Stercorarius pomarinus 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Charadriiformes Stercorariidae

Scientific Name: Stercorarius pomarinus
Species Authority: (Temminck, 1815)
Regional Assessments:
Common Name(s):
English Pomarine Jaeger, Pomarine Skua
French Labbe pomarin
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): Calvert, R., Butchart, S., Ekstrom, J.
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 stable, 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]

Range Description: The Pomarine Jaeger breeds in the far north of Eurasia and North America. It is a transequatorial migrant, mostly wintering between the Tropic of Cancer and Tropic of Capricorn and along the coastlines of Australia and Argentina1.
Countries occurrence:
Algeria; Angola (Angola); Antigua and Barbuda; Argentina; Aruba; Australia; Austria; Azerbaijan; Bahamas; Bahrain; Barbados; Belgium; Belize; Bermuda; Bonaire, Sint Eustatius and Saba (Saba, Sint Eustatius); Brazil; British Indian Ocean Territory; Brunei Darussalam; Bulgaria; Canada; Cape Verde; Chile; China; Colombia; Costa Rica; Côte d'Ivoire; Cuba; Curaçao; Czech Republic; Denmark; Djibouti; Dominica; Ecuador; Egypt; Eritrea; Faroe Islands; Finland; France; French Guiana; Gambia; Germany; Ghana; Gibraltar; Greenland; Guadeloupe; Guatemala; Guyana; Hungary; Iceland; India; Indonesia; Iran, Islamic Republic of; Ireland; Israel; Italy; Japan; Kenya; Kiribati; Kuwait; Lebanon; Liberia; Malaysia; Maldives; Malta; Marshall Islands; Martinique; Mauritania; Mexico; Montserrat; Morocco; Myanmar; Namibia; Netherlands; New Caledonia; Nicaragua; Nigeria; Northern Mariana Islands; Norway; Oman; Pakistan; Palestinian Territory, Occupied; Panama; Peru; Philippines; Poland; Portugal; Puerto Rico; Qatar; Romania; Russian Federation; Saint Kitts and Nevis; Saint Lucia; Saint Martin (French part); Saint Pierre and Miquelon; Saint Vincent and the Grenadines; Saudi Arabia; Senegal; Sierra Leone; Sint Maarten (Dutch part); Slovakia; Solomon Islands; South Africa; Spain; Sri Lanka; Suriname; Sweden; Switzerland; Thailand; Trinidad and Tobago; Tunisia; Turkmenistan; Turks and Caicos Islands; United Arab Emirates; United Kingdom; United States; Uruguay; Vanuatu; Venezuela, Bolivarian Republic of; Virgin Islands, British; Virgin Islands, U.S.; Western Sahara; Yemen
Antarctica; Belarus; Bosnia and Herzegovina; Congo; Croatia; Fiji; Greece; Guinea-Bissau; Haiti; Hong Kong; Jordan; Kazakhstan; Korea, Republic of; Latvia; Luxembourg; Montenegro; New Zealand; Saint Helena, Ascension and Tristan da Cunha; Serbia (Serbia); Slovenia; Somalia; Tanzania, United Republic of; Togo; Turkey
Present - origin uncertain:
Anguilla; Benin; Cambodia; Cayman Islands; Christmas Island; Comoros; Dominican Republic; El Salvador; Equatorial Guinea; French Southern Territories; Grenada; Guinea; Honduras; Jamaica; Madagascar; Micronesia, Federated States of ; Mozambique; Norfolk Island; Palau; Papua New Guinea; Sao Tomé and Principe; Seychelles; Sudan; Taiwan, Province of China; Timor-Leste; Tuvalu; Viet Nam; Wallis and Futuna
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 3050000
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
Upper elevation limit (metres): 300
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: In Europe, the breeding population is estimated to number c.20,000-50,000 breeding pairs, equating to c.60,000-150,000 individuals (BirdLife International 2004). Europe forms 5-24% of the global range, so a very preliminary estimate of the global population size is c.250,000-3,000,000 individuals, although further validation of this estimate is needed. National population estimates include: < c.1,000 individuals on migration in Taiwan; c.50-1,000 individuals on migration and c.50-1,000 wintering individuals in Korea; c.50-10,000 wintering individuals in Japan and c.100-100,000 breeding pairs and c.50-10,000 individuals on migration in Russia (Brazil 2009).

Trend Justification:  The population is suspected to be stable in the absence of evidence for any declines or substantial threats.
Current Population Trend: Stable
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: This species is marine outside the breeding season, remaining somewhat coastal, especially in upwelling regions of the tropics and subtropics. Whilst breeding it specialises on catching lemmings which frequently constitute over 90% of their diet, also feeding on young waders and gamebirds, bird eggs, carrion. In winter it takes fish, sometimes by kleptoparasitism, small seabirds, and scavenges on carrion. Breeding begins in June at scattered sites across the tundra where lemming concentrations are high. Individuals are highly territorial. Outside the breeding season it migrates south including long migrations over land (del Hoyo et al. 1996).
Systems: Terrestrial; Freshwater; Marine
Continuing decline in area, extent and/or quality of habitat: Unknown
Generation Length (years): 13.5
Movement patterns: Full Migrant
Congregatory: Congregatory (and dispersive)

Citation: BirdLife International. 2012. Stercorarius pomarinus. The IUCN Red List of Threatened Species 2012: e.T22694240A38876227. . Downloaded on 27 November 2015.
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