The Relationship between Vessel Traffic and Noise Levels Received by Killer Whales (Orcinus orca)
Fig 5
Noise levels and average vessel speed.
Received noise levels (dB re 1 μPa) increased significantly with the average vessel speed per interval (F 1, 55 = 6.704, p = 0.012). There was substantial variation in vessel speed per interval, although no intervals had on average a vessel speed of “Very Fast 7+ knots”.