Waterfowl Communities in the Northern Plains
Table 3
Table 3. Correlation coefficients between annual counts of dabbling ducks at Woodworth Study Area, North Dakota, during 1965-89.
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American Green-winged Blue-winged Nothern Northern Lesser Ruddy
Gadwall Wigeon Teal Teal Shoveler Pintail Redhead Canvasback Scaup Duck
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Mallard 0.52** 0.17 0.09 0.31 0.31 0.29 0.28 -0.01 0.02 0.05
Gadwall 0.40* 0.47* 0.52** 0.19 0.57** 0.01 -0.24 -0.31 0.08
Am. Wigeon 0.73*** 0.10 -0.01 0.59** -0.50* -0.37 -0.38 -0.38
G.-w. Teal 0.03 -0.07 0.48* -0.49* -0.37 -0.45* -0.26
B.-w. Teal 0.49* 0.40* 0.08 -0.19 -0.34 0.16
N. Shoveler 0.45* 0.46* 0.39 0.08 0.40*
N. Pintail -0.06 -0.06 -0.21 0.15
Redhead 0.52** 0.54** 0.71***
Canvasback 0.57** 0.50*
Lesser Scaup 0.34
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* P < 0.05
** P < 0.01
*** P < 0.001
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