Population information

Order name Podicipediformes
Family name Podicipedidae
Scientific name Aechmophorus occidentalis Common name Western Grebe
Population name occidentalis
Breeding range Central W North America Non-breeding range S & Pacific USA to Baja California
Red List Category Least Concern
Ramsar regions North America
Notes

Conservation Framework

Conservation framework Notes
No conservation frameworks
Note:

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 1 0 0 100,000 1,000,000 [R8]
WPE 2 0 0 70,000 100,000 [R211]
WPE 3 0 0 120,000 120,001 [R344]
WPE 4 0 0 120,000 120,000 [S3200] [R344]
WPE 5 2001 2011 120,000 120,000 Census based [S7584] [R387] [R1274]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 1 1971 1981 DEC [R8]
WPE 2 1971 1981 DEC [R8]
WPE 3 1980 1990 DEC [R608]
WPE 4 1980 1990 DEC [R608]
WPE 5 1980 1990 DEC [T3956] [R608]

Population 1% level

Publication Yearset 1 percent Note
WPE 1 0 -1
WPE 2 1997 1200
WPE 3 2002 1200
WPE 4 2006 1200
WPE 5 2012 1200

References

  • R8 - American Ornithologists Union. (in press). Birds of North America. Philadelphia. The Academy of Natural Sciences, Washington DC.
  • R211 - Eichorst, B. (pers. comm.). 1995. Information supplied via the Wetlands International Grebe Specialist Group.
  • R344 - Jehl, J.R. jr. 2001. The abundance of the Eared (Black-necked) Grebe as a recent phenomenon. Waterbirds 24: 245-249.
  • R608 - Storer, R. W. and G. L. Nuechterlein. 1992. Western and Clark's Grebe in The Birds of North America, No. 26 (A. Poole, P. Stettenheim, and F. Gill, eds.). Academy Natural Sci., Philadelphia, and Amer. Ornith. Union, Washington, D.C.
  • R387 - Kushlan, James, A., Melanie J. Steinkamp, Katharine Parsons, Jack Capp, Martin Acosta Cruz, Malcolm Coulter, Ian Davidson, Loney Dickson, Naomi Edelson, Richard Elliot, R. Michael Erwin, Scott Hatch, Stephen Kress, Robert Milko, Steve Miller, Kyra Mills, Richard Paul, Roberto Phillips, Jorge E. Saliva, Bill Sydeman, John Trapp, Jennifer Wheeler, and Kent Wohl. 2002. North American Waterbird Conservation Plan, Version 1. Waterbird Conservation for the Americas, Washington, DC, USA.
  • R1274 - Environment Canada. 2012. Status of Birds in Canada 2011: http://www.ec.gc.ca/soc-sbc/index-eng.aspx?sY=2010andsL=e)

Notes

  • S3200 - 393 estimate breeding population of both subspecies combined at >110,000 adults (165,000 individuals).
  • S7584 - Kushlan et al. 2002 estimated breeding population of both subspecies combined at >110,000 adults (165,000 individuals). 10,000-25,000 of nominate form estimated for Canada (Environment Canada 2012); start yr based on Kushlan et al 2002; end year based on Canada estimate.
  • T3956 - No new data



Copyright Wetlands International 2012

Citation: Wetlands International (). "Waterbird Population Estimates" . Retrieved from wpe.wetlands.org on