Figure 1.
Map of British Columbia inshore waters identifying major waterways.
Figure 2.
Audiograms of marine mammal species occurring in British Columbia.
Figure 3.
Ship source spectra (1/3 octave band levels) for five vessel length classes (solid lines) in dB re 1 µPa @ 1 m.
Note that vessels <10 m length were louder than vessels up to 25 m length due to the faster mean speed of the shorter vessels. Received spectra at 30 km range in 50 m of water (dash-dot lines), in dB re 1 µPa. Marine mammal audiograms from Fig. 2 (black lines) in dB re 1 µPa.
Figure 4.
A measure of audible acoustic energy from all classes of ships over the summer of 2008 by species on a 5×5 km grid.
Figure 5.
Audibility map for Dall's porpoise (left), Dall's porpoise density map (middle) and resulting map of hotspots (right).
Figure 6.
Map of ship noise and animal hotspots for four odontocete species.
Figure 7.
Map of ship noise and animal hotspots for baleen whales and pinnipeds.
All color scales range from 0 (blue) to 1 (red), indicating least to highest risk.