Amazon river dolphins (Inia geoffrensis ) modify biosonar output level and directivity during prey interception in the wild

The Journal of Experimental Biology
Michael LadegaardP T Madsen

Abstract

Toothed whales have evolved to live in extremely different habitats and yet they all rely strongly on echolocation for finding and catching prey. Such biosonar-based foraging involves distinct phases of searching for, approaching and capturing prey, where echolocating animals gradually adjust sonar output to actively shape the flow of sensory information. Measuring those outputs in absolute levels requires hydrophone arrays centred on the biosonar beam axis, but this has never been done for wild toothed whales approaching and capturing prey. Rather, field studies make the assumption that toothed whales will adjust their biosonar in the same manner to arrays as they will when approaching prey. To test this assumption, we recorded wild botos (Inia geoffrensis) as they approached and captured dead fish tethered to a hydrophone in front of a star-shaped seven-hydrophone array. We demonstrate that botos gradually decrease interclick intervals and output levels during prey approaches, using stronger adjustment magnitudes than predicted from previous boto array data. Prey interceptions are characterised by high click rates, but although botos buzz during prey capture, they do so at lower click rates than marine toothed whales, resulti...Continue Reading

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Citations

Nov 28, 2018·The Journal of Experimental Biology·Michael LadegaardJames J Finneran
Jul 28, 2019·The Journal of Experimental Biology·Michael Ladegaard, Peter Teglberg Madsen
Jul 1, 2019·The Journal of the Acoustical Society of America·Adam B SmithLeo J A Suarez
May 3, 2018·The Journal of the Acoustical Society of America·Mafalda de FreitasPeter T Madsen
Jul 1, 2019·The Journal of the Acoustical Society of America·Zining GongSonghai Li
Apr 9, 2020·PLoS Computational Biology·Lara S Burchardt, Mirjam Knörnschild
Dec 10, 2017·The Journal of Experimental Biology·Lasse JakobsenAnders Hedenström
Jul 3, 2020·The Journal of the Acoustical Society of America·Jamie D J MacaulayPeter T Madsen
Nov 26, 2020·The Journal of Experimental Biology·Daniel Lewanzik, Holger R Goerlitz
Jan 31, 2021·The Journal of the Acoustical Society of America·Kristian BeedholmPeter Teglberg Madsen
Mar 27, 2021·The Journal of the Acoustical Society of America·M B PedersenP T Madsen
May 5, 2021·The Journal of the Acoustical Society of America·A M von Benda-BeckmannP J O Miller

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