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Anser caerulescens 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Anseriformes Anatidae

Scientific Name: Anser caerulescens
Species Authority: (Linnaeus, 1758)
Regional Assessments:
Common Name(s):
English Snow Goose
Synonym(s):
Anser caerulescens caerulescens Stotz et al. (1996)
Anser caerulescens caerulescens Sibley and Monroe (1990, 1993)
Anser caerulescens caerulescens Cramp and Simmons (1977-1994)
Chen caerulescens (Linnaeus, 1758)
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, Barcelona, Spain and Cambridge, UK.
Taxonomic Notes: Anser caerulescens (del Hoyo and Collar 2014) was previously placed in the genus Chen.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Ashpole, J, Butchart, S., Ekstrom, J.
Justification:
This species has a very 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 extremely 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:

Geographic Range [top]

Countries occurrence:
Native:
Canada; China; Greenland; India; Japan; Korea, Republic of; Mexico; Russian Federation; United States
Vagrant:
Anguilla; Bahamas; Barbados; Belgium; Belize; Bermuda; Bulgaria; Cuba; Czech Republic; Denmark; Estonia; Faroe Islands; Finland; France; Germany; Honduras; Iceland; Ireland; Italy; Kazakhstan; Korea, Democratic People's Republic of; Latvia; Lithuania; Marshall Islands; Netherlands; Norway; Poland; Portugal; Puerto Rico; Romania; Saint Pierre and Miquelon; Spain; Trinidad and Tobago; Turks and Caicos Islands; United Kingdom; Virgin Islands, U.S.
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:9720000
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Upper elevation limit (metres):2500
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The global population is estimated at 5,300,000-6,200,000 individuals (Wetlands International 2015). The European population is estimated at 1,000-2,000 pairs, which equates to 2,000-4,000 mature individuals (BirdLife International 2015).

Trend Justification:  The overall population trend is increasing (Wetlands International 2015). This species has undergone a large and statistically significant increase over the last 40 years in North America (4400% increase over 40 years, equating to a 159% increase per decade; data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007). In Europe the population size is estimated to be increasing (BirdLife International 2015).
Current Population Trend:Increasing
Additional data:
Continuing decline of mature individuals:Unknown
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:The following information refers to the species's range in Europe only. The species is found on low, grassy tundra, generally in close association with water (ponds, shallow lakes or river deltas) or on stony ground. Breeding begins in June usually as soon as areas become free of snow and generally within 7-10 days of arrival on nesting grounds. It is monogamous, often for life, although extra-pair copulations have been recorded. The nest is built by the female, who chooses the site as well and is a shallow depression filled with moss and lined with grass and down on the ground. Normally five or six eggs are laid. The diet is principally vegetarian, comprising of roots, tubers, leaves, grasses, stems and seed heads of various aquatic plants and sedges. The species is migratory (Carboneras et al. 2014).
Systems:Terrestrial; Freshwater; Marine
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):8.9
Movement patterns:Full Migrant
Congregatory:Congregatory (and dispersive)

Threats [top]

Major Threat(s): The following information refers to the species's range in Europe only. Despite hunting pressure this species is increasing in numbers (Kear 2005). Climatic effects may impact the species in the future (Murphy-Klassen et al. 2005).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
CMS Appendix II. There are no known conservation measures currently in place for this species within Europe.

Conservation Actions Proposed
No conservation measures are currently needed for this species within Europe.

Citation: BirdLife International. 2016. Anser caerulescens. The IUCN Red List of Threatened Species 2016: e.T22679896A85973888. . Downloaded on 10 December 2016.
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