LC
Clark's Grebe Aechmophorus clarkii



Taxonomy

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. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
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
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) 6,220,000 medium
Extent of Occurrence non-breeding (km2) 2,000,000 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 7300-14000 poor estimated 2009
Population trend Decreasing 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) 8 - - -

Population justification: The population is estimated to number 11,000-21,000 individuals, roughly equating to 7,300-14,000 mature individuals.

Trend justification: 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 Resident Breeding Non-breeding Passage
Canada N Extant Yes
Mexico N Extant
USA N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Canada Last Mountain Lake National Wildlife Area
Canada Valeport Marsh
Mexico Ciénega de Tláhuac
Mexico Cuitzeo
USA Bill Williams River National Wildlife Refuge
Mexico Complejo Lagunar Ojo de Liebre
Mexico Lago de Chapala
Mexico Subcuenca Tecocomulco
Mexico Complejo de Humedales del Noroeste de Chihuahua
Mexico Presa Laguna de Zumpango
Mexico Lago de Texcoco
Mexico Ciénegas del Lerma
Mexico Laguna de Bustillos
Mexico Santiaguillo

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

Recommended citation
BirdLife International (2023) Species factsheet: Aechmophorus clarkii. Downloaded from http://www.birdlife.org on 03/02/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 03/02/2023.