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

Table 38. Brood densities of 12 duck species, expressed as broods per 40.5 ha,
by wetland class during July and August,
Woodworth Study Area, 1965-75.

Table 38. Brood densities of 12 duck species, expressed as broods per 40.5 ha, by wetland class during July and August, Woodworth Study Area, 1965-75.
  Broods per 40.5 ha by size classa of wetlands
Species I It II IIt III IIIt T-2+3+4 IV V Dams Dugouts
Dabbling ducks
Mallard 0.0 0.0 0.0 0.0 1.3 0.0 0.0 1.5 0.3 2.0 9.1
Gadwall 0.0 0.0 0.0 0.0 1.5 5.0 0.0 2.6 0.1 4.3 0.0
Northern pintail 0.0 0.0 0.0 0.0 0.7 5.0 0.0 0.6 0.6 0.9 0.0
Green-winged teal 0.0 0.0 0.0 0.0 0.7 0.0 0.0 0.4 0.0 0.2 0.0
Blue-winged teal 0.0 73.0 2.4 0.0 14.2 0.0 0.0 11.0 0.4 11.2 0.0
Northern shoveler 0.0 0.0 0.0 0.0 1.6 0.0 0.0 0.8 0.0 1.0 0.0
American wigeon 0.0 0.0 0.0 0.0 0.5 5.0 0.0 0.4 0.0 0.2 0.0
Total dabbling ducks 0.0 73.0 2.4 0.0 20.5 15.0 0.0 17.3 1.4 19.8 9.1
Diving ducks
Redhead 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.5 0.4 0.2 0.0
Canvasback 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.4 0.0 0.1 0.0
Lesser scaup 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 0.6 1.0 0.0
Ring-necked duck 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.0
Ruddy duck 0.0 0.0 0.0 0.0 0.3 0.0 0.0 1.2 0.5 0.8 0.0
Total diving ducks 0.0 0.0 0.0 0.0 0.5 0.0 0.0 2.4 1.6 2.2 0.0
Grand total 0.0 73.0 2.4 0.0 21.0 15.0 0.0 19.7 3.0 22.0 9.1
aSize classes according to classification of Stewart and Kantrud 1971.
tSuperscript t indicates tillaged class

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