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. 2016 Jan 27;3(1):150686. doi: 10.1098/rsos.150686

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© 2016 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 4. — Eel anti-predator responses during ambient-noise playback following another ambient-noise playback (control treatment), ship-noise playback following ambient-noise playback (additional-noise treatment) and ambient-noise playback following ship-noise playback (post-additional noise treatment). (a) Number of individuals exhibiting a startle response or not to a looming stimulus (n=65 per treatment). (b) Time taken to startle to the looming stimulus for the eels that exhibited a startle response; shown are mean±s.e. Control treatment n=38, additional-noise treatment: n=16, post-additional noise treatment: n=33. Asterisks (* and **) denote p<0.05 and p<0.01, respectively.