Seven Persons Lake

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
  1991, 2011
• Source
  Report
• Both Western and Clarks?
  N

Count Type	Range	Max	Year
Max Adults	1 to 100	2	1991-2011
Most Recent Adults	1 to 100	?	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 from 1991 to 2011 (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 Unpublished report for the Canadian Wildlife Service). No break out of data per year 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
  12 June 2008
• Source
  Dissertation
• Both Western and Clarks?
  N

Count Type	Range	Max	Year
Max Adults	1 to 100	2	2008
Most Recent Adults	1 to 100	2	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 method and date for 2008 field season, and latest abundance estimate from 2008, which is the same as maximum abundance estimate. Source of maximum abundance estimate is from the 2008 field data.