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

Appendix


Table 15. Number and density (nest/km2) of occupied raptor nests in study areas in the prairie pothole region, 1983-88.

Areaa Year Searched Quarter Sections Species
Northern Harrier Swainson's Hawk Red-tailed Hawk Ferruginous Hawk Great Horned Owl
N Nest/ km2 N Nest/
km2
N Nest/
km2

N
Nest/
km2
N Nest/
km2
Canada
Alberta
Gayford 1985 40 (1)b (0.04) 4 0.15 3 0.12 0   0  
Hay Lakes* 1983 - (4) (0.15) (0)   (11) (0.42) 0   (2) (0.08)
1984 40 (0)   3 0.12 19 0.73 (0)   1 0.04
Holden* 1983 - (4) (0.15) (0)   (4) (0.15) 0   (2) (0.08)
Penhold* 1984 40 (1) (0.04) 1 0.04 7 0.27 (0)   0  
1985 35 (0)   0   2 0.09 0   0  
Manitoba
Cartwright 1983 - (1) (0.04) (0)   (1) (0.04) (0)   0  
Moore Park* 1983 - (6) (0.23) (0)   (4) (0.15) (0)   (0)  
1984 40 (1) (0.04) 1 0.04 6 0.23 0   1 0.04
Saskatchewan
Ceylon 1983 - (8) (0.31) 4 0.15 0   (0)   0  
1984 39 (4) (0.16) 6 0.24 0   0   0  
Craik 1984 38 (2) (0.08) 1 0.04 0   0   1 0.04
1985 40 (0)   1 0.04 0   0   1 0.04
Denzil 1984 40 (0)   3 0.12 0   0   1 0.04
1985 40 (0)   4 0.15 2 0.08 0   0  
Earl Grey* 1985 40 (1) (0.04) 2 0.08 2 0.08 0   0  
Goodwater 1983 - (14) (0.54) 4 0.15 0   0   1 0.04
Hanley* 1983 - (2) (0.08) (1) (0.04) (0)   (0)   (0)  
1984 39 (1) (0.04) 0   0   0   1 0.04
1985 40 (2) (0.08) 1 0.04 0   0   1 0.04
Inchkeith* 1984 40 (0)   3 0.12 2 0.08 0   0  
1985 38 (0)   1 0.04 3 0.12 0   1 0.04
Leask* 1984 21 (3) (0.22) 0   2 0.15 0   0  
1985 40 (3) (0.12) 0   6 0.23 0   0  
Shamrock 1983 - (2) (0.08) 2 0.08 0   0   1 0.04
1984 40 (8) (0.31) 2 0.08 0   0   1 0.04
1985 40 (5) (0.19) 4 0.15 0   0   0  
Yorkton* 1985 40 (1) (0.04) 0   4 0.15 0   1 0.04
United Statesc
Minnesota
Hawley* 1987 35 (0)   0   5 0.22 0   1 0.04
1988 33 (0)   0   4 0.19 0   4 0.19
Hitterdal* 1988 33 (1) (0.05) 0   3 0.14 0   2 0.09
Lake Park* 1987 30 (0)   0   2 0.10 0   0  
1988 33 (0)   0   0   0   1 0.05
North Dakota
Courtenay 1988 36 (1) (0.04) 2 0.09 1 0.04 0   1 0.04
Eldrige 1987 36 (0)   3 0.13 0   0   2 0.09
1988 35 (0)   0   0   0   0  
Fredonia 1987 36 (15) (0.67) 3 0.13 0   3 0.13 1 0.04
1988 36 (3) (0.13) 3 0.13 0   2 0.09 1 0.04
Jud 1987 36 (0)   4 0.17 0   0   1 0.04
1988 32 (0)   3 0.14 0   0   2 0.10
Kulm 1988 36 (1) (0.04) 1 0.04 0   2 0.09 1 0.04
Litchville 1987 36 (0)   3 0.13 0   0   1 0.04
1988 36 (0)   2 0.09 1 0.04 0   1 0.04

aStudy areas denoted with an asterisk (*) are in the aspen parkland; all other study areas are in the prairie.
bNumbers in parentheses represent incomplete counts of nests because some quarter sections were not completely searched (1983 only) or nest site selection prevented obtaining complete counts (northern harrier).
cExcludes the eight Central Flyway study areas where data on raptor nests were limited to incidental observations. Species and numbers of nests of each species in those study areas were: Morgan (Swainson's hawk [four], ferruginous hawk [one]); Plentywood (northern harrier [two]); Streeter (northern harrier [one], Swainson's hawk [one], ferruginous hawk [one]); Plaza (northern harrier [two], Swainson's hawk [one], great horned owl [one]); Parkston (red-tailed hawk [one]).


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