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 | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 15,700,000 | |
| Extent of Occurrence non-breeding (km2) | 29,700,000 | |
| Number of locations | - | |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | poor | estimated | 2009 | |
| Population trend | Increasing | estimated | - | |
| 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) | 9.8 | - | - | - |
Population justification: The global population is estimated to number c.930,000-1,600,000 individuals (Wetlands International 2006), while national population sizes have been estimated at c.50-10,000 wintering individuals in Japan and c.100-10,000 breeding pairs c.1,000-10,000 wintering individuals in Russia (Brazil 2009).
Trend justification: This species has undergone a large and statistically significant increase over the last 40 years in North America (148% increase over 40 years, equating to a 25.5% increase per decade; data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Bermuda (to UK) | V | Extant | Yes | |||
| Canada | N | Extant | Yes | Yes | ||
| China (mainland) | V | Extant | ||||
| Greenland (to Denmark) | V | Extant | ||||
| Hong Kong (China) | V | Extant | ||||
| Japan | N | Extant | ||||
| Mexico | N | Extant | ||||
| North Korea | U | Extant | ||||
| Russia | N | Extant | Yes | |||
| Russia (Asian) | N | Extant | Yes | |||
| South Korea | U | Extant | ||||
| USA | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| Russia (Asian) | Kuril islands (between Urup and Paramushir) |
| Russia (Asian) | West Chaun plain |
| Canada | Active Pass |
| Canada | Cowichan estuary |
| Canada | Baynes Sound |
| Canada | Lawn Point |
| Canada | Churchill and Vicinity |
| Canada | Seal River Estuary |
| Canada | Rasmussen Lowlands |
| Canada | Babbage and Spring River Deltas |
| Canada | Blow River Delta (Shingle Point to Tent Island) |
| Canada | Little Qualicum Estuary to Nanoose Bay |
| Canada | McIntyre Beach and Rose Spit |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Marine Neritic | Estuaries | suitable | non-breeding |
| Marine Neritic | Macroalgal/Kelp | major | non-breeding |
| Marine Neritic | Pelagic | major | non-breeding |
| Marine Neritic | Pelagic | major | breeding |
| Marine Neritic | Seagrass (Submerged) | major | non-breeding |
| Marine Neritic | Subtidal Loose Rock/pebble/gravel | major | non-breeding |
| Marine Neritic | Subtidal Rock and Rocky Reefs | major | non-breeding |
| Marine Neritic | Subtidal Sandy | major | non-breeding |
| Marine Neritic | Subtidal Sandy-Mud | major | non-breeding |
| Wetlands (inland) | Permanent Freshwater Lakes (over 8ha) | major | breeding |
| Altitude | 0 - 500 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Pollution | Industrial & military effluents - Oil spills | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Negligible declines | Low Impact: 4 | ||||||
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Recommended citation
BirdLife International (2022) Species factsheet: Gavia pacifica. Downloaded from
http://www.birdlife.org on 22/05/2022.
Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 22/05/2022.
