Andersen, David E. et al2017-01-192017-01-192005https://hdl.handle.net/11299/183524Nest searching for Eastern Prairie Population (EPP) Canada geese was conducted on the Nestor One Study Area near Cape Churchill, Manitoba from 3-12 June 2005. A total of 69 Canada goose nests was found in initial searches of 732 ha of wetlands in 14 primary sample areas, 59 nests were located in initial searches of 6 coastal sample areas, and 44 nests were located during initial searches of 3 additional sample units south and east of primary units. nests were located subsequent to initial nest searches for a total of 182 nests located on the Nestor One study area in 2005. Nest density (unadjusted for observability) in the primary sample areas was 9.43 nests per 100 ha of wetland— the highest nest density recorded on the Nestor One study site since 1990, and >10 times higher than that estimated in 2004, a year of record low nesting density. Clutch size in 154 nests with eggs present when located averaged 3.79—slightly lower than the long-term mean of 3.87 (1976-2004) and near the clutch size expected based on the established relationship between mean clutch size and median hatch date. Estimated median hatch date was 28 June, and ranged from 20 June to 3 July 2005, with 23.8% (n = 151) of nests initiated on or before 23 May 2005 (the date used to define “bust” production). Nest success calculated as the average apparent success rate of nests active when first located during initial nest searching (0.81) and the 28-day survival of nests based on exposure days through nest location (0.51) was 0.66—slightly higher than the average estimated nest success of 0.63 observed during the 1990s. Based on these estimates of nest density, clutch size, and nest success, gosling production at Nestor One was approximately 22.95 per 100 ha of wetland—productivity similar to that observed in the early 2000s and mid-1990s, and slightly below the average of 33.48 goslings per 100 ha of wetlands observed during the period 1976-2004. Supplemental field investigations near the town of Churchill and the mouth of the Broad River were conducted and provided additional information about EPP Canada goose production in 2005enReport