Figure 6.
Presence of different vessel groups (colours) at the time of noise events expected to elicit behavioural responses in harbour porpoises. Response thresholds are based on results from three published studies; (a) Dyndo et al.41, (b) Tougaard et al.43 and (c) Wisniewska et al.35. For each threshold the total percentage of events correlating with presence of AIS vessels (orange) and non-AIS vessels (yellow) are also shown, with an overlap due to cases where both AIS and non-AIS vessels are present (light blue). The number of high noise events (N) exceeding each specific threshold is shown at the bottom.