Assessing vessel slowdown for reducing auditory masking for marine mammals and fish of the western Canadian Arctic

Last modified: 
January 15, 2019 - 3:21pm
Type: Journal Article
Year of publication: 2018
Date published: 10/2018
Authors: Matthew Pine, David Hannay, Stephen Insley, William Halliday, Francis Juanes
Journal title: Marine Pollution Bulletin
Volume: 135
Pages: 290 - 302
ISSN: 0025326X

Vessel slowdown may be an alternative mitigation option in regions where re-routing shipping corridors to avoid important marine mammal habitat is not possible. We investigated the potential relief in masking in marine mammals and fish from a 10 knot speed reduction of container and cruise ships. The mitigation effect from slower vessels was not equal between ambient sound conditions, species or vessel-type. Under quiet ambient conditions, a speed reduction from 25 to 15 knots resulted in smaller listening space reductions by 16–23%, 10–18%, 1–2%, 5–8% and 8% respectively for belugas, bowheads, bearded seals, ringed seals, and fish, depending on vessel-type. However, under noisy conditions, those savings were between 9 and 19% more, depending on the species. This was due to the differences in species' hearing sensitivities and the low ambient sound levels measured in the study region. Vessel slowdown could be an effective mitigation strategy for reducing masking.

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