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ESR 31:89-102 (2016)  -  DOI:

Biological significance of sperm whale responses to sonar: comparison with anti-predator responses

Charlotte Curé1,*, Saana Isojunno2, Fleur Visser3,4, Paul J. Wensveen2, Lise D. Sivle5, Petter H. Kvadsheim6, Frans-Peter A. Lam7, Patrick J. O. Miller2

1CEREMA - DTer Est, Acoustics Group, 67035 Strasbourg Cedex 2, France
2Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife KY16 8LB, UK
3Kelp Marine Research, 1624 CJ, Hoorn, The Netherlands
4Behavioural Biology Group, Leiden University, 2300 RA, Leiden, The Netherlands
5Institute of Marine Research, 5005 Bergen, Norway
6Norwegian Defence Research Establishment (FFI), 3191 Horten, Norway
7Netherlands Organization for Applied Scientific Research (TNO), 2597 AK, The Hague, The Netherlands
*Corresponding author:

ABSTRACT: A key issue when investigating effects of anthropogenic noise on cetacean behavior is to identify the biological significance of the responses. Predator presence can be considered a natural high-level disturbance stimulus to which prey animals have evolved adaptive response strategies to reduce their risk of predation by altering behavior away from fitness-enhancing activities such as foraging. By contrasting the type and magnitude (duration, severity, consistency) of behavioral responses to anthropogenic noise and playback of killer whale (KW) sounds that simulated predator presence, this study aimed to provide a relative index of the disturbance level as an indication of the biological significance of responses to the anthropogenic stimulus. Using multi-sensor tags as well as visual observations of surface behavior of adult male sperm whales, we assessed a comprehensive range of behavioral metrics that could reduce individuals’ fitness if altered for a biologically relevant duration. Combining previously published results and new analyses, we showed that the responses to 1-2 kHz upsweep naval sonar and to KW playback were very similar, including horizontal avoidance, interruption of foraging or resting activities and an increase in social sound production. However, only KW playbacks elicited grouping behaviors, indicating that this social response component was specific to predator detection. Animals responded to a lesser extent to 6-7 kHz upsweep naval sonar, indicating weaker disturbance effects. Our study demonstrates the benefit of using anti-predator responses as a reference of disturbance when evaluating the relative impacts of anthropogenic stimuli, which can be of particular interest in studies of threatened species such as sperm whales.

KEY WORDS: Sperm whales · Behavioral responses · Naval sonar · Anti-predator responses∙· Anthropogenic disturbance

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Cite this article as: Curé C, Isojunno S, Visser F, Wensveen PJ and others (2016) Biological significance of sperm whale responses to sonar: comparison with anti-predator responses. Endang Species Res 31:89-102.

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