Table 4.
Comparisons of linear model performances of the migration variables with and without size as a covariate in terms of difference in AIC values (ΔAIC)
| Explanatory variables | ΔAIC | |
|---|---|---|
| (i) Migration speed | ||
| Traditional | ~ 1 | 8.5 |
| ~ 1+ size | 0 | |
| Partial | ~ 1 | 21.3 |
| ~ 1+ size | 0 | |
| (ii) Number of staging sites | ~ 1 | 1.0 |
| ~ 1+ size | 0 | |
| (iii) Total migration distance | ~ 1 | 10.6 |
| ~ size | 0 | |
| (iv) Maximum step length | ~ 1 | 14.7 |
| ~ 1+ size | 0 | |
In all cases a ΔAIC of 0 defines the best model. ΔAIC of alternative models that are >2 suggest that these alternative models are performing worse than the model with a ΔAIC equalling 0