Range-dependent flexibility in the acoustic field of view of echolocatingporpoises (Phocoena phocoena): Short title: Flexible field of view in echolocating porpoises

Danuta M. Wisniewska*, John M. Ratcliffe, Kristian Beedholm, Christian B. Christensen, Mark Johnson, Jens C. Koblitz, Magnus Wahlberg, Peter T. Madsen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Toothed whales use sonar to detect, locate, and track prey. They adjust emitted sound intensity, auditory sensitivity and click rate to target range, and terminate prey pursuits with high28 etition-rate, low-intensity buzzes. However, their narrow acoustic field of view (FOV) is considered stable throughout target approach, which could facilitate prey escape at close-range. Here we show that, like some bats, harbour porpoises can broaden their biosonar beam during the terminal phase of attack but, unlike bats, maintain the ability to change beamwidth within this phase. Based on video, MRI, and acoustic-tag recordings, we propose this flexibility is modulated by the melon and implemented to accommodate dynamic spatial relationships with prey and acoustic complexity of surroundings. Despite independent evolution and different means of sound generation and transmission, whales and bats adaptively change their FOV, suggesting that beamwidth flexibility has been an important driver in the evolution of echolocation for prey tracking.

Original languageEnglish
Pages (from-to)1-29
Number of pages29
JournaleLife
Volume2015
Issue number4
DOIs
StatePublished - 20 Mar 2015
Externally publishedYes

Keywords

  • Beam
  • Biosonar
  • Buzz
  • Convergent evolution
  • Directionality
  • Prey capture

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