Department of Biology

Aarhus University Seal / Aarhus Universitets segl

Professor Peter Teglberg Madsen

Acoustic crypsis in southern right whale mother-calf pairs: infrequent, low-output calls to avoid predation?

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

  • Mia L.K. Nielsen
  • ,
  • Lars Bejder, Hawaii Institute of Marine Biology, University of Hawaii, Murdoch University
  • ,
  • Simone K.A. Videsen
  • Fredrik Christiansen, Murdoch University
  • ,
  • Peter T. Madsen

Southern right whales (Eubalaena australis) invest substantial amounts of energy in their calves, while facing the risk of having them predated upon by eavesdropping killer whales (Orcinus orca). We tested the hypothesis that southern right whale mother-calf pairs employ acoustic crypsis to reduce acoustic detectability by such predators. Specifically, we deployed multi-sensor DTAGs on nine lactating whales for a total of 62.9 h in a Western Australian breeding ground, and used a SoundTrap to estimate the concomitant acoustic background noise. Vocalisations were recorded at low rates of <10 calls h-1 (1 call per dive) and at low received levels between 123±8 and 134±10 dB re. 1 µPa RMS depending on call type. We conclude that such acoustic crypsis in southern right whales and other baleen whales decreases the risk of alerting potential predators and hence jeopardizing a substantial energetic investment by the mother.

Original languageEnglish
Article numberjeb190728
JournalThe Journal of Experimental Biology
Volume222
ISSN0022-0949
DOIs
Publication statusPublished - 11 Jul 2019

    Research areas

  • Acoustic communication, Ambient noise, Australia, Baleen whales, Maternal investment

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