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

Table 15

Table 15. Percent clutch success of upland nests in the Waubay study area, Day County, South Dakota, 1992-1993.
Species 1992 1993 1992-93
n App.a Mayfield n App. Mayfield n App. Mayfield
    Mallard 6 16.7 5.0 (0.4-66.8)b 4 0.0 0.0 10 10.0 1.5 (0.1-22.4)
    Gadwall 1 0.0 17.8 (0.5-100.0) 2 50.0 35.7 (4.3-100.0) 3 33.3 27.7 (4.3-100.0)
    Northern pintail 2 0.0 0.0 0 0.0 0.0 2 0.0 0.0
    Blue-wing teal 13 30.7 13.3 (3.4-49.6) 9 33.3 12.9 (2.3-66.1) 22 31.8 13.1 (4.5-36.8)
    Northern shoveler 1 0.0 9.6 (0.0-100.0) 2 0.0 0.2 (0.0-100.0) 3 0.0 1.6 (0.0-100.0)
Total 23 21.7 8.2 (2.5-26.2) 17 23.5 5.7 (1.1-26.9) 40 22.5 7.1 (2.7-18.2)
a Apparent clutch success = the number of successful nesting attempts/the total number of nesting attempts.
b Values in ( ) are 95% CIs for Mayfield estimates (Klett et al. 1986). The variance of the estimate is greatly affected by sample size and number of exposure days. Thus, smaller sample sizes and/or fewer exposure days lead to larger variances and wider confidence intervals.

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