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Browsing by Author "Andersen, David E. et al"

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    PRODUCTION OF EPP CANADA GEESE NEAR CAPE CHURCHILL IN 2002
    (2002) Andersen, David E. et al
    Nest searching for Eastern Prairie Population Canada geese was conducted on the Nestor One Study Area near Cape Churchill, Manitoba from 9-19 June 2002. A total of 42 nests was found in initial searches of 732 ha of wetlands in 14 primary sample areas, 55 nests were located in searches of 6 coastal sample areas, and 38 nests were located in 5 additional sample units north, south, and east of the primary units. Five additional nests were located subsequent to initial nest searching, resulting in a total of 140 nests. Nest density (unadjusted for observability) in the primary sample areas was 5.74 nests per 100 ha of wetland—comparable to nest density recorded on the Nestor One study area in the mid-1990s, but 29% lower than the nest density observed in 2001. Clutch size in 136 nests with eggs present when located averaged 3.63; lower than the long-term mean of 3.91 (1976-2002), but near the clutch size expected based on the established relationship between mean clutch size and median hatch date. Estimated median hatch date was 4 July, and ranged from 29 June to 10 July—the second latest estimated median hatch date in the period 1976 through 2002. Nesting success calculated as the average apparent success rate of nests active when first located during initial nest searching (0.36) and the 28-day survival of nests based on exposure days (0.78) was 0.57—similar to the average nesting success of 0.63 observed during the 1990s. Based on these estimates of nest density, clutch size, and nesting success, gosling production at Nestor One was approximately 11.9 per 100 ha of wetland—near the average of 16.5 goslings per 100 ha of wetlands observed in the 1990s. Thus, production at Nestor One in 2002 was near average levels observed in the 1990s, in spite of late phenology that resulted in late nesting by Canada geese on the study area.
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    PRODUCTION OF EPP CANADA GEESE NEAR CAPE CHURCHILL IN 2003
    (2003) Andersen, David E. et al
    Nest searching for Eastern Prairie Population Canada geese was conducted on the Nestor One Study Area near Cape Churchill, Manitoba from 4-11 June 2003. A total of 57 nests was found in initial searches of 732 ha of wetlands in 14 primary sample areas, 57 nests were located in searches of 6 coastal sample areas, and 44 nests were located in 3 additional sample units south and east of the primary units. Two nests were located subsequent to initial surveys or outside of surveyed sample areas, for a total of 160 nests located on the Nestor One study area in 2003. Nest density (unadjusted for observability) in the primary sample areas was 7.79 nests per 100 ha of wetland— near the highest nest density recorded on the Nestor One study site since the late 1980s, and 36% higher than that estimated in 2002. Clutch size in 143 nests with eggs present when located averaged 4.51—higher than the long-term mean of 3.93 (1976-2003) and the clutch size expected based on the established relationship between mean clutch size and median hatch date. Estimated median hatch date was 25 June, and ranged from 17 June to 1 July, with 77% of nests initiated on or before 23 May 2003 (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 (0.68) and the 28-day survival of nests based on exposure days through nest location (0.59) was 0.63—equal to the average 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 22.21 per 100 ha of wetland—above the average of 16.5 goslings per 100 ha of wetlands observed in the 1990s and estimated production of 11.9 goslings per 100 ha of wetland in 2002. Gosling production at Nestor One in 2003 was above the average observed in the 1990
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    PRODUCTION OF EPP CANADA GEESE NEAR CAPE CHURCHILL IN 2004
    (2004) Andersen, David E. et al
    Nest searching for Eastern Prairie Population Canada geese was conducted on the Nestor One Study Area near Cape Churchill, Manitoba from 16-21 June 2004. A total of 6 nests was found in initial searches of 732 ha of wetlands in 14 primary sample areas, 11 nests were located in searches of 6 coastal sample areas, and 7 nests were located in 3 additional sample units south and east of the primary units. A total of 24 nests was located on the Nestor One study area in 2004. Nest density (unadjusted for observability) in the primary sample areas was 0.82 nests per 100 ha of wetland— the lowest nest density recorded on the Nestor One study site from 1976-2004, and 89% lower than that estimated in 2003. Clutch size in 21 nests with eggs present when located averaged 2.19—lower than the long-term mean of 3.87 (1976-2004) and the clutch size expected based on the established relationship between mean clutch size and median hatch date. Estimated median hatch date was 11 July, and ranged from 7 to 15 July, with no nests initiated on or before 23 May 2004 (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 (0.15) and the 28-day survival of nests based on exposure days through nest location (0.33) was 0.24—considerably lower than the average 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 0.43 per 100 ha of wetland—the lowest productivity recorded from 1976-2004 and well below the average of 33.48 goslings per 100 ha of wetlands observed during that period.
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    PRODUCTION OF EPP CANADA GEESE NEAR CAPE CHURCHILL IN 2005
    (2005) Andersen, David E. et al
    Nest 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 2005
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    PRODUCTION OF EPP CANADA GEESE NEAR CAPE CHURCHILL IN 2006
    (2006) Andersen, David E. et al
    Nest searching for Eastern Prairie Population (EPP) Canada geese was conducted on the Nestor One Study Area near Cape Churchill, Manitoba from 25 May - 2 June 2006. A total of 70 Canada goose nests was found in initial searches of 732 ha of wetlands in 14 primary sample areas, 52 nests were located in initial searches of 6 coastal sample areas, and 45 nests were located during initial searches of 3 additional sample units south and east of primary units. Eleven nests were located subsequent to initial nest searches for a total of 178 nests located on the Nestor One study area in 2006. Nest density (unadjusted for observability) in the primary sample areas was 9.56 nests per 100 ha of wetland— the highest nest density recorded on the Nestor One study site since 1990, similar to that observed in 2005, and >10 times higher than that estimated in 2004, a year of record low nesting density. Clutch size in 158 nests with eggs present when located averaged 4.07—greater than the long-term mean of 3.87 (1976-2005) and near the clutch size expected based on the established relationship between mean clutch size and median hatch date. Estimated median hatch date was 17 June, and ranged from 9 - 23 June 2006, with 98.7% (n = 154) of nests initiated on or before 23 May 2006 (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 (0.76) and the 28-day survival of nests based on exposure days through nest location (0.72) was 0.74—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 28.01 per 100 ha of wetland—productivity similar to that observed in the early 2000s and mid-1990s, and slightly below the average of 33.40 goslings per 100 ha of wetlands observed during the period 1976-2005. In 2006, we conducted supplemental field investigations near the mouth of the Broad River as part of an ongoing research project, and data resulting from these efforts provide additional information about EPP Canada goose production.