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

Table 12. Mean percent occupancy by duck pairs in wet ponds
by size class late May-early June counts,
Woodworth Study Area, 1965-75.


Table 11. Mean percent occupancy by duck pairs in wet ponds by size class late May-early June counts,
Woodworth Study Area, 1965-75
  Mean percent occupancy of wet ponds in size class (ha)
   Size class 0.09 0.10-0.25 0.26-0.5 0.51-0.75 0.76-1.0 1.01-2.00 2.01-5.0 5.01-10.0 10.01-25.0 25.01
Species Average number per year 41 79 72 29 22 31 20 3 9 4
Dabbling ducks
Mallard   2.2 3.3 6.0 12.4 15.6 15.8 29.6 35.3 55.1 50.0
Gadwall   0.9 6.7 10.3 17.5 20.2 22.3 44.4 58.1 76.5 75.0
American wigeon   0.0 0.9 1.3 2.2 4.9 3.2 6.7 9.7 29.6 15.9
Green-winged teal   0.4 1.3 1.9 2.5 4.1 3.2 4.0 3.2 16.3 20.5
Blue-winged teal   12.7 27.3 30.1 43.9 52.3 59.8 74.9 77.4 89.9 90.9
Northern shoveler   0.9 2.8 3.5 5.4 8.2 11.1 21.5 22.6 43.9 27.3
Northern pintail   1.5 2.3 5.0 7.0 10.3 12.9 17.9 22.6 33.7 25.0
Total dabbling ducks   16.5 33.9 39.6 53.2 64.6 17.6 84.8 96.8 95.9 93.2
Diving ducks
Redhead   0.0 0.0 0.3 1.6 2.1 3.5 4.9 9.7 29.6 20.5
Canvasback   0.0 0.0 0.0 0.3 0.4 0.3 0.4 3.2 5.1 2.3
Lesser scaup   0.2 0.3 0.1 1.3 0.4 2.6 4.0 3.2 30.6 43.2
Ring-necked duck   0.0 0.1 0.0 0.3 0.0 0.0 0.4 0.0 4.1 4.5
Ruddy duck   0.0 0.0 0.0 0.3 0.0 0.6 1.8 9.7 23.5 25.0
Total diving ducks   0.2 0.5 0.4 2.9 2.5 6.7 10.8 22.6 55.1 65.9
Total pairs   16.7 33.9 39.9 53.8 65.0 73.0 85.2 100.0 96.9 95.5

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