Waterfowl Production on the Woodworth Station
in South-central North Dakota, 1965-1981

Table 29. Percent Mayfield nest success (numbers of nests in parentheses)
and nest density (nests per 40.5 ha) by field size class and year,
Woodworth Study Area, 1966-81.


Table 29. Percent Mayfield nest success (numbers of nests in parentheses) and nest density (nests per 40.5 ha) by field size class and year, Woodworth Study Area, 1966-81.
  Size classes of fields (ha)
Year <4 4-16 8-16 16-32 >32b
Mayfield nest successa
1966b 4.7 (37) --c (0) -- (0) -- (0) -- (0)
1967 4.7 (15) 3.8 (15) 4.6 (31) 4.3 (57) -- (0)
1968 2.4 (14) 13.5 (15) 7.0 (61) 10.5 (34) 2.1 (13)
1969 25.5 (13) 26.7 (25) 37.1 (67) 17.8 (41) -- (0)
1970 6.9 (30) 12.1 (42) 13.4 (63) 17.1 (56) 8.1 (90)
1971 34.9 (28) 16.4 (20) 32.9 (59) 39.9 (30) 24.2 (87)
1972 8.2 (27) 9.1 (44) 9.0 (77) 9.7 (65) 14.0 (136)
1973 4.2 (13) 14.3 (27) 7.3 (55) 5.4 (17) 11.7 (71)
1974 19.5 (25) 30.8 (50) 14.3 (61) 17.9 (40) 18.3 (136)
1975 15.6 (26) 16.4 (72) 23.2 (83) 18.7 (48) 12.7 (201)
1976 16.9 (22) 5.8 (64) 10.6 (83) 9.0 (55) 17.5 (129)
1977 18.0 (10) 10.8 (24) 34.8 (49) 10.7 (26) 30.0 (40)
1978 28.8 (29) 29.1 (65) 33.0 (143) 13.2 (53) 37.6 (128)
1979 43.2 (4) 9.2 (18) 28.8 (81) 16.9 (34) -- (0)
1980 14.7 (8) 9.7 (17) 15.3 (48) 6.0 (16) -- (0)
1981 31.6 (6) 6.4 (14) 16.0 (25) 32.8 (18) 24.7 (78)
Total 13.4 (307) 14.7 (512) 18.7 (986) 13.3 (590) 17.8 (11,109)
Mayfield nest densities
1966 -- -- -- -- --
1967 150 38.8 39.8 45.2 --
1968 929 32.1 62.0 27.3 53.1
1969 235 37.4 49.1 20.8 --
1970 178 69.5 46.2 26.9 34.2
1971 88.8 40.4 27.4 11.3 22.3
1972 70.4 64.1 50.3 35.5 36.1
1973 102 30.8 39.6 8.7 20.7
1974 77.6 27.8 36.7 22.2 33.2
1975 59.0 76.0 37.8 27.6 49.8
1976 91.1 77.4 37.5 43.4 28.9
1977 60.1 30.9 18.1 24.3 9.9
1978 77.8 57.8 51.5 32.7 26.2
1979 57.9 85.7 113 152 --
1980 85.2 109 101 16 --
1981 73.1 43.6 27.5 15.8 17.1
Total 114 50.8 43.3 28.5 27.8
aNest success varied among years (X214 = 127.7, P <0.001) but not among field size classes (X23 = 4.6, P > 0.10). The interaction wa not significant (X242 = 43.3, P > 0.25).
bCategory not used in analysis because of incommplete data.
cNo data.


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