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 |
---|---|---|
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 | full migrant | Forest dependency | does not normally occur in forest |
Land-mass type | Average mass | 1,323 g |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence (breeding/resident) | 5,080,000 km2 | |
Extent of Occurrence (non-breeding) | 9,050,000 km2 | |
Severely fragmented? | no | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | unknown | poor | estimated | 2006 |
Population trend | unknown | - | - | - |
Generation length | 11.5 years | - | - | - |
Population justification: The global population is estimated to number c.25,000-1,000,000 individuals (Delany and Scott 2006).
Trend justification: The population trend is difficult to determine because of uncertainty over the extent of threats to the species (del Hoyo et al. 1996).
Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Canada | extant | native | ||||
China (mainland) | extant | native | yes | |||
Guam (to USA) | extant | vagrant | ||||
Japan | extant | native | yes | yes | ||
North Korea | extant | native | yes | |||
Russia | extant | native | yes | |||
Russia (Asian) | extant | native | yes | |||
South Korea | extant | native | yes | |||
Taiwan, China | extant | native | yes | |||
USA | extant | native | yes |
Country/Territory | IBA Name |
---|---|
Japan | Daikoku islet |
Japan | Eastern Hokkaido - Marine |
Japan | Shiretoko, Mount Syari-dake |
Japan | Teuri island |
Japan | Tomoshiri and Chitomoshiri islets |
Japan | Yururi and Moyururi islets |
Russia (Asian) | Avachinskaya Bay and Starichkov Island |
Russia (Asian) | Bogoslova Island |
Russia (Asian) | Bol'shaya River Estuary |
Russia (Asian) | Cape Oria |
Russia (Asian) | Karaginskiy Island |
Russia (Asian) | Khalpili Islands and Impoveyem Bay |
Russia (Asian) | Kuril islands (between Urup and Paramushir) |
Russia (Asian) | Moroshechnaya River |
Russia (Asian) | Nerpich'ye Lake and Kamchatka River delta |
Russia (Asian) | Signal'nyy Island |
Russia (Asian) | Tyuleniy Island |
Russia (Asian) | Utashud Island |
Russia (Asian) | Utkholok river |
Russia (Asian) | Verkhoturova Island |
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Marine Coastal/Supratidal | Sea Cliffs and Rocky Offshore Islands | major | breeding |
Marine Intertidal | Sandy Shoreline and/or Beaches, Sand Bars, Spits, Etc | major | breeding |
Marine Neritic | Macroalgal/Kelp | suitable | non-breeding |
Marine Neritic | Macroalgal/Kelp | suitable | breeding |
Marine Neritic | Pelagic | major | non-breeding |
Marine Neritic | Pelagic | major | breeding |
Marine Neritic | Seagrass (Submerged) | suitable | non-breeding |
Marine Neritic | Seagrass (Submerged) | suitable | breeding |
Marine Neritic | Subtidal Loose Rock/pebble/gravel | suitable | non-breeding |
Marine Neritic | Subtidal Loose Rock/pebble/gravel | suitable | breeding |
Marine Neritic | Subtidal Rock and Rocky Reefs | suitable | non-breeding |
Marine Neritic | Subtidal Rock and Rocky Reefs | suitable | breeding |
Marine Neritic | Subtidal Sandy | suitable | non-breeding |
Marine Neritic | Subtidal Sandy | suitable | breeding |
Marine Neritic | Subtidal Sandy-Mud | suitable | non-breeding |
Marine Neritic | Subtidal Sandy-Mud | suitable | breeding |
Rocky areas (eg. inland cliffs, mountain peaks) | suitable | breeding | |
Altitude | Occasional altitudinal limits |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Climate change & severe weather | Habitat shifting & alteration | Timing | Scope | Severity | Impact | ||||
Future | Whole (>90%) | Unknown | Unknown | ||||||
|
Purpose | Scale |
---|---|
Pets/display animals, horticulture | international |
Recommended citation
BirdLife International (2024) Species factsheet: Slaty-backed Gull Larus schistisagus. Downloaded from
https://datazone.birdlife.org/species/factsheet/slaty-backed-gull-larus-schistisagus on 23/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 23/12/2024.