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LC
Western Grebe Aechmophorus occidentalis

IUCN Red List history

Year Category
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

Species attributes

Migratory status full migrant Forest dependency Does not normally occur in forest
Land mass type   Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 1,030,000 medium
Extent of Occurrence non-breeding (km2) 1,030,000 medium
Number of locations -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals poor Estimated 2009
Population trend Decreasing -
Number of subpopulations - - -
Largest subpopulation - - -
Generation length (yrs) 8 - - -
Population justification: The population is estimated to number 130,000 individuals.
Trend justification: The overall population trend is decreasing, although some populations have unknown trends (Wetlands International 2006). This species has undergone a small or statistically insignificant decrease over the last 40 years in North America (data for Aechmophorus occidentalis and A. clarkii combined, from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Canada Native Extant     Yes Yes
Mexico Native Extant        
USA Native Extant Yes      

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Canada Barkley Sound site factsheet
Canada Baynes Sound site factsheet
Canada Boundary Bay - Roberts Bank - Sturgeon Bank (Fraser River Estuary) site factsheet
Canada Delta Marsh site factsheet
Canada Eagle, Namaka and Stobart Lakes site factsheet
Canada English Bay and Burrard Inlet site factsheet
Canada Frank Lake (south) site factsheet
Canada Lesser Slave Lake PP site factsheet
Canada Little Qualicum Estuary to Nanoose Bay site factsheet
USA Bear River Bay UT02 site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Wetlands (inland) Permanent Freshwater Lakes (over 8ha) major breeding
Wetlands (inland) Permanent Freshwater Lakes (over 8ha) major non-breeding
Altitude 750 - 2500 m Occasional altitudinal limits  

Recommended citation
BirdLife International (2014) Species factsheet: Aechmophorus occidentalis. Downloaded from http://www.birdlife.org on 23/08/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 23/08/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Podicipedidae (Grebes)
Species name author (Lawrence, 1858)
Population size mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 1,030,000 km2
Country endemic? No
Links to further information
- Summary information on this species