Response of Nesting Ducks to Predator Exclosures and Water Conditions
During Drought
Figures
 |
|
Fig. 1. Breeding populations of 5 duck species, number of
May ponds, and area of May ponds on study areas in North Dakota (Kulm,
Jamestown) and Minnesota (Detroit Lakes), 1987-91. |
|
| Fig. 2. Comparison of regression ratio estimates with land-area
and water-area ratio estimates of breeding pairs of 5 duck species
on study areas in North Dakota (Kulm, Jamestown) and Minnesota (Detroit
Lakes), 1987-91. Each sample point represents an estimate for a species,
study area, and year. Solid lines are expected results if estimators
exhibit the same bias. Dashed lines were fit by simple linear regression. |
 |
| Fig. 3. Changes in proportion of ducks nesting within exclosures
on study areas in North Dakota (Kulm, Jamestown) and Minnesota (Detroit
Lakes), 1987-91. |
