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

Table 10. Mean percent occupancy of wet ponds by duck pairs
during late May-early June counts,
Woodworth Study Area, 1965-75.


Table 10. Mean percent occupancy of wet ponds by duck pairs during late May-early June counts,
Woodworth Study Area, 1965-75.
  Mean percent occupancy of wet ponds
  Year n 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
Species   344 352 363 362 336 286 267 320 55 368 359 310
Dabbling ducks
Mallard   8.7 11.4 11.0 12.4 6.5 12.9 9.0 12.5 52.7 6.3 11.4 10.9
Gadwall   17.7 18.8 12.9 13.2 12.2 17.8 13.9 14.7 63.6 12.8 19.2 16.1
American wigeon   3.2 2.3 2.8 2.2 2.1 4.5 3.0 4.1 18.2 2.2 1.7 3.0
Green-winged teal   3.5 2.6 3.0 2.5 3.0 3.8 4.1 2.5 5.5 1.1 1.1 2.7
Blue-winged teal   41.3 40.3 48.8 30.7 39.6 36.0 24.7 34.1 67.3 35.9 47.4 38.7
Northern shoveler   10.8 6.0 7.4 4.4 7.4 10.5 4.9 6.6 18.2 3.5 7.8 7.1
Northern pintail   11.6 7.7 6.9 2.5 5.4 9.4 7.5 5.3 18.2 7.6 7.8 7.3
Total dabbling ducks   50.9 49.7 56.7 38.7 46.1 43.7 33.3 42.5 85.5 44.8 53.8 47.1
Diving ducks
Redhead   2.3 2.6 0.6 1.7 2.4 2.4 1.9 0.9 3.6 2.2 5.0 2.2
Canvasback   0.9 1.1 0.0 0.0 0.3 0.0 0.4 0.0 1.8 0.0 0.3 0.3
Lesser scaup   2.6 1.1 0.8 1.1 2.7 3.1 2.6 3.4 14.5 2.2 1.7 2.3
Ring-necked duck   0.0 0.6 0.6 0.0 0.6 0.0 0.7 0.0 1.8 0.0 0.0 0.3
Ruddy duck   1.7 1.4 0.3 0.3 1.2 0.0 0.4 0.6 3.6 2.4 3.6 1.3
Total diving ducks   4.9 5.4 1.9 2.8 4.8 5.2 4.9 3.4 16.4 5.2 6.7 4.7
Total pairs   51.2 50.9 57.0 39.0 46.4 44.1 33.7 42.5 85.5 45.7 54.3 47.5

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