Northern Prairie Wildlife Research Center
| Table 7. Percent change of breeding pairs/km² in the Waubay study area, Day County, South Dakota, 1992-1993, 1950-1953. | ||||||
| Species | Pairs/km² | Pairs/km² | ||||
| 1992 | 1993 | % change from 1992 to 1993 |
Mean 1990sa |
Mean 1950sb |
% change from 1950s to 1990s |
|
| Dabbling ducks | ||||||
| Mallard | 7.3 | 7.7 | + 5.5 | 7.5 | 3.4 | + 120.6 |
| Gadwall | 4.7 | 4.1 | - 12.8 | 4.4 | 3.9 | + 12.8 |
| Northern pintail | 0.6 | 1.5 | + 125.0 | 1.1 | 2.4 | - 54.2 |
| Green-wing teal | 0.2 | 0.3 | — | 0.3 | 0.1 | — |
| Blue-wing teal | 10.8 | 16.5 | + 52.8 | 13.7 | 11.8 | + 16.1 |
| Northern shoveler | 1.8 | 1.9 | + 5.6 | 1.9 | 0.9 | + 111.0 |
| American wigeon | 0.1 | tr. | — | tr. | 0.2 | — |
| Wood duck | 0.2 | 0.1 | — | 0.1 | tr. | — |
| Total dabblers | 25.7 | 32.1 | + 24.9 | 28.9 | 22.7 | + 41.4 |
| Diving ducks | ||||||
| Redhead | 3.7 | 4.3 | + 16.2 | 4.0 | 0.8 | + 400.0 |
| Canvasback | 0.3 | 0.3 | + 14.3 | 0.3 | 0.2 | + 50.5 |
| Lesser scaup | 0.3 | tr. | - 62.5 | 0.2 | 0.4 | - 50.0 |
| Ruddy duck | 0.8 | 1.3 | + 15.7 | 1.1 | 0.9 | + 22.2 |
| Total divers | 5.1 | 5.9 | + 15.7 | 5.5 | 2.3 | + 156.5 |
| Total | 30.8 | 38.0 | + 23.4 | 34.4 | 25.0 | + 52.0 |
| a Pooled 1992, 1993. b Pooled 1950, 1951, 1952, 1953. |
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U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/waubay/tab7.htm
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