Creston Valley WMA (CVWMA)

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

• Time period
  1970, 2011
• Source
  Report
• Both Western and Clarks?
  N

Count Type	Range	Max	Year
Max Adults	101 to 500	141	1991-2011
Most Recent Adults	1 to 100	?	2011
Max Nests	1 to 100	90	1991-2011
Most Recent Nests	1 to 100	90	1991-2011
Max Chicks	N/A	N/A	N/A
Most Recent Chicks	N/A	N/A	N/A

Comments:

No specific lake named but most likely Duck Lake. From Table A.1, maximum counts of Western grebes (which may include non-breeding adults) at breeding lakes in B.C. from June to August (Burger 1997, Anderson et al. 2011). Stated as 20 year chunks: 1970 - 1990 and 1991 - 2011 without breaking those down into years or other details. No adult count number in 1970 - 1990 column but 90 nests reported then. From 1997 to 2008, surveys not systematic but 21 to 41 nests per year counted (Anderson et al. 2011).

Survey Citation:
Beaucher, M.-A. 2022. Creston Valley Wildlife Management Area, email communication.

• Time period
  N/A
• Source
  Personal communication
• Both Western and Clarks?
  N/A

Count Type	Range	Max	Year
Max Adults	N/A	N/A	N/A
Most Recent Adults	N/A	N/A	N/A
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:

Marc-Andre Beaucher, Head of Conservation Programs at Creston Valley WMA detailed some of the threats to nesting grebes in the CVWMA in general. Some things unknown are the impacts of water levels and fish populations since there are a lot of exotic fish in the valley. See Creston Valley Wildlife Management Area (2023) entry for the grebe data

Survey Citation:
Creston Valley Wildlife Management Area. 2023. Unpublished datta.

• Type
  shore
• Time period
  1991, 1995
• Source
  Database
• Both Western and Clarks?
  N

Count Type	Range	Max	Year
Max Adults	1 to 100	40-60	1995
Most Recent Adults	1 to 100	40-60	1995
Max Nests	1 to 100	20-30	1995
Most Recent Nests	1 to 100	20-30	1995
Max Chicks	1 to 100	1-3	1991
Most Recent Chicks	1 to 100	1-3	1991

Comments:

Database forwarded from Marc-Andre Beaucher, Head of Conservation Programs, Creston Valley Wildlife Management Area (CVWMA) includes Western grebe survey data from 1968 to 2022 of Duck Lake, Kootenay Lake, Leach Lake and CVWMA in general. Surveys from 1968 through 2003 are limited in survey data and are once or twice during the breeding season. Surveys from 2004 through 2022 have more details and are more frequent throughout the breeding season, ranging from once to weekly or almost regularly depending on the year. Some surveys extended beyond the breeding range so data culled for this inventory is restricted to approximately mid-May through August. Survey comments often stated that nests and chicks were not mentioned unless there were count numbers for those. If surveys were conducted mid to late breeding season, I assumed nests and chicks were surveyed for but not found if those columns were zero. Conversely, zero for an adult count number at a lake did not necessarily signify zero adults were found. Refer to time surveyed per lake in a given year to see if that lake was surveyed at all, or in the survey dates of that year. Maximum count numbers for that breeding season for that lake was used for this summary.