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

Nielsen, ML.K., Bejder, L., Videsen, S.K.A., Christiansen, F. and Madsen, P.T. (2019) Acoustic crypsis in southern right whale mother–calf pairs: infrequent, low-output calls to avoid predation? The Journal of Experimental Biology, 222 (13).

Link to Published Version: https://doi.org/10.1242/jeb.190728
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Abstract

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.

Item Type: Journal Article
Murdoch Affiliation: Harry Butler Institute
School of Veterinary and Life Sciences
Centre for Sustainable Aquatic Ecosystems
Journal or Publication Title: The Journal of Experimental Biology
Publisher: Company of Biologists
Copyright: © 2019 The Company of Biologists Ltd
URI: http://researchrepository.murdoch.edu.au/id/eprint/49906
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