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Are Mallards Declining in North America?

Tables

Table 1. Comparison of annual percent change in mallard numbers during 1971-1985 as predicted by a model (given in text) based on 1955-1970 data to actual changes.
Year % Change
Predicted Actual
1971 15.8 -5.2
1972 3.6 0.2
1973 7.7 -11.0
1974 -10.6 -15.8
1975 33.1 9.7
1976 4.2 6.5
1977 1.1 -4.8
1978 -9.7 -6.5
1979 11.2 9.7
1980 15.6 -5.2
1981 -16.5 -15.6
1982 -6.7 -1.1
1983 9.8 6.3
1984 6.2 -15.9
1985 -0.3 -8.4

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