Big Lake
Grebe Survey Summary
- Max Adults: 3
- Year: 1982
- Most Recent Adults: 0
- Year: 2011
- Survey Type: Shore; Boat; Air
- Most Common Threats Reported: N/A
- Lake name:
- Big Lake
- Location:
- Alberta
- Latitude:
- 53.594926
- Longitude:
- -113.718828
- Surface area (km2):
- 29.88
- Basin type:
- non-reservoir
- Management agency:
- Alberta Fish and Wildlife; Alberta Parks; City of St. Albert
- Region associations:
- Lois Hole Centennial Provincial Park; Sturgeon River
- Designations:
- Park
- Comments:
- Recognized as one of the 20 most important waterfowl habitat units in Alberta. It is very shallow.
Surveys (2)
Survey Citation:
COSEWIC. 2014. COSEWIC assessment and status report on the western grebe (Aechmophorus occidentalis) in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. 55 pp. www.registrelep-sararegistry.gc.ca/default_e.cfm
-
Type
shore; boat; air -
Time period
1970, 2011 -
Source
Report -
Both Western and Clarks?
N
| Count Type | Range | Max | Year |
|---|---|---|---|
| Max Adults | 1 to 100 | 3 | 1970-1990 |
| Most Recent Adults | 0 | 0 | 2011 |
| Max Nests | N/A | N/A | N/A |
| Most Recent Nests | N/A | N/A | N/A |
| Max Chicks | N/A | N/A | N/A |
| Most Recent Chicks | N/A | N/A | N/A |
Comments:
From Table A.2, maximum counts of breeding Western grebes from surveys mostly conducted during nesting season from June and July (sourced from Wilson, A. and Smith, P.A. 2013. Distribution and population status of Western Grebes in Canada. Unpublished report for the Canadian Wildlife Service). Stated as 20 year chunks: 1970 - 1990 and 1991 - 2011 without breaking those down into years or other details.
Survey Citation:
Erickson, M. E. 2010. Persistence and abundance of the western grebe in Alberta. Dissertation. University of Alberta. Edmonton, Alberta, Canada. Same lakes and abundance estimated were checked against Erickson, M. E., C. Found-Jackson, and M. S. Boyce. 2017. Habitat associations with counts of declining western grebes in Alberta, Canada. Avian Conservation and Ecology. 12(1):12. Appendix to Erickson et al 2014 is unavailable but presumed to be the same list of lakes and abundance estimates.
-
Type
shore -
Time period
24 May 2008, 9 August 2008 -
Source
Dissertation -
Both Western and Clarks?
N
| Count Type | Range | Max | Year |
|---|---|---|---|
| Max Adults | 1 to 100 | 3 | 1982 |
| Most Recent Adults | 0 | 0 | 2008 |
| Max Nests | N/A | N/A | N/A |
| Most Recent Nests | N/A | N/A | N/A |
| Max Chicks | N/A | N/A | N/A |
| Most Recent Chicks | N/A | N/A | N/A |
Comments:
From Table B.1 and Table C.1, survey methods and dates for 2008 field season, and latest abundance estimate from 2008, compared to maximum abundance estimate. Source of maximum abundance estimate is historical data from Wildlife Status Reports (WSR) #60. I didn't include maximum abundance estimate as part of the survey date for Erickson's surveys.