The relative importance of independent variables in the final binomial model.

The sum of squares for each variable are reported for the final model. The variables were added one at a time until all were included, using the lowest AIC so that the best model was maintained at all times. Variables that reduced the model by at least 2 AIC (in addition to the first variable added) are highlighted in bold. No interactions were found to improve the full model through forward selection. Each variable has one degree of freedom. The final model had residual 415 degrees of freedom. BW Temp is the 25-day (five 5-day periods) running mean in the bottom temperature of the Western box (see Figure 3). W-E Temp is the difference in the temperature of the bottom waters between the Western and Easter boxes (see Figure 3). Navy is the presence-absence of naval activity, with “No Known Activity” as the base category.