Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Anseriformes Anatidae

Scientific Name: Tadorna tadorna
Species Authority: (Linnaeus, 1758)
Regional Assessments:
Common Name(s):
English Common Shelduck, Shelduck
French Tadorne de Belon
Taxonomic Source(s): del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Ekstrom, J., Butchart, S., Malpas, L.
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is very large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
Previously published Red List assessments:
2009 Least Concern (LC)
2008 Least Concern (LC)
2004 Least Concern (LC)
2000 Lower Risk/least concern (LR/lc)
1994 Lower Risk/least concern (LR/lc)
1988 Lower Risk/least concern (LR/lc)

Geographic Range [top]

Countries occurrence:
Afghanistan; Albania; Algeria; Armenia (Armenia); Austria; Azerbaijan; Bangladesh; Belarus; Belgium; Bhutan; Bosnia and Herzegovina; Bulgaria; China; Croatia; Cyprus; Czech Republic; Denmark; Egypt; Estonia; Finland; France; Germany; Greece; Hong Kong; Hungary; Iceland; India; Iran, Islamic Republic of; Iraq; Ireland; Israel; Italy; Japan; Jordan; Kazakhstan; Korea, Democratic People's Republic of; Korea, Republic of; Kuwait; Kyrgyzstan; Latvia; Lebanon; Libya; Lithuania; Macedonia, the former Yugoslav Republic of; Malta; Moldova; Mongolia; Montenegro; Morocco; Netherlands; Norway; Oman; Pakistan; Palestinian Territory, Occupied; Poland; Portugal; Qatar; Romania; Russian Federation; Saudi Arabia; Serbia (Serbia); Slovakia; Slovenia; Spain (Canary Is. - Vagrant); Sweden; Switzerland; Syrian Arab Republic; Tajikistan; Tunisia; Turkey; Turkmenistan; Ukraine; United Arab Emirates; United Kingdom; Uzbekistan; Yemen
Bahrain; Ethiopia; Ghana; Gibraltar; Guinea-Bissau; Lao People's Democratic Republic; Liechtenstein; Luxembourg; Mauritania; Myanmar; Nepal; Philippines; Senegal; Sudan; Taiwan, Province of China; Thailand; Viet Nam
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 2200000
Continuing decline in extent of occurrence (EOO): Unknown
Extreme fluctuations in extent of occurrence (EOO): No
Continuing decline in number of locations: Unknown
Extreme fluctuations in the number of locations: No
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The global population is estimated to number c.580,000-710,000 individuals (Wetlands International 2006), while national population sizes have been estimated at c.100-10,000 breeding pairs and c.50-1,000 wintering individuals in China and c.1,000 wintering individuals in Korea (Brazil 2009).

Trend Justification:  The overall population trend is increasing, although some populations may be stable and others have unknown trends (Wetlands International 2006).
For further information about this species, see 22680024_tadorna_tadorna.pdf.
A PDF viewer such as Adobe Reader is required.
Current Population Trend: Increasing
Additional data:
Continuing decline of mature individuals: Unknown
Extreme fluctuations: No Population severely fragmented: No
Continuing decline in subpopulations: Unknown
Extreme fluctuations in subpopulations: No All individuals in one subpopulation: No

Habitat and Ecology [top]

Habitat and Ecology: Behaviour Most populations of this species are migratory (although European populations are largely sedentary) and undertake extensive moult migrations to favoured moulting sites after breeding (del Hoyo et al. 1992) (Asiatic breeding populations may also moult near their breeding grounds) (Kear 2005a). The species breeds in single pairs or small groups (Flint et al. 1984, del Hoyo et al. 1992), non-breeders usually remaining in flocks throughout the year (Kear 2005a). After breeding (between July and October) the species moults and becomes flightless for 25-31 days (Kear 2005a), during which it is highly gregarious (Madge and Burn 1988) and may aggregate into large flocks of up to 100,000 individuals or more (del Hoyo et al. 1992, Kear 2005a). Habitat The species shows a preference for saline habitats and frequents mudflats (del Hoyo et al. 1992) and muddy or sandy (Madge and Burn 1988) estuaries (Madge and Burn 1988, del Hoyo et al. 1992) in coastal regions, and occurs inland on saline and brackish lakes in steppe or semi-desert (Madge and Burn 1988). Asiatic populations also occupy freshwater rivers or marshes (Kear 2005a) and other populations utilise freshwater habitats on migration (Flint et al. 1984). Diet Its diet consists predominantly of salt-water molluscs (e.g. Hydrobia spp.) as well as other aquatic invertebrates (e.g. insects, crustaceans and worms), small fish, fish spawn and plant material (del Hoyo et al. 1992) (e.g. algae, seeds and agricultural grain) (Kear 2005a). Breeding site The nest is commonly positioned in a tree-hollow (del Hoyo et al. 1992) up to 8 m above the ground (Kear 2005a) or in a mammal burrow (e.g. of European rabbit Oryctolagus cuniculus) (del Hoyo et al. 1992, Kear 2005a). Rarely nests may also be placed in the open or in dense vegetation up to 1 km from water (Madge and Burn 1988, Kear 2005a). The species will also nest in artificial nest-boxes (Kear 2005a). Management information Studies in Danish coastal wetlands found that the spatial restriction of shore-based shooting was more successful at maintaining waterfowl population sizes than was the temporal restriction of shooting, and therefore that wildfowl reserves should incorporate shooting-free refuges that include adjacent marshland in order to ensure high waterfowl species diversity (Bregnballe et al. 2004). In the outer archipelago of south-west Finland experimental removal (extermination) of the nest predator American mink Neovison vison resulted in an increase in the breeding density of this species (Nordstrom et al. 2002).
Systems: Terrestrial; Freshwater; Marine
Continuing decline in area, extent and/or quality of habitat: Unknown
Generation Length (years): 10.9
Movement patterns: Full Migrant
Congregatory: Congregatory (and dispersive)

Threats [top]

Major Threat(s): The species is threatened by habitat loss as a result of tidal barrage schemes in Europe (Kear 2005a, Burton 2006). It also suffers predation from American mink Neovison vison on islands (Nordstrom et al. 2002) and is susceptible to avian influenza so may be threatened by future outbreaks of the virus (Melville and Shortridge 2006). Utilisation The species is hunted for commercial and recreational purposes in Iran (Balmaki and Barati 2006), and its eggs used to be (and possibly still are) harvested in Iceland (Gudmundsson 1979).

Citation: BirdLife International. 2012. Tadorna tadorna. The IUCN Red List of Threatened Species 2012: e.T22680024A40106812. . Downloaded on 07 October 2015.
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