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Crow Indian Lake

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Grebe Survey Summary

  • Max Adults: 140
  • Year: 2007
  • Most Recent Adults: 4
  • Year: 2015
  • Survey Type: Shore; Boat; Air
  • Most Common Threats Reported: Water level too low
Lake name:
Crow Indian Lake
Location:
Alberta
Latitude:
49.3697222
Longitude:
-111.7841667
Basin type:
non-reservoir
Comments:
No other information on this lake.

Surveys (5)

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 100 100 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 Unpublished report for the Canadian Wildlife Service).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:
Prescott, D. R. C., J. Unruh, S. Morris-Yasinski, and M. Wells. 2018. Distribution and abundance of the western grebe (Aechmophorus occidentalis) in Alberta: an update. Alberta Environment and Sustainable Resource Development, Fish and Wildlife Policy Branch, Alberta Species at Risk Report No. 160, Edmonton, AB. 23 pp.

  • Type
    boat
  • Time period
    1992, 2015
  • Source
    Report
  • Both Western and Clarks?
    N
Count Type Range Max Year
Max Adults 1 to 100 100 2009
Most Recent Adults 1 to 100 4 2015
Max Nests 1 to 100 presence 2004, 2009, 2015
Most Recent Nests 1 to 100 presence 2015
Max Chicks 1 to 100 presence? 2004, 2009, 2015
Most Recent Chicks 1 to 100 presence? 2015

Comments:

Sources are eBird (accessed Nov 2015 and Dec 2016), AESRD and ACA (2013), FWMIS (Accessed Nov 2015 including field surveys from 2015 and 2016), Wollis and Stratmoen 2010, and Hanus 2002. This report is an update of Western grebe distribution in Alberta based on previous provincial status reports, additional breeding records (between May 1 to August 31) through end of 2014 from new sources. Lakes were visited in 2015 and 2016 for occupancy and habitat conditions. In a given year, if there are multiple sources of data, the highest count was given. From the Appendix, I entered only lakes (67) with evidence of breeding (either chicks or nests, but doesn't specify which and no nest nor chick numbers provided). Otherwise, 318 lakes supported adult grebe populations. This report compiled a list of 35 priority lakes for grebe surveys and management actions through the provincial recovery plan based on high population and habitat scores. New lakes with breeding reveal a changing system of lake occupancy and possibly higher populations than previously thought in Alberta.

Survey Citation:
Alberta Sustainable Resource Development and Alberta Conservation Association. 2013. Status of the western grebe (Aechmophorus occidentalis) in Alberta: Update 2012. Alberta Sustainable Resource Development. Alberta Wildlife Status Report No. 60 (Update 2012). Edmonston, AB. 48 pp.

  • Type
    boat
  • Time period
    2009
  • Source
    Report
  • Both Western and Clarks?
    N
Count Type Range Max Year
Max Adults 1 to 100 100 2009
Most Recent Adults 1 to 100 100 2009
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:

Data from Table 2 ("Most recent abundance estimates from known western grebe breeding lakes in Alberta based on structured surveys; at some lakes, more recent observations have been made but these were not complete counts"). Table 2 data is from Wollis and Stratmoen 2010. Estimates of western grebe numbers are a minimum estimate for that year derived from nest counts (x2 for breeding adult numbers) or boat surveys of adult grebes, using highest estimate. According to Table 4, the 2009 count is 1% of estimated proportion of provincial population. Water levels fluctuate due to being part of an irrigation system (H. Wollis, pers. comm.). This lake has a low amount of recreational activity.

Survey Citation:
Wollis, H., and C. Stratmoen. 2010. Population study of western grebes in Alberta 2001-2009: Implications for management and status designation. Alberta Sustainable Resource Development, Fish and Wildlife Division, Alberta Species at Risk Report No. 138. Edmonton, AB. 18 pp.

  • Time period
    2009
  • Source
    Report
  • Both Western and Clarks?
    N
Count Type Range Max Year
Max Adults 1 to 100 100 2009
Most Recent Adults 1 to 100 100 2009
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:

This report is a continuation of a western grebe monitoring project started in 2001 to survey colonies in Alberta and assess population trends and distribution. Known and new colonies were searched for each year through 2009. This entry is from Table 1 and Table 2 comparing most recent estimate of # adults with highest estimate year.

Survey Citation:
Environment and Climate Change Canada. 2021. Management Plan for the western grebe (Aechmophorus occidentalis) in Canada [Proposed]. Species at Risk Act Management Plan Series. Environment and Climate Change Canada, Ottawa. 5 iv + 52 pp.

  • Time period
    2007, 2015
  • Source
    Management plan
  • Both Western and Clarks?
    N
Count Type Range Max Year
Max Adults 101 to 500 140 2007
Most Recent Adults 1 to 100 4 2015
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 Appendix A, data columns are historical high count, high count since 2000, and most recent count. Since minimum count was not stated, I entered the minimum from these columns though it might not be the actual minimum across the span of years reported. Also, there is no detail on years that were excluded from surveying so range of survey years may be inaccurate. Footnote for this lake indicates that for 2015 to 2016, breeding was confirmed, potential habitat was available, and lake was occupied by Western grebes. Sources are Prescott et al., 2018 and Alberta Environment and Parks, 2018.

Sources of Information

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