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

Table 9. Mean percent occupancy of wet ponds by duck pairs
of all species on mid-May counts,
Woodworth Study Area, 1965-75.


Table 9. Mean percent occupancy of wet ponds by duck pairs of all species on mid-May counts,
Woodworth Study Area, 1965-75.
  Percent occupancy of wetlands with water
  Year 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
Species n ponds 393 425 411 370 351 338 195 384 156 371 412 346
Dabbing ducks
Mallard   8.9 9.4 8.0 12.1 6.6 9.2 18.5 11.7 19.9 8.1 5.8 9.8
Gadwall   8.9 11.5 12.2 10.3 12.3 11.2 19.0 8.1 14.7 7.0 9.2 10.7
American wigeon   2.0 2.1 1.9 2.2 2.6 4.1 5.6 2.9 5.1 2.4 1.5 2.7
Green-winged teal   1.3 2.6 2.7 3.2 1.1 4.4 3.6 1.3 7.1 1.9 1.0 2.4
Blue-winged teal   26.7 26.8 35.8 27.8 34.5 27.8 29.7 19.0 14.1 16.2 26.7 26.5
Northern shoveler   9.7 4.9 2.9 4.3 4.6 8.9 6.7 5.7 5.1 1.6 5.6 5.4
Northern pintail   6.6 4.9 5.6 2.4 5.7 5.6 7.2 8.1 9.0 4.6 5.1 5.6
Total dabbling ducks   35.6 37.2 43.6 37.6 41.0 37.3 41.5 34.9 31.4 24.0 34.5 36.3
Diving ducks
Redhead   2.0 1.9 1.7 2.2 2.3 3.0 1.0 0.5 1.3 2.7 3.2 2.0
Canvasback   1.0 0.0 0.2 1.1 0.0 0.0 0.5 0.3 0.0 0.3 1.0 0.4
Lesser scaup   1.8 2.8 4.9 2.4 2.3 2.7 3.1 2.6 2.6 1.9 1.7 2.6
Ring-necked duck   0.3 0.5 0.5 0.0 0.9 2.1 1.5 0.5 1.3 0.5 1.0 0.7
Ruddy duck   1.0 1.2 0.7 0.3 1.1 1.2 1.0 0.5 0.0 0.3 1.0 0.8
Total diving ducks   3.8 4.0 6.3 4.9 4.6 5.0 4.6 2.9 3.8 4.3 4.4 4.4
Total pairs   36.4 37.4 44.8 38.1 41.0 37.3 42.1 35.2 32.1 24.3 35.2 36.8

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