Low-frequency signals produced by Northeast Atlantic killer whales (Orcinus orca)

Samarra, Filipa I.P., Deecke, Volker B. and Miller, Patrick J.O. (2016) Low-frequency signals produced by Northeast Atlantic killer whales (Orcinus orca). Journal of the Acoustical Society of America, 139 (3). pp. 1149-1157.

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Official URL: http://dx.doi.org/10.1121/1.4943555

Abstract

Killer whale acoustic behavior has been extensively investigated, however most studies have focused on pulsed calls and whistles. This study reports the production of low-frequency signals by killer whales at frequencies below 300 Hz. Recordings of killer whales were made in Iceland and Norway when whales were observed feeding on herring, and no other cetacean species were nearby. Low-frequency sounds were identified in Iceland and ranged in duration between 0.14 and 2.77 seconds and in frequency between 50 and 270 Hz, well below the previously reported lower limit for killer whale tonal sounds of 500 Hz. LFS appeared to be produced close in time to tail slaps, indicative of feeding attempts, suggesting that these sounds may be related to a feeding context. However, their precise function is unknown and they could be the by-product of a non-vocal behavior, rather than a vocal signal deliberately produced by the whales. Although killer whales in Norway exhibit similar feeding behavior, this sound was not detected in recordings from Norway. This study suggests that, like other delphinids, killer whales also produce low-frequency sounds but further studies will be required to understand whether similar sounds exist in other killer whale populations.

Item Type: Article
Journal or Publication Title: Journal of the Acoustical Society of America
Publisher: Acoustical Society of America
ISSN: 1520-8524
Departments: Centre for Wildlife Conservation
Faculty of Health and Science > Science, Natural Resources and Outdoor Studies > Forestry, Conservation & Applied Science
Additional Information: Copyright 2016 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in J. Acoust. Soc. Am. Vol. 139 (3) p. 1149 (2016)
Depositing User: Volker Deecke
Date Deposited: 14 Mar 2016 11:18
Last Modified: 22 Mar 2017 18:47
URI: http://insight.cumbria.ac.uk/id/eprint/2067

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