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 |
|---|---|---|
| 2019 | 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) | 8,380,000 | medium |
| Extent of Occurrence non-breeding (km2) | 3,220,000 | medium |
| Number of locations | - | |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 80000-90000 | poor | estimated | 2011 |
| Population trend | Stable | inferred | - | |
| 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) | 8 | - | - | - |
Population justification: The population is estimated to number 120,000-130,000 individuals (Wetlands International 2018). This roughly equates to 80,000-90,000 mature individuals.
Trend justification: Data from the North American Breeding Bird Survey, combined for Aechmophorus occidentalis and A. clarkii, implies that the species has undergone a non-significant increase over the past three generations (24 years) (Sauer et al. 2017); whereas in Wetlands International (2018) the population trend is unknown. Given the uncertainty, and the fact that trend data is for these two species combined, the species is tentatively placed here as stable.
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Canada | N | Extant | Yes | Yes | ||
| Mexico | N | Extant | Yes | Yes | ||
| USA | N | Extant | Yes | Yes | Yes |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Aquatic & Marine | Artificial/Aquatic - Water Storage Areas (over 8ha) | suitable | breeding |
| Marine Coastal/Supratidal | Coastal Brackish/Saline Lagoons/Marine Lakes | suitable | breeding |
| Marine Neritic | Estuaries | suitable | non-breeding |
| Marine Neritic | Pelagic | suitable | non-breeding |
| Wetlands (inland) | Bogs, Marshes, Swamps, Fens, Peatlands | suitable | breeding |
| Wetlands (inland) | Permanent Freshwater Lakes (over 8ha) | major | breeding |
| Wetlands (inland) | Permanent Freshwater Lakes (over 8ha) | major | non-breeding |
| Wetlands (inland) | Permanent Saline, Brackish or Alkaline Marshes/Pools | suitable | non-breeding |
| Altitude | 0 - 2500 m | Occasional altitudinal limits |
Recommended citation
BirdLife International (2023) Species factsheet: Aechmophorus occidentalis. Downloaded from
http://www.birdlife.org on 27/03/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 27/03/2023.
