Effect of acoustic deterrents on the behaviour of common dolphins (Delphinus delphis)

Main Article Content

Simon Berrow
Ronan Cosgrove
Ruth H. Leeney
Joanne O'Brien
David McGrath
Jeppe Dalgard
Yves Le Gall

Abstract

Not all delphinids are similarly affected by acoustic deterrent devices (pingers). At-sea trials were carried out to assess a range of acoustic signals and deterrents on the behaviour of common dolphins. In initial tests two acoustic deterrent devices, which previously produced an evasive response by bottlenose dolphins, failed to elicit any similar behaviour in common dolphins. A new signal output device, which permitted a range of signals to be tested at various source levels and characteristics was subsequently developed but again no significant effects on the behaviour of common dolphins were observed. Two commercially available acoustic deterrents, which had deterred common dolphins in previous studies, produced an occasional mild evasive response. Significant modification of the signal type or source level may be more effective, but our results suggest that pingers, at their current state of development, may not provide a consistently effective deterrent signal for common dolphins.

Article Details

Section
Articles

Most read articles by the same author(s)