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mallard duck
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mallard (Anas platyrhynchos)
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The mallard duck can cross breed with 63 other species, posing a severe threat to indigenous waterfowl's genetic integrity.
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However, all the Hawaiian ducks in the reestablished populations have bred with feral mallard ducks and have produced hybrid offspring that are fully fertile (Griffin et al. 1989); consequently, "pure" Hawaiian ducks are still only found on Kauaʻi.
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Almost all the varieties of domestic ducks are descended from the mallard (Anas platyrhynchos), apart from the Muscovy duck (Cairina moschata).
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The hybrids of mallards and the yellow-billed duck are fertile, capable of producing hybrid offspring.
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The Muscovy duck can be crossed with mallards in captivity to produce hybrids, known as mulard duck ("mule duck") because they are sterile.
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The Mariana mallard was a resident allopatric population – in most respects a good species – apparently initially derived from mallard-Pacific black duck hybrids; unfortunately, it became extinct in the late 20th century.
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This is supported by the observation that in mallard × American black duck hybrids, females of both taxa prefer the sexually dimorphic mallard drakes over the dull-plumaged black duck drakes; that the green-winged teal is in some aspects—such as the less contrasting nuptial plumage—intermediate between the common and speckled teal is also interesting to note.
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Including the Mexican duck in the mallard is a relic from the usual practice of much of the mid-late 20th century, when all North American "mallardines" as well as the Hawaiian and Laysan ducks were included in the mallard proper as subspecies.
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These non-migratory mallards interbreed with indigenous wild ducks from local populations of closely related species through genetic pollution by producing fertile offspring.
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Due to the outward similarity of Meller's duck to the female mallard, it was commonly placed close to that species.
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Male mallards also occasionally chase other male ducks of a different species, and even each other, in the same way.
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Due to the variability of the mallard's genetic code, which gives it its vast interbreeding capability, mutations in the genes that decide plumage colour are very common and have resulted in a wide variety of hybrids such as Brewer's duck (mallard × gadwall, Anas strepera).
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As in all members of the "mallardine" clade of ducks, they are able to produce fertile hybrids with their close relatives, the American black duck and the mallard.
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Mallards are causing severe "genetic pollution" to South Africa's biodiversity by breeding with endemic ducks even though the Agreement on the Conservation of African-Eurasian Migratory Waterbirds – an agreement to protect the local waterfowl populations – applies to the mallard as well as other ducks.
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Among North America's duck species, northern shovelers trail only mallards and blue-winged teal in overall abundance.
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The American black duck and the local mallard are now very hard to distinguish by means of microsatellite comparisons, even if many specimens are sampled.
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The taxonomic status of the Mariana mallard is disputed, since it resembles an intermediate of the mallard and the Pacific black duck, two closely related allopatric species which frequently hybridise.
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Its long neck enables it to take food items from the bottom of water bodies up to 30 cm (12 in) deep, which are beyond the reach of other dabbling ducks like the Mallard.
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Yoshimaro Yamashina examined those specimens in Japanese museums in 1948, and decided that the Mariana mallard was an example of hybrid speciation, and was descended from the mallard and the Pacific black duck's Palau subspecies (Anas superciliosa pelewensis).
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Its closest relatives is apparently the yellow-billed duck, another early divergence of the mallard clade, in which these species and the African black duck are basal, but the exact relationships of Meller's and the yellow-billed ducks to that species are fairly obscure.
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The underside was a mix between the vermiculated grey feathers of the mallard and the brown ones of the Pacific black duck.
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They formerly occurred on the Hawaiian Islands and were derived from dabbling ducks, possibly even a close ancestor of the mallard: Chelychelynechen Thambetochen Ptaiochen Subfossil remains of a small, flightless dabbling duck have been recovered on Rota in the Mariana Islands.
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It was assumed that far more mallard drakes mate with grey duck females than vice versa based on the fact that most hybrids show a mallard-type plumage, but this is not correct; it appears that the mallard phenotype is dominant, and that the degree to which species contributed to a hybrid's ancestry cannot be determined from the plumage.
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Its taxonomic status is debated, and it has variously been treated as a full species, a subspecies of the mallard or of the Pacific black duck, or sometimes as a subspecies of the Indian spot-billed duck.
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Muscovy breeds are popular because they have stronger-tasting meat—sometimes compared to roasted beef—than the usual domestic ducks which are descendants of the mallard (Anas platyrhynchos).
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