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Waterfowl Communities in the Northern Plains

Table 5

Table 5. Correlations between counts of ducks and proximate habitat and weather variables, previous year's count, and continental index to population size at Woodworth Study Area, North Dakota, 1965-89.

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                       May      Conserved         Mean temp.      Precip.     Previous  Continental
                                               _______________ _____________
                      ponds   soil moisture    April     May    April    May   count      index
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Mallard                0.21       0.24        -0.22    -0.01    0.23   -0.11  -0.48**    0.10
Gadwall                0.26       0.16        -0.42**  -0.11    0.36*  -0.19  -0.12      0.03
American Wigeon        0.04      -0.11        -0.22    -0.09   -0.09    0.24   0.33      0.30
Green-winged Teal      0.01       0.05        -0.22    -0.16   -0.05   -0.09   0.26      0.11
Blue-winged Teal       0.71***    0.55***     -0.39*   -0.36*   0.44** -0.12  -0.00      0.40**
Northern Shoveler      0.58***    0.35        -0.41**  -0.20    0.13    0.16   0.04      0.20
Northern Pintail       0.37*      0.17        -0.42**  -0.17    0.14    0.17   0.04      0.55***
Redhead                0.26       0.06        -0.12     0.04   -0.13    0.20   0.43**    0.14
Canvasback             0.06      -0.12         0.09     0.14   -0.02    0.05   0.66***  -0.03
Lesser Scaup           0.10       0.10         0.15     0.39*  -0.16    0.25   0.51**   -0.00
Ruddy Duck             0.35*      0.04        -0.22    -0.08   -0.09    0.17   0.38*     0.63***
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*P < 0.10
**P < 0.05
***P < 0.01

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