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 |