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dc.contributor.authorJensen, Frants H.
dc.contributor.authorBejder, Lars
dc.contributor.authorWahlberg, Magnus
dc.contributor.authorAguilar De Soto, Natacha
dc.contributor.authorJohnson, Mark P.
dc.contributor.authorMadsen, Peter T.
dc.date.accessioned2011-05-04T14:51:16Z
dc.date.available2011-05-04T14:51:16Z
dc.date.issued2009-12-03
dc.identifier.citationMarine Ecology Progress Series 395 (2009): 161-175en_US
dc.identifier.urihttp://hdl.handle.net/1912/4542
dc.descriptionAuthor Posting. © Inter-Research, 2009. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 395 (2009): 161-175, doi:10.3354/meps08204.en_US
dc.description.abstractIncreasing numbers and speeds of vessels in areas with populations of cetaceans may have the cumulative effect of reducing habitat quality by increasing the underwater noise level. Here, we first use digital acoustic tags to demonstrate that free-ranging delphinids in a coastal deep-water habitat are subjected to varying and occasionally intense levels of vessel noise. Vessel noise and sound propagation measurements from a shallow-water habitat are then used to model the potential impact of high sound levels from small vessels on delphinid communication in both shallow and deep habitats, with bottlenose dolphins Tursiops sp. and short-finned pilot whales Globicephala macrorhynchus as model organisms. We find that small vessels travelling at 5 knots in shallow water can reduce the communication range of bottlenose dolphins within 50 m by 26%. Pilot whales in a quieter deep-water habitat could suffer a reduction in their communication range of 58% caused by a vessel at similar range and speed. Increased cavitation noise at higher speeds drastically increases the impact on the communication range. Gear shifts generate high-level transient sounds (peak– peak source levels of up to 200 dB re 1 µPa) that may be audible over many kilometres and may disturb close-range animals. We conclude that noise from small vessels can significantly mask acoustically mediated communication in delphinids and contribute to the documented negative impacts on animal fitness.en_US
dc.description.sponsorshipThis work was supported by the PhD School of Aquatic Sciences (SOAS), Aarhus University, DK, WWF Verdensnaturfonden and Aase & Ejnar Danielsens Foundation, the Siemens Foundation, a research agreement between La Laguna University and Woods Hole Oceanographic Institution, the Faculty of Science at the University of Aarhus, Denmark, and the Danish Natural Science Foundation via a Steno scholarship and frame grants to P.T.M. M.J. and N.A. were funded by the National Oceanographic Partnership Program.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoenen_US
dc.publisherInter-Researchen_US
dc.relation.urihttps://doi.org/10.3354/meps08204
dc.subjectAcoustic communicationen_US
dc.subjectVessel noiseen_US
dc.subjectMaskingen_US
dc.subjectBottlenose dolphinsen_US
dc.subjectPilot whalesen_US
dc.subjectRecreational vesselsen_US
dc.subjectWhale watchingen_US
dc.titleVessel noise effects on delphinid communicationen_US
dc.typeArticleen_US
dc.identifier.doi10.3354/meps08204


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