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Diving apart together: call propagation in diving long-finned pilot whales

Research output: Contribution to journalArticlepeer-review

DOI

Open Access Status

  • Embargoed (until 27/05/21)

Author(s)

Annebelle C.M. Kok, Lisette van Kolfshoten, James A. Campbell, Alexander M. von Benda-Beckmann, Patrick J.O. Miller, Hans Slabbekoorn, Fleur Visser

School/Research organisations

Abstract

Group-living animals must communicate to stay in contact. In long-finned pilot whales, there is a trade-off between the benefits of foraging individually at depth and the formation of tight social groups at the surface. Using theoretical modelling and empirical data of tagged pairs within a group, we examined the potential of pilot whale social calls to reach dispersed group members during foraging periods. Both theoretical predictions and empirical data of tag pairs showed a potential for communication between diving and non-diving group members over separation distances up to 385 m (empirical) and 1800 m (theoretical). These distances match or exceed pilot whale dive depths recorded across populations. Call characteristics and environmental characteristics were analysed to investigate determinants of call detectability. Longer calls with a higher sound pressure level (SPL) that were received in a quieter environment were more often detected than their shorter, lower SPL counterparts within a noisier environment. In a noisier environment, calls were louder and had a lower peak frequency, indicating mechanisms for coping with varying conditions. However, the vulnerability of pilot whales to anthropogenic noise is still of concern as the ability to cope with increasing background noise may be limited. Our study shows that combining propagation modelling and actual tag recordings provides new insights into the communicative potential for social calls in orientation and reunion with group members for deep-diving pilot whales.

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Details

Original languageEnglish
Article numberjeb207878
Number of pages11
JournalJournal of Experimental Biology
Volume223
Issue number10
DOIs
Publication statusPublished - 27 May 2020

    Research areas

  • Active space, Communication, Contact call, Globicephala melas, Noise, Odontocete

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