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

Table 11. Mean percent occupancy by duck pairs in wet ponds
by perimeter length during late May-early June counts,
Woodworth Study Area, 1965-75.


Table 11.Mean percent occupancy by duck pairs in wet ponds by perimeter length during late May-early June counts,
Woodworth Study Area, 1965-75.
  Mean percent occupancy of wet ponds with perimeter length (m)
  Perimeter length 100 100-249 250-499 500-749 750-999 1,000-1,999 2,000-5,000 5000
Species Average no. ponds per year 8 43 97 71 30 43 15 3
Dabbling ducks
Mallard   2.2 1.5 4.0 9.3 13.8 21.4 48.5 60.6
Gadwall   0.0 2.8 6.9 14.9 21.6 29.1 67.1 78.8
American wigeon   0.0 0.6 0.9 1.5 3.6 4.9 18.0 36.4
Green-winged teal   0.0 0.4 1.4 2.1 3.3 4.7 11.4 21.2
Blue-winged teal   18.7 13.6 27.7 37.8 52.7 63.0 88.6 93.9
Northern shoveler   2.2 0.9 3.1 4.4 9.0 14.5 34.1 39.4
Northern pintail   2.2 0.9 3.3 6.3 10.2 15.6 23.4 39.4
Total dabbling ducks   22.0 17.9 35.3 47.8 65.0 73.5 95.2 97.0
Diving ducks
Redhead   0.0 0.0 0.1 1.0 2.4 3.0 18.0 45.5
Canvasback   0.0 0.0 0.0 0.1 0.0 0.6 1.8 12.1
Lesser scaup   0.0 0.2 0.3 0.5 1.8 2.8 20.4 51.5
Ring-necked duck   0.0 0.0 0.1 0.1 0.0 0.2 0.0 18.2
Ruddy duck   0.0 0.0 0.0 0.1 0.6 0.6 18.0 24.2
Total diving ducks   0.0 0.2 0.5 1.5 4.5 6.6 40.7 84.8
Total pairs   22.0 18.1 35.4 48.3 65.3 74.6 96.4 100.00

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