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Determining the behavioural dose-response relationship of marine mammals to air gun noise and source proximity

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Rebecca A. Dunlop, Michael J. Noad, Robert D. McCauley, Lindesay Alexandra Sarah Scott-Hayward, Eric Kniest, Robert Slade, David Paton, Douglas H. Cato

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Abstract

The effect of various anthropogenic sources of noise (e.g. sonar, seismic surveys) on the behaviour of marine mammals is sometimes quantified as a dosetextendashresponse relationship, where the probability of an animal behaviourally 'responding' (e.g. avoiding the source) increases with 'dose' (or received level of noise). To do this, however, requires a definition of a 'significant' response (avoidance), which can be difficult to quantify. There is also the potential that the animal 'avoids' not only the source of noise but also the vessel operating the source, complicating the relationship. The proximity of the source is an important variable to consider in the response, yet difficult to account for given that received level and proximity are highly correlated. This study used the behavioural response of humpback whales to noise from two different air gun arrays (20 and 140 cubic inch air gun array) to determine whether a dosetextendashresponse relationship existed. To do this, a measure of avoidance of the source was developed, and the magnitude (rather than probability) of this response was tested against dose. The proximity to the source, and the vessel itself, was included within the one-analysis model. Humpback whales were more likely to avoid the air gun arrays (but not the controls) within 3 km of the source at levels over 140 re. 1 μPa2 s-1, meaning that both the proximity and the received level were important factors and the relationship between dose (received level) and response is not a simple one.
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Original languageEnglish
Pages (from-to)2878-2886
Number of pages9
JournalJournal of Experimental Biology
Volume220
Issue number16
DOIs
Publication statusPublished - 16 Aug 2017

    Research areas

  • Anthropogenic noise, Behavioural response study, Received level, Humpback whale, Seismic air gun

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