Clark's Grebe (Aechmophorus clarkii) - BirdLife species factsheet

Clark's Grebe Aechmophorus clarkii

Current view: Data table and detailed info

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	-

Extent of occurrence (EOO)

	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		-
Fragmentation		-

Population and trend

	Estimate	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		-	-	-
Largest subpopulations		-	-	-
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	Breeding
Canada	N	Extant	Yes
Mexico	N	Extant
USA	N	Extant	Yes

Important Bird and Biodiversity Areas (IBA)

Country/Territory	IBA Name
USA	Bill Williams River National Wildlife Refuge

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 (2019) Species factsheet: Aechmophorus clarkii. Downloaded from http://www.birdlife.org on 22/01/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/01/2019.