Data Zone
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. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2020 | Least Concern | |
| 2018 | Least Concern | |
| 2016 | Least Concern | |
| 2012 | Least Concern | |
| 2009 | Least Concern | |
| 2008 | Least Concern | |
| 2004 | Least Concern | |
| 2000 | Lower Risk/Least Concern | |
| 1994 | Lower Risk/Least Concern | |
| 1988 | Lower Risk/Least Concern |
| Migratory status | not a migrant | Forest dependency | Does not normally occur in forest |
| Land mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 3,600,000 | |
| Extent of Occurrence non-breeding (km2) | 5,460,000 | |
| Number of locations | - | |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 67000 | poor | estimated | 2015 |
| Population trend | Decreasing | suspected | - | |
| Decline (3 years/1 generation past) | - | - | - | |
| Decline (5 years/1 generation past) | - | - | - | |
| Decline (10 years/1 generation past) | - | - | - | |
| Decline (10 years/3 generation future) | - | - | - | |
| Decline (10 years/3 generation past and future) | - | - | - | |
| Number of subpopulations | - | - | - | |
| Percentage in largest subpopulation | - | - | - | |
| Generation length (yrs) | 7.3 | - | - | - |
Population justification: The global population is estimated to number more than 100,000 individuals, which equates to more than 67,000 mature individuals (del Hoyo et al. 1996).
Trend justification: The population is suspected to be in decline owing to predation by invasive species and ongoing habitat destruction.
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Japan | N | Extant | Yes | |||
| Russia | N | Extant | Yes | Yes | ||
| Russia (Asian) | N | Extant | Yes | Yes | ||
| USA | N | Extant | Yes | Yes |
| Country/Territory | IBA Name |
|---|---|
| Russia (Asian) | Kuril islands (between Urup and Paramushir) |
| Russia (Asian) | Iony Island |
| USA | Buldir Island |
| USA | Unimak Pass, marine |
| Russia (Asian) | Kuril islands (between Urup and Paramushir) - Marine |
| Russia (Asian) | Iony island - Marine |
| USA | Amchitka Pass 180W51N |
| USA | Amlia Island |
| USA | Bering Sea Shelf Edge 166W55N |
| USA | Buldir & Near Islands Marine |
| USA | Fenimore Pass & Atka Island Marine |
| USA | Gareloi Island Marine |
| USA | Kagamil Island Marine |
| USA | Kiska Island Marine |
| USA | Seguam Island Marine |
| USA | Unimak & Akutan Passes |
| USA | Buldir Island Colony |
| Russia (Asian) | Commander Islands |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Marine Coastal/Supratidal | Sea Cliffs and Rocky Offshore Islands | major | breeding |
| Marine Intertidal | Rocky Shoreline | major | breeding |
| Marine Intertidal | Tidepools | major | breeding |
| Marine Neritic | Macroalgal/Kelp | major | resident |
| Marine Neritic | Pelagic | major | resident |
| Marine Neritic | Seagrass (Submerged) | major | resident |
| Marine Neritic | Subtidal Loose Rock/pebble/gravel | major | resident |
| Marine Neritic | Subtidal Rock and Rocky Reefs | major | resident |
| Marine Neritic | Subtidal Sandy | major | resident |
| Marine Neritic | Subtidal Sandy-Mud | major | resident |
| Marine Oceanic | Epipelagic (0-200m) | suitable | resident |
| Marine Oceanic | Mesopelagic (200-1000m) | suitable | resident |
| Altitude | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Climate change & severe weather | Habitat shifting & alteration | Timing | Scope | Severity | Impact | ||||
| Ongoing | Whole (>90%) | Unknown | Unknown | ||||||
|
|||||||||
| Climate change & severe weather | Storms & flooding | Timing | Scope | Severity | Impact | ||||
| Ongoing | Whole (>90%) | Unknown | Unknown | ||||||
|
|||||||||
| Purpose | Primary form used | Life stage used | Source | Scale | Level | Timing |
|---|---|---|---|---|---|---|
| Pets/display animals, horticulture | - | - | International | Non-trivial | Recent |
Recommended citation
BirdLife International (2022) Species factsheet: Aethia pygmaea. Downloaded from
http://www.birdlife.org on 30/06/2022.
Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 30/06/2022.
