Percent occupancy of wetlands with water | |||||||||||||
Year | 1965 | 1966 | 1967 | 1968 | 1969 | 1970 | 1971 | 1972 | 1973 | 1974 | 1975 | ![]() |
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Species | n ponds | 393 | 425 | 411 | 370 | 351 | 338 | 195 | 384 | 156 | 371 | 412 | 346 |
Dabbing ducks | |||||||||||||
Mallard | 8.9 | 9.4 | 8.0 | 12.1 | 6.6 | 9.2 | 18.5 | 11.7 | 19.9 | 8.1 | 5.8 | 9.8 | |
Gadwall | 8.9 | 11.5 | 12.2 | 10.3 | 12.3 | 11.2 | 19.0 | 8.1 | 14.7 | 7.0 | 9.2 | 10.7 | |
American wigeon | 2.0 | 2.1 | 1.9 | 2.2 | 2.6 | 4.1 | 5.6 | 2.9 | 5.1 | 2.4 | 1.5 | 2.7 | |
Green-winged teal | 1.3 | 2.6 | 2.7 | 3.2 | 1.1 | 4.4 | 3.6 | 1.3 | 7.1 | 1.9 | 1.0 | 2.4 | |
Blue-winged teal | 26.7 | 26.8 | 35.8 | 27.8 | 34.5 | 27.8 | 29.7 | 19.0 | 14.1 | 16.2 | 26.7 | 26.5 | |
Northern shoveler | 9.7 | 4.9 | 2.9 | 4.3 | 4.6 | 8.9 | 6.7 | 5.7 | 5.1 | 1.6 | 5.6 | 5.4 | |
Northern pintail | 6.6 | 4.9 | 5.6 | 2.4 | 5.7 | 5.6 | 7.2 | 8.1 | 9.0 | 4.6 | 5.1 | 5.6 | |
Total dabbling ducks | 35.6 | 37.2 | 43.6 | 37.6 | 41.0 | 37.3 | 41.5 | 34.9 | 31.4 | 24.0 | 34.5 | 36.3 | |
Diving ducks | |||||||||||||
Redhead | 2.0 | 1.9 | 1.7 | 2.2 | 2.3 | 3.0 | 1.0 | 0.5 | 1.3 | 2.7 | 3.2 | 2.0 | |
Canvasback | 1.0 | 0.0 | 0.2 | 1.1 | 0.0 | 0.0 | 0.5 | 0.3 | 0.0 | 0.3 | 1.0 | 0.4 | |
Lesser scaup | 1.8 | 2.8 | 4.9 | 2.4 | 2.3 | 2.7 | 3.1 | 2.6 | 2.6 | 1.9 | 1.7 | 2.6 | |
Ring-necked duck | 0.3 | 0.5 | 0.5 | 0.0 | 0.9 | 2.1 | 1.5 | 0.5 | 1.3 | 0.5 | 1.0 | 0.7 | |
Ruddy duck | 1.0 | 1.2 | 0.7 | 0.3 | 1.1 | 1.2 | 1.0 | 0.5 | 0.0 | 0.3 | 1.0 | 0.8 | |
Total diving ducks | 3.8 | 4.0 | 6.3 | 4.9 | 4.6 | 5.0 | 4.6 | 2.9 | 3.8 | 4.3 | 4.4 | 4.4 | |
Total pairs | 36.4 | 37.4 | 44.8 | 38.1 | 41.0 | 37.3 | 42.1 | 35.2 | 32.1 | 24.3 | 35.2 | 36.8 |