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Waterfowl and Habitat Changes
After 40 Years on the Waubay Study Area

Table 17

Table 17. Brood densities (broods/km²) and species composition (%) of counted broods in the Waubay study area, Day County, South Dakota, 1950-1953, 1992-1993.
Species # of Broods Production
(Broods/km2)		 1950-53 Production
(Broods/km2)		 Percent of
Total Broods
1992 1993 1992 1993 1950 1951 1952 1953 4-yr Avg. 1992 1993 1950-53
Dabbling ducks
    Mallard 25 24 0.9 0.8 0.7 0.9 0.8 1.0 0.8 25.0 13.1 9.3
    Gadwall 16 26 0.5 0.9 1.2 1.0 2.0 1.4 1.4 16.0 14.2 15.3
    Northern pintail 0 4 0.0 0.2 0.4 0.8 1.0 0.7 0.7 0.0 2.2 8.1
    Green-wing teal 0 1 0.0 tr. 0.0 0.0 0.1 tr. tr. 0.0 0.5 0.4
    Blue-wing teal 19 69 0.7 2.4 3.7 4.6 5.3 5.4 4.7 19.0 37.7 52.2
    Northern shoveler 5 12 0.2 0.4 0.2 0.2 0.2 0.2 0.2 5.0 6.6 2.1
    American wigeon 0 0 0.0 0.0 0.0 0.0 tr. 0.1 tr. 0.0 0.0 0.4
    Wood duck 1 0 tr. 0.0 — — — — — 1.0 0.0 —
Total dabblers 66 136 2.3 4.7 6.2 7.5 9.4 8.8 7.8 66.0 74.3 87.8
Diving ducks
    Redhead 19 9 0.7 0.3 0.2 0.1 0.5 0.2 0.2 19.0 4.9 2.5
    Canvasback 4 9 0.2 0.3 0.0 0.1 0.1 0.0 tr. 4.0 4.9 0.4
    Lesser scaup 0 1 0.0 tr. tr. 0.1 0.1 0.1 0.1 0.0 0.5 0.9
    Ruddy duck 7 17 0.2 0.6 0.1 0.8 1.2 0.8 0.8 7.0 9.3 8.5
Total divers 30 36 1.1 1.2 0.3 1.1 1.9 1.2 1.1 30.0 19.6 12.3
    Unidentified 4 11 0.2 0.4 0.0 tr. 0.0 0.0 tr. 4.0 6.0 —
Total 100 183 3.4 6.3 6.4 8.6 11.3 10.0 9.1 100.0 99.9 100.0

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