The gadwall was first described by Linnaeus in 1758 in his Systema naturae, under its current scientific name. DNA studies have shown that it is a sister species with the falcated duck, and that these two are closely related to the wigeons. There two subspecies:
- A. s. strepera, described by Linnaeus, is the nominate subspecies.
- A. s. couesi, Coues' gadwall, extinct circa 1874, was formerly found on Teraina, a coral atoll in the Pacific Ocean.
The gadwall is 46–56 cm (18–22 in) long with a 78–90 cm (31–35 in) wingspan. The male is slightly larger than the female, weighing on average 990 g (35 oz) against her 850 g (30 oz). The breeding male is patterned grey, with a black rear end, light chestnut wings, and a brilliant white speculum, obvious in flight or at rest. In non-breeding (eclipse) plumage, the drake looks more like the female, but retains the male wing pattern, and is usually greyer above and has less orange on the bill.
The female is light brown, with plumage much like a female mallard. It can be distinguished from that species by the dark orange-edged bill, smaller size, the white speculum, and white belly. Both sexes go through two moults annually, following a juvenile moult.
The gadwall is a quieter duck, except during its courtship display. Females give a call similar to the quack of a female mallard but higher-pitched, transcribed as gag-ag-ag-ag. Males give a grunt, transcribed as nheck, and a whistle.
The gadwall breeds in the northern areas of Europe and Asia, and central North America. In North America, its breeding range lies along the Saint Lawrence River, through the Great Lakes, Alberta, Saskatchewan, the Dakotas, south to Kansas, west to California, and along coastal Pacific Canada and southern coastal Alaska. The range of this bird appears to be expanding into eastern North America. This dabbling duck is strongly migratory, and winters farther south than its breeding range, from coastal Alaska, south into Central America, and east into Idaho, Kansas, Ohio, Virginia, and then south all the way into Central America. Its conservation status is Least Concern.
In Great Britain, the gadwall is a scarce-breeding bird and winter visitor, though its population has increased in recent years. It is likely that its expansion was partly through introduction, mainly to England, and partly through colonization to Great Britain, with continental birds staying to breed in Scotland. It has been reported in the River Avon in Hampshire and Wiltshire. In Ireland a small breeding population has recently become established, centred on Wexford in the south and Lough Neagh in the north.
The gadwall is a bird of open wetlands, such as prairie or steppe lakes, wet grassland or marshes with dense fringing vegetation, and usually feeds by dabbling for plant food with head submerged. It nests on the ground, often some distance from water. It is not as gregarious as some dabbling ducks outside the breeding season and tends to form only small flocks. This is a fairly quiet species; the male has a hoarse whistling call, and the female has a Mallard-like quack. The young birds are fed insects at first; adults also eat some molluscs and insects during the nesting season. The gadwall is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.
- BirdLife International (2012). "Anas strepera". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- Linnaeus, C. (1758). Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. (in Latin). Holmiae. (Laurentii Salvii). p. 125. Retrieved 10 August 2014. "A. macula alarum rufa nigra alba."
- Johnson, Kevin P.; Sorenson, Michael D. (1999). "Phylogeny and biogeography of dabbling ducks (genus: Anas): A comparison of molecular and morphological evidence" (PDF). The Auk 116 (3): 792–805. doi:10.2307/4089339.
- "ITIS Report: Anas strepera". Integrated Taxonomic Information System. Retrieved 10 August 2014.
- Hume, Julian P.; Walters, Michael (2012). Extinct Birds. London, UK: T. & A. D. Poyser. p. 48. ISBN 978-1-4081-5725-1. Retrieved 10 August 2014.
- "gadwall". Merriam-Webster. Retrieved 24 August 2011.
- Floyd, 2008[page needed]
- Madge, Steve; Burn, Hilary (1988). Wildfowl: An Identification Guide to the Ducks, Geese and Swans of the World. Christopher Helm. pp. 200–202. ISBN 0-7470-2201-1.
- Dunn and Alderfer, 2006[page needed]
- Irish Birds 9: 68. 2010.
- Forktail 15: 87.
- Clements, James (2007). The Clements Checklist of the Birds of the World. Ithaca: Cornell University Press.
- Floyd, T. (2008). Smithsonian Field Guide to the Birds of North America. New York: HarperCollins.
|Wikimedia Commons has media related to Gadwall.|
|Wikispecies has information related to: Anas strepera|
|Wikisource has the text of the 1911 Encyclopædia Britannica article Gadwall.|
- BirdLife species factsheet for Pitangus sulphuratus
- RSPB Birds by Name Gadwall Page
- Gadwall Species Account – Cornell Lab of Ornithology
- Gadwall - Anas strepera - USGS Patuxent Bird Identification InfoCenter
- Gadwal at the Massachusetts Breeding Bird Atlas
- Gadwall videos, photos, and sounds at the Internet Bird Collection
- Gadwall photo gallery at VIREO (Drexel University)