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. 2019 Oct 29;9:15477. doi: 10.1038/s41598-019-51222-9

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Histograms of recorded noise levels during presence of different vessel types. Subplots show recorded noise in third-octave bands centred at (a) 0.125 kHz, (b) 2 kHz and (c) 16 kHz. Colours represent times with only AIS vessels present (dark blue), both AIS and non-AIS vessels present (light blue), only non-AIS vessels present with at least one being motorised (dark green), only non-AIS sailboats present (light green) or no vessels present (grey). The x-axis shows the proportion of the time (%) that each third-octave band level (1 dB intervals from 60 to 130 dB re 1µPa, RMS) occurs within each group. Ambient noise (5^th percentile) is plotted as dashed horizontal lines.