Appendix F. AICc differences (Δi) and AICc weights (wi) for three growth models fit to population time series for 10 duck species (1955–2004). Models were fit to 1955–1979 (period 1) and 1980–2004 (period 2) time series separately. AICc weights are in parentheses.
Species |
Time Period |
Density-Independent (linear) |
Density-dependent (linear) |
Density-dependent (curvilinear) |
Mallard |
1 |
1.994 (0.221) |
0.000 (0.597) |
2.366 (0.183) |
Mallard |
2 |
0.000 (0.502) |
0.529 (0.385) |
2.984 (0.112) |
Gadwall |
1 |
1.261 (0.213) |
0.066 (0.387) |
0.000 (0.400) |
Gadwall |
2 |
0.000 (0.536) |
0.724 (0.373) |
3.552 (0.091) |
American Wigeon |
1 |
4.008 (0.098) |
0.000 (0.727) |
2.847 (0.175) |
American Wigeon |
2 |
6.873 (0.025) |
0.000 (0.781) |
2.785 (0.194) |
Green-winged Teal |
1 |
10.155 (0.005) |
0.000 (0.775) |
2.522 (0.220) |
Green-winged Teal |
2 |
0.938 (0.334) |
0.000 (0.534) |
2.788 (0.132) |
Blue-winged Teal |
1 |
5.484 (0.064) |
0.000 (0.692) |
1.932 (0.263) |
Blue-winged Teal |
2 |
0.866 (0.297) |
0.000 (0.458) |
1.249 (0.245) |
Northern Shoveler |
1 |
6.761 (0.024) |
0.000 (0.705) |
1.907 (0.271) |
Northern Shoveler |
2 |
0.004 (0.370) |
0.000 (0.371) |
0.724 (0.258) |
Northern Pintail |
1 |
4.353 (0.061) |
0.000 (0.540) |
0.608 (0.399) |
Northern Pintail |
2 |
7.091 (0.020) |
0.000 (0.708) |
1.912 (0.272) |
Redhead |
1 |
4.997 (0.060) |
0.000 (0.733) |
2.532 (0.207) |
Redhead |
2 |
0.000 (0.444) |
0.240 (0.393) |
2.003 (0.163) |
Canvasback |
1 |
13.336 (0.001) |
0.000 (0.758) |
2.293 (0.241) |
Canvasback |
2 |
1.991 (0.218) |
0.000 (0.591) |
2.260 (0.191) |
Lesser Scaup |
1 |
7.260 (0.020) |
0.000 (0.742) |
2.270 (0.238) |
Lesser Scaup |
2 |
0.241 (0.415) |
0.000 (0.469) |
2.789 (0.116) |
Total ducks |
1 |
3.382 (0.107) |
0.000 (0.578) |
1.211 (0.315) |
Total ducks |
2 |
0.691 (0.352) |
0.000 (0.498) |
2.404 (0.150) |