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

Table 43. Estimates of broods per 100 pairs of ducks,
Woodworth Study Area, 1965-81a.

Table 43. Estimates of broods per 100 pairs of ducks, Woodworth Study Area, 1965-81a.
Species 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 Mean
Mallard 18 50 17 3 62 19 57 17 7 30 31 4 54 23 20 16 50 25
Gadwall 29 45 25 24 64 15 73 19 8 54 16 19 61 22 21 33 28 30
Northern pintail 38 41 15 36 79 11 8 11 9 34 14 7 20 7 24 6 15 22
Green-winged teal 33 90 54 57 33 25 64 8 7 75 33 0 0 25 0 10 0 32
Blue-winged teal 30 70 36 31 65 28 79 34 29 21 38 4 31 19 23 21 26 33
Northern shoveler 23 70 45 19 61 23 27 31 13 25 18 3 14 15 11 14 6 25
American wigeon 31 42 7 22 44 20 100 24 0 36 14 0 33 33 83 23 88 31
Redhead 50 11 40 21 19 44 33 29 0 32 11 18 0 6 5 44 23 21
Canvasback 9 67 0 0 50 50 0 100 50 250 22 133 0 33 79 28 93 50
Lesser scaup 26 21 0 23 32 14 41 17 0 3 9 13 0 31 0 26 52 18
Ruddy duck 23 127 250 22 36 500 200 38 0 26 33 313 0 29 4 33 13 39
Ring-necked duck 0 40 50 0 200 0 0 0 0 0 0 100 0 0 0 50 0 32
Total 28 58 34 25 60 23 64 27 15 29 29 61 36 22 30 22 33 30
aNumbers greater than 100 are due to the difficulty of determining accurate pair estimates or brood immigration into the area or both.

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