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Distribution and Abundance of Predators that Affect
Duck Production: Prairie Pothole Region

Appendix

Table 4. Average percentage of quarter sections in which black-billed magpies and American crows were seen or heard during repeated counts along road transect on the 16-km center-road of stabilized regulations and Central Flyway study areas in the prairie pothole region during May to early July, 1983-85.

Areaa Years Number of
Counts		 Percentage of Quarter Sections
Black-billed Magpie American Crow
Canada
Alberta
Gayford 1985 12 1.9 14.8
Hay Lakes* 1983 14 3.2 9.5
1984 12 4.6 18.3
Holden* 1983 13 3.5 42.5
Penhold* 1984 12 11.9 21.5
1985 12 3.1 12.9
Manitoba
Cartwright 1983 15 2.7 10.0
Moore Park* 1983 13 1.5 14.4
1984 12 1.9 7.9
Saskatchewan
Ceylon 1983 12 0.0 2.7
1984 12 0.0 5.6
Craik 1984 12 1.3 21.7
1985 12 0.8 22.5
Denzil 1984 12 0.4 16.5
1985 12 0.6 17.9
Earl Grey* 1985 12 1.9 18.3
Goodwater 1983 14 0.2 5.4
Hanley* 1983 15 5.3 45.2
1984 12 4.8 40.4
1985 12 2.1 32.1
Inchkeith* 1984 9 3.3 9.7
1985 11 3.2 12.5
Leask* 1984 12 0.0 12.1
1985 12 0.2 9.6
Shamrock 1983 14 0.0 6.3
1984 12 0.0 7.7
1985 12 0.0 13.5
Yorkton* 1985 12 1.9 14.4
United States
Montana
Morgan 1983 7 0.0 0.0
Plentywood 1983 9 0.0 1.1
North Dakota
Plaza 1983 9 0.0 0.0
Sharon 1983 9 0.0 0.6
Streeter 1983 9 0.0 0.3
South Dakota
Hosmer 1983 6 0.0 0.8
Madison 1983 9 0.0 2.2
Parkston 1983 9 0.0 1.7

aStudy areas denoted with an asterisk (*) are in the aspen parkland, all others are in the prairie. No counts were made in the small unit management study areas.

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