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Northern bottlenose whales in a pristine environment respond strongly to close and distant navy sonar signals

Research output: Contribution to journalArticle

Author(s)

Paul J. Wensveen, Saana Isojunno, Rune R. Hansen, Alexander M. Von Benda-beckmann, Lars Kleivane, Sander Van Ijsselmuide, Frans-peter A. Lam, Petter H. Kvadsheim, Stacy L. Deruiter, Charlotte Curé, Tomoko Narazaki, Peter L. Tyack, Patrick J. O. Miller

School/Research organisations

Abstract

Impact assessments for sonar operations typically use received sound levels to predict behavioural disturbance in marine mammals. However, there are indications that cetaceans may learn to associate exposures from distant sound sources with lower perceived risk. To investigate the roles of source distance and received level in an area without frequent sonar activity, we conducted multi-scale controlled exposure experiments (n = 3) with 12 northern bottlenose whales near Jan Mayen, Norway. Animals were tagged with high-resolution archival tags (n = 1 per experiment) or medium-resolution satellite tags (n = 9 in total) and subsequently exposed to sonar. We also deployed bottom-moored recorders to acoustically monitor for whales in the exposed area. Tagged whales initiated avoidance of the sound source over a wide range of distances (0.8–28 km), with responses characteristic of beaked whales. Both onset and intensity of response were better predicted by received sound pressure level (SPL) than by source distance. Avoidance threshold SPLs estimated for each whale ranged from 117–126 dB re 1 µPa, comparable to those of other tagged beaked whales. In this pristine underwater acoustic environment, we found no indication that the source distances tested in our experiments modulated the behavioural effects of sonar, as has been suggested for locations where whales are frequently exposed to sonar.
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Details

Original languageEnglish
Article number20182592
Number of pages10
JournalProceedings of the Royal Society B: Biological Sciences
Volume286
Issue number1899
DOIs
Publication statusPublished - 20 Mar 2019

    Research areas

  • Hyperoodon ampullatus, Military sonar, Cetacean, Marine mammal, Disturbance

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