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Factors Associated with Duck Nest Success
in the Prairie Pothole Region of Canada

Appendix E

Table 4. Numbers (n), exposure periods (Days), and estimated rates of success (Rate) of northern shoveler nests by habitat, study area, and year in the Prairie Pothole Region of Canada. Rates of nest success were estimated by the modified Mayfield method (Johnson 1979).
Study area and year Cropland Grass Brush Wetland Hayland Woodland Right-of-way Odd areaa
n Days Rate n Days Rate n Days Rate n Days Rate n Days Rate n Days Rate n Days Rate n Days Rate
Earl Grey
1985 0 - - 0 - - 0 - - 0 - - 2 20.0 0.18 0 - - 2 24.0 0.05 2 10.0 <0.01
Hanley
1982 0 - - 2 29.5 0.31 0 - - 3 18.0 <0.01 0 - - 0 - - 0 - - 0 - -
1983 0 - - 1 4.0 0.0 0 - - 3 61.0 0.57 0 - - 0 - - 0 - - 1 16.0 1.00
1984 0 - - 0 - - 0 - - 0 - - 0 - - 0 - - 0 - - 1 4.0 0.0
1985 0 - - 4 67.0 .036 2 24.0 0.24 2 39.5 0.42 0 - - 0 - - 7 58.0 0.02 8 70.0 0.03
Hay Lakes
1983 0 - - 1 10.0 1.00 0 - - 8 64.5 0.02 5 37.5 0.02 0 - - 4 48.0 0.24 8 104.4 0.09
1984 0 - - 0 - - 0 - - 16 232.0 0.26 0 - - 0 - - 2 15.5 0.10 6 47.5 0.02
Holden
1983 0 - - 14 158.0 0.11 2 15.5 0.10 10 138.0 0.13 1 33.0 1.00 0 - - 0 - - 5 25.0 <0.01
Inchkeith
1984 0 - - 2 39.5 0.42 1 9.5 0.02 0 - - 0 - - 0 - - 0 - - 1 1.5 0.0
1985 1 2.0 0.0 3 25.0 0.01 0 - - 0 - - 0 - - 0 - - 2 16.0 0.11 7 51.5 0.03
Leask
1984 0 - - 3 30.0 0.10 0 - - 11 133.0 0.21 2 9.5 0.02 0 - - 2 14.5 0.01 3 21.0 0.03
1985 0 - - 5 18.0 0.0 0 - - 2 20.5 0.18 7 80.5 0.07 0 - - 1 5.0 <0.01 6 73.0 0.15
Moore Park
1983 0 - - 1 2.5 0.0 0 - - 5 89.0 0.68 0 - - 0 - - 2 19.0 0.02 5 26.0 <0.01
1984 0 - - 1 6.0 <0.01 0 - - 3 15.0 <0.01 0 - - 0 - - 1 4.0 0.0 11 143.0 0.14
Penhold
1984 0 - - 1 7.5 0.01 0 - - 1 5.5 <0.01 2 7.5 0.0 0 - - 1 7.0 0.01 0 - -
1985 0 - - 1 22.0 1.00 0 - - 2 37.5 0.40 0 - - 0 - - 1 5.5 <0.01 0 - -
Yorkton
1985 0 - - 8 88.0 0.14 1 3.0 0.0 2 29.5 0.31 0 - - 0 - - 1 22.0 1.00 4 40.0 0.03
Cartwright
1983 0 - - 1 4.0 0.0 0 - - 0 - - 0 - - 0 - - 1 31.0 1.0 0 - -
Ceylon
1983 0 - - 25 314.0 0.30 13 175.0 0.25 4 70.0 0.23 0 - - 0 - - 5 39.5 0.01 5 71.5 0.14
1984 0 - - 2 13.5 0.07 1 11.0 0.04 1 3.0 0.0 0 - - 0 - - 0 - - 0 - -
Craik
1984 0 - - 0 - - 0 - - 0 - - 0 - - 0 - - 0 - - 0 - -
1985 0 - - 1 20.0 1.00 0 - - 1 4.5 0.0 0 - - 0 - - 3 15.0 <0.01 3 31.5 0.03
Denzil
1984 0 - - 5 43.0 0.04 0 - - 2 16.0 0.01 0 - - 0 - - 2 16.5 0.01 1 14.5 0.09
1985 0 - - 5 72.5 0.39 0 - - 3 24.0 0.05 5 55.0 0.08 0 - - 7 56.5 0.01 8 72.0 0.05
Gayford
1985 0 - - 3 53.0 0.52 0 - - 0 - - 0 - - 0 - - 1 16.0 1.00 0 - -
Goodwater
1983 0 - - 10 171.5 0.55 4 52.5 0.52 3 38.5 0.16 2 29.5 0.31 0 - - 7 85.5 0.13 2 32.0 0.34
Shamrock
1982 1 11.5 0.05 22 308.9 0.23 4 50.0 0.25 2 15.0 0.01 14 170.0 0.24 0 - - 12 130.5 0.07 1 8.0 1.00
1983 6 55.5 0.04 18 152.0 0.13 10 136.5 0.28 2 11.5 <0.01 17 252.0 0.22 0 - - 8 101.0 0.18 8 100.9 0.12
1984 0 - - 2 8.5 0.0 0 - - 0 - - 0 - - 0 - - 0 - - 0 - -
1985 0 - - 0 - - 0 - - 0 - - 1 20.0 1.00 0 - - 1 3.5 0.0 3 37.0 0.15
Tichfield
1982 0 - - 2 23.0 0.22 2 12.5 <0.01 0 - - 1 20.0 1.00 0 - - 4 23.0 <0.01 2 49.0 1.00
aOdd area included patches of cover <2ha in size and an array of features usually found in Cropland (e.g., rock piles, gravel borrow pits, narrow   borders of upland vegetation around Wetland and along fences between areas of Cropland).
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