For The Wild

IN THE COMPANY OF HUMPBACKS S1:E1

Mar 26, 2026
Joe Olson, an underwater acoustics and hydrophone expert, and Dr. Fred Sharpe, a veteran marine biologist studying humpback foraging and aerial sounds, explore whale sound analysis. They discuss bassy thrums, matching air and underwater recordings, whether thrums are communication or maintenance sounds, playback ethics and outcomes, and how sound study informs conservation.
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INSIGHT

Matching Air Thrums To Underwater Signals

  • Thrums detected in air can be matched to faint underwater components using spectrograms.
  • Joe Olson found water spectrogram matches that preceded the air sound by ~1.2 seconds, allowing rough distance estimates from hydrophone-to-microphone timing.
INSIGHT

Why Thrums Might Not Be Communication

  • Thrums may not be long-range communication because they lack strong underwater power and clear call-and-response patterns.
  • Fred Sharpe notes sound transmission across the air-water interface is poor and thrums often appear incidental to breathing, arguing against a classic sender-receiver communication role.
INSIGHT

Thrums As Maintenance Or Emotional Signals

  • Thrums could be maintenance or emotional-state sounds rather than directed signals.
  • Fred and Joe discuss thrums produced by a 'raspberry-type puckering of the blowhole' tied to breathing and potentially signaling contentment or satiation.
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