Northern Prairie Wildlife Research Center
Annual precipitation and temperature statistics were obtained from recording stations nearest to our study areas (Table 5) (Atmos. Environ. Serv., Cent. Reg., Environ. Canada, Winnipeg, Manit. or Atmos. Environ. Serv., West. Reg., Environ. Canada, Edmonton, Alta., unpubl. data). Field crews reported local weather conditions on individual study areas, especially storms with potential to adversely affect nesting.
|Study area||Reporting station||30-year average (cm)||Departure (%)|
amounts obtained from Atmos. Environ. Serv., East. Reg., Environ. Canada,
bDundurn station closed in 1985; average and monthly amount in 1985 are for Colonsay.
cAverage and monthly amounts obtained from Atmos. Environ. Serv., West. Reg., Environ. Canada, Edmonton, Alta.
Wetland conditions in early May 1983 were similar to 1982. Two storms during 8-14 May produced rain and snow on Shamrock, Hanley, Goodwater, Ceylon, Moore Park, and Cartwright study areas. However, total precipitation during the nesting season was below average on 5 of those areas (Table 5). Higher than average precipitation on Hay Lakes and Holden study areas that year resulted from 20.0 cm of rain during 18-30 June; low-lying areas flooded and depth of water in many wetlands increased up to 90.0 cm on those study areas.
Drought impacted 6 of 10 areas studied in 1984. An average of 12% of temporary, 24% of seasonal, and 71% of semipermanent wetlands overall were wet in May (Table 4). Precipitation during the nesting season was 13-52% below average on areas studied that year (Table 5). Only Denzil and Leask study areas had precipitation well above average (22 and 66%).
Ample wet wetlands were available in May 1985 on Craik, Earl Grey, Hanley, Inchkeith, and Leask study areas (Table 4). Precipitation during the nesting season on the 10 areas studied in 1985 was below average on 5 and near or above average on the remaining (Table 5).