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

Table 37. Brood densities of 12 duck species, expressed as broods per 40.5 ha,
by wetland size class during July and August,
Woodworth Study Area, 1965-75.

Table 37. Brood densities of 12 duck species, expressed as broods per 40.5 ha, by wetland size class during July and August, Woodworth Study Area, 1965-75.
  Brood per 40.5 ha in wetlands of size class
Species ≤0.9 0.10-0.25 0.26-0.50 0.51-0.75 0.76-1.00 1.01-2.00 2.01-5.00 5.01-10.00 10.01-25.00 ≥25.01
Dabbling ducks
Mallard 0.0 0.9 0.4 1.9 0.5 1.4 1.5 1.9 2.1 0.6
Gadwall 0.0 1.7 0.8 0.5 1.0 1.4 1.1 0.9 4.3 1.5
Northern pintail 0.0 2.6 0.4 0.9 1.0 0.1 0.5 0.3 1.0 0.5
Green-winged teal 0.0 0.9 0.4 0.5 1.0 0.3 1.4 0.3 0.3 0.1
Blue-winged teal 11.0 22.6 13.4 17.9 12.0 20.5 17.8 10.1 12.7 2.6
Northern shoveler 5.5 0.9 0.0 2.4 2.0 1.3 1.6 0.9 1.1 0.2
American wigeon 0.0 0.9 0.0 0.0 0.0 0.1 0.3 0.6 1.0 0.1
Total dabbling ducks 16.5 30.4 15.4 24.0 17.5 25.2 24.3 15.2 22.4 5.6
Diving ducks
Redhead 0.0 0.0 0.0 0.0 0.0 0.1 0.1 1.3 0.6 0.3
Canvasback 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.0 0.6 0.1
Lesser scaup 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.5 0.5
Ring-necked duck 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1
Ruddy duck 0.0 1.7 0.4 0.0 0.5 0.4 0.8 1.3 1.3 0.5
Total diving ducks 0.0 1.7 0.4 0.0 0.5 0.6 1.2 2.5 3.0 1.5
Grand total 16.5 32.2 15.8 24.0 18.0 25.8 25.5 17.7 25.4 7.1
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