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Waterfowl and Habitat Changes
After 40 Years on the Waubay Study Area

Tables & Figures

Table 1 - Average monthly precipitation at Waubay National Wildlife Refuge.
Table 2 - Comparison of land use practices in the Waubay study area.
Table 3 - Percent composition of wetland basins by class and percent drainage of wetlands.
Table 4 - Chronology of drainage by wetland class.
Table 5 - Total ducks and indicated breeding pairs tabulated during four pair counts.
Table 6 - Density and percent composition of duck breeding pairs.
Table 7 - Percent change of breeding pairs/km².
Table 8 - Use (%) of different wetland classes by breeding pairs.
Table 9 - Breeding pairs/ha of undrained wetland by wetland class.
Table 10 - Use (%) of different wetland sizes by dabbling and diving duck pairs.
Table 11 - Percent clutch success of over-water nests.
Table 12 - Fates of 130 over-water and 40 upland nests.
Table 13 - Percent of over-water nests for five waterfowl species found in different wetland classes.
Table 14 - Mean water depths and distances from nearest shoreline of over-water nests.
Table 15 - Percent clutch success of upland nests.
Table 16 - Ducklings and goslings produced from monitored nests.
Table 17 - Brood densities and species composition of counted broods.
Table 18 - comparisons of brood densities of ducks, with a 2-sample paired differences t-test.
Table 19 - Percent change of broods/km².
Table 20 - Comparison of pair/brood ratio and hen success (broods/100 pairs).
Table 21 - Use (%) of different wetland sizes by broods.

Figure 1 - The Waubay study area, Day County, South Dakota, 1950-1953 and 1992-1993.
Figure 2 - Annual precipitation in the Waubay study area.
Figure 3 - The Waubay study area, divided into 42 quarter sections.
Figure 4 - Wetland numbering system, section 14, quarter 1, Waubay study area.
Figure 5 - Over-water canvasback nest in a seasonal wetland.
Figure 6 - Percent of wetlands in different wetland classes.
Figure 7 - Percent of 173 wetland basins by wetland class that have been drained or restored.
Figure 8 - Total pairs densities in relation to April-August precipitation.
Figure 9 - Percent of basins containing >10% standing water at four time periods from May-August.
Figure 10 - Road on east side of the Waubay study area, flooded from abundant summer rain fall in 1993.
Figure 11 - Use (%) of different wetland sizes by dabbling duck pairs.
Figure 12 - Use (%) of different wetland sizes by diving duck pairs.
Figure 13 - Percent of nests destroyed by mammalian predators during 6 different nest initiation periods.
Figure 14 - Annual pair densities compared to annual brood densities.
Figure 15 - Use (%) of different wetland classes by broods.

U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/waubay/tabfig.htm
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Page Last Modified: Friday, 01-Feb-2013 20:04:15 EST
Menlo Park, CA [caww54]