Fig. 5.

Predicted effect of sea-surface salinity on harbour porpoise movement speed (a), turning angle (b), dive duration (c), dive wiggliness (d), and post-dive duration (e). Predictions were made while keeping other variables in the full model constant at their mean value. Black lines show the back-transformed (from log₁₀ scale) predicted marginal (population-level) effect with shaded areas indicating the 95% CI around the mean, and coloured points show raw data values for each porpoise. Note that ID 6 could not be shown on panels c–e due to missing dive data