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Updated: May 24, 2026

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Sonar-induced pressure fields in a post-mortem common dolphin.

Kenneth G Foote1, Mardi C Hastings, Darlene R Ketten

  • 1Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA. kfoote@whoi.edu

The Journal of the Acoustical Society of America
|February 23, 2012
PubMed
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This study measured acoustic pressure fields in a dolphin cadaver exposed to sonar signals. No physical damage was observed, suggesting low risk from these specific sonar transmissions to marine mammals.

Area of Science:

  • Marine Biology
  • Acoustics
  • Bioacoustics

Background:

  • Marine mammals face potential risks from anthropogenic noise, particularly sonar.
  • Understanding the physical effects of sonar on marine mammal tissues is crucial for conservation.

Purpose of the Study:

  • To investigate the potential physical effects of sonar transmissions on marine mammal tissues.
  • To measure acoustic pressure fields induced within a common dolphin cadaver exposed to sonar.

Main Methods:

  • A young adult male common dolphin (Delphinus delphis) cadaver was instrumented with acoustic pressure gauges.
  • Computerized tomography (CT) guided gauge implantation near critical tissues (melon, nares, ear, lungs, etc.).
  • The specimen was exposed to pulsed sinusoidal sonar signals (5, 7, and 10 kHz) via a spherical transducer.

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Main Results:

  • Quantitative internal pressure fields were successfully recorded in most instrumented locations.
  • No acoustic lesions were identified during the necropsy of instrumented areas and major organs.
  • Findings were consistent with the low acoustic source level and proximity used in the experiment.

Conclusions:

  • The study found no physical lesions attributable to the tested sonar transmissions in the dolphin cadaver.
  • Results suggest that at the tested levels and distances, sonar may pose a low physical risk to marine mammals.
  • Further research could explore effects at higher intensities and different frequencies.