Mid- to high-frequency noise from high-speed boats and its potential impacts on humpback dolphins

The Journal of the Acoustical Society of America
Songhai LiPeijun Zhang

Abstract

The impact of noise made by vessels on marine animals has come under increased concern. However, most measurements on noise from vessels have only taken into account the low-frequency components. For cetaceans operating in the mid- and high-frequencies, such as the Indo-Pacific humpback dolphin (Sousa chinensis), mid- to high-frequency noise components may be of more concern, in terms of their potential impacts. In this study, noise made by a small high-speed boat was recorded using a broadband recording system in a dolphin watching area focusing on the effects on humpback dolphins in Sanniang Bay, China. The high-speed boat produced substantial mid- to high-frequency noise components with frequencies to >100 kHz, measured at three speeds: ∼40, 30, and 15 km/h. The noise from the boat raised the ambient noise levels from ∼5 to 47 decibels (dB) root-mean-square (rms) across frequency bands ranging from 1 to 125 kHz at a distance of 20 to 85 m, with louder levels recorded at higher speeds and at closer distances. To conclude, the noise produced by the small high-speed boat could be heard by Sousa chinensis and therefore potentially had adverse effects on the dolphins.

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Citations

Oct 31, 2016·The Journal of the Acoustical Society of America·Lisa MungerSamuel K Hung
Dec 3, 2017·The Journal of the Acoustical Society of America·Mingming LiuSonghai Li
Jul 1, 2019·The Journal of the Acoustical Society of America·Lijun DongSonghai Li
May 10, 2018·The Journal of Experimental Biology·T Aran MooneyCaroline Goertz
Jul 3, 2020·The Journal of the Acoustical Society of America·Francesco CarusoSonghai Li
Aug 17, 2021·Marine Pollution Bulletin·Manuel VieiraM Clara P Amorim

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