Table 4. Model-averaged parameter estimates based on 12 general mixed linear models for nest success of dabbling ducks as a function of country, proportion cropland, pond density, and interactions in the North American Prairie Pothole Region between 1964 and 1995. SE refers to standard error, SD to standard deviation, and t = estimate/SE. Parameters in which t > 1.96 have 95% confidence intervals that do not include 0.
| |
| |
|
Parameter |
Estimate |
SE |
t |
| |
|
Fixed effects |
|
|
|
|
Intercept |
0.84 |
0.11 |
7.52 |
|
Country: Canada |
-0.37 |
0.12 |
-3.18 |
|
Proportion Cropland |
-0.49 |
0.17 |
-2.89 |
|
Proportion Cropland*Country Interaction (Canada) |
0.43 |
0.27 |
1.60 |
|
Pond Density |
-0.01 |
0.01 |
-1.82 |
|
Pond Density*Country Interaction (Canada) |
0.02 |
0.01 |
2.66 |
|
|
|
|
|
|
Random effects |
|
SD |
|
|
Site(Stratum) |
|
0.004 |
|
|
Year |
|
0.001 |
|
|
Residual |
|
0.019 |
|
|
|
|
|
|
|
| |
|