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Theoretical approach to estimating the induction of hearing impairment in bottlenose dolphins by radiated leisure boat noise

Published online by Cambridge University Press:  30 August 2011

Jonathan A. David
Jonathan A. David*
Affiliation:
School of Biology, University of St Andrews, Scottish Oceans Institute, St Andrews, Fife, UK
*
Correspondence should be addressed to: J.A. David, School of Biology, University of St Andrews, Scottish Oceans Institute, St Andrews, Fife, UK email: [email protected]
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Abstract

Coastal waters are being subjected to underwater noise generated by increasing numbers of leisure and tour boats. Such noise has the potential to impair the hearing of neighbouring bottlenose dolphins, particularly as the noise from several distributed boats could summate at the point of reception. This potential has been assessed by comparing small boat noise, recorded over a range of 8–532 m, with noise that is known to induce hearing impairment in the form of a temporary threshold shift (TTS) or permanent threshold shift (PTS). Extrapolation of broadband boat noise levels yielded a minimum source sound pressure level of 156 dB re 1μPa at 1 m. An equal-energy model for TTS-onset predicted that boat noise could induce a TTS after 1 hour's exposure at 1.3 m and after 8 hours' exposure at 2.3 m. These distances increased with additional adjacent boats. Leisure boats are unlikely to induce a PTS, even at close range.

Keywords

hearingthreshold shiftboatdolphin noisetemporary threshold shift (TTS)permanent threshold shift (PTS)
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 8: Marine Mammals , December 2012 , pp. 1887 - 1892
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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