Likely Sensitivity of Bottlenose Dolphins to Pile-Driving Noise

Journal Article

Title: Likely Sensitivity of Bottlenose Dolphins to Pile-Driving Noise
Authors: David, J.
Publication Date:
January 25, 2006
Journal: Water and Environmental Journal
Volume: 20
Pages: 48-54

Document Access

Website: External Link


David, J. (2006). Likely Sensitivity of Bottlenose Dolphins to Pile-Driving Noise. Water and Environmental Journal, 20, 48-54.

Pile driver-generated noise has the potential to affect dolphin populations adversely as it is detectable up to 40km from the source. At 9 kHz, this noise is capable of masking strong vocalisations within 10–15km and weak vocalisations up to approximately 40 km. The masking radius reduces as the frequency increases: 6 km at 50 kHz and 1.2km at 115 kHz. The impacts of masking are expected to be limited by the intermittent nature of pile driver noise, the dolphin’s directional hearing, their ability to adjust vocalisation amplitude and frequency, and the structured content of their signals. Behavioural modifications have been observed in response to underwater sounds, including those produced by pile drivers, although in the latter case this may have been due to redistribution of prey species. A range of mitigation measures are proposed that are aimed at reducing the impact of pile driver noise on dolphin populations.

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