Northern Prairie Wildlife Research Center
| Table 19. Percent change of broods/km² in the Waubay study area, Day County, South Dakota, 1992-1993, 1950-1953. | ||||||||
| Species | Broods/km² | % change from 1992 to 1993 |
Broods/km² | % change from 1950s to 1990s |
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| 1992 | 1993 | Mean 1990sa | Mean 1950sb | |||||
| Dabbling ducks | ||||||||
| Mallard | 0.9 | 0.8 | - 4.5 | 0.9 | 0.9 | - 2.3 | ||
| Gadwall | 0.5 | 0.9 | + 64.5 | 0.7 | 1.4 | - 48.6 | ||
| Northern pintail | 0.0 | 0.2 | + 100.0 | 0.1 | 0.7 | - 89.5 | ||
| Blue-wing teal | 0.7 | 2.4 | + 258.8 | 1.6 | 4.7 | - 68.3 | ||
| Northern shoveler | 0.2 | 0.4 | +100.0 | 0.3 | 0.2 | + 50.0 | ||
| Total dabblers | 2.3 | 4.7 | + 104.3 | 3.5 | 7.9 | - 55.7 | ||
| Diving ducks | ||||||||
| Redhead | 0.7 | 0.3 | - 52.9 | 0.5 | 0.2 | + 108.3 | ||
| Canvasback | 0.2 | 0.3 | + 50.0 | 0.3 | tr. | + 500.0 | ||
| Ruddy duck | 0.2 | 0.6 | + 200.0 | 0.4 | 0.8 | - 47.5 | ||
| Total divers | 1.1 | 1.2 | + 9.1 | 1.2 | 1.0 | + 15.0 | ||
| Total | 3.4 | 6.3 | + 79.8 | 4.9 | 9.0 | - 49.4 | ||
| 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/tab19.htm
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