Vessel noise effects on delphinid communication
Jensen, Frants H.
Aguilar De Soto, Natacha
Johnson, Mark P.
Madsen, Peter T.
MetadataShow full item record
KeywordAcoustic communication; Vessel noise; Masking; Bottlenose dolphins; Pilot whales; Recreational vessels; Whale watching
Increasing 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.
Author 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.
Suggested CitationArticle: Jensen, Frants H., Bejder, Lars, Wahlberg, Magnus, Aguilar De Soto, Natacha, Johnson, Mark P., Madsen, Peter T., "Vessel noise effects on delphinid communication", Marine Ecology Progress Series 395 (2009): 161-175, DOI:10.3354/meps08204, https://hdl.handle.net/1912/4542
Showing items related by title, author, creator and subject.
Parks, Susan E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-09)The focus of this thesis is the use of sound for communication by the North Atlantic right whale (Eubalaena glacialis). The surface active group (SAG) is the predominant social interaction in this species for which use ...
Absolute probability estimates of lethal vessel strikes to North Atlantic right whales in Roseway Basin, Scotian Shelf van der Hoop, Julie; Vanderlaan, Angelia S. M.; Taggart, Christopher T. (Ecological Society of America, 2012-10)Vessel strikes are the primary source of known mortality for the endangered North Atlantic right whale (Eubalaena glacialis). Multi-institutional efforts to reduce mortality associated with vessel strikes include vessel-routing ...
van der Hoop, Julie; Vanderlaan, Angelia S. M.; Cole, Timothy V. N.; Henry, Allison G.; Hall, Lanni; Mase-Guthrie, Blair; Wimmer, Tonya; Moore, Michael J. (John WIley & Sons, 2014-05-01)To determine effectiveness of Seasonal Management Areas (SMAs), introduced in 2008 on the U.S. East Coast to reduce lethal vessel strikes to North Atlantic right whales, we analyzed observed large whale mortality events ...