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

Table 14. Correlation coefficients between duck pairs per year and 1-15 May water counts,
Woodworth Study Area, 1965-81.

Table 14. Correlation coefficients between duck pairs per year and 1-15 May water counts, Woodworth Study Area, 1965-81.
Species r-valuesa
Dabbling ducks
Mallard 0.1908
Gadwall 0.5518
Northern pintail 0.4261
Green-winged teal 0.1013
Blue-winged teal 0.8267
Northern shoveler 0.4608
American wigeon 0.2140
Total dabbling ducks 0.8135
Diving Ducks
Redhead 0.3757
Canvasback -0.0767
Lesser scaup 0.0407
Ruddy duck 0.2897
Ring-necked duck -0.0883
Total diving ducks 0.2811
Total pairs 0.7966
ar-values > 0.48 were significant, at 16 df

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