Larks. Viking. ISBN 978-0-670-30044-0.
  8. ^ Sraml, M.; Christidis, L.; Easteal, S.; Horn, P. & Collet, C. (1996). Molecular Relationships Within Australasian Waterfowl (Anseriformes). Australian Journal of Zoology 44(1): 47-58. doi:10.1071/ZO9960047 (HTML abstract)
  9. ^ Taxonomy in Flux [1] Boyd, John (2007). "Tadornini" (PDF). Retrieved 30 August 2016.
  10. ^ del Hoyo, J. & Collar, N. J. (2014). HBW and BirdLife International Illustrated Checklist of the Birds of the World I: Non-passerines. Lynx Edicions. pp. 134–135. ISBN 978-8496553941.{{cite book}}: CS1 maint: multiple names: authors list (link)
  11. ^ "HBW and BirdLife Taxonomic Checklist v5". BirdLife International. 2020. Retrieved 21 May 2021.