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 |
|---|---|---|
| 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 23/11/2024.
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 23/11/2024.