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Related Concept Videos

Echo01:06

Echo

505
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
505

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Common dolphin whistle responses to experimental mid-frequency sonar.

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Common dolphins show immediate and significant changes in whistle rates after exposure to mid-frequency active sonar (MFAS). These acoustic responses persist through repeated exposures, indicating potential impacts on marine mammal communication.

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Area of Science:

  • Marine Mammal Behavior
  • Bioacoustics
  • Anthropogenic Ocean Noise

Background:

  • Oceanic delphinids frequently encounter intense military sonar in Navy operational zones.
  • Measuring sonar's behavioral impact on social, free-ranging dolphins is difficult.
  • Baseline vocal behavior data is needed to assess anthropogenic disturbance effects.

Purpose of the Study:

  • To investigate the effects of mid-frequency active sonar (MFAS) on dolphin whistle production.
  • To analyze behavioral responses using varying temporal windows for acoustic analysis.
  • To understand common dolphin (Delphinus delphis) reactions to simulated sonar.

Main Methods:

  • Conducted controlled exposure experiments using a network of drifting acoustic buoys.
  • Simulated Navy mid-frequency active sonar (MFAS) at 3-4 kHz.
  • Analyzed whistle production in short-beaked and long-beaked common dolphins over temporal windows from 5 seconds to 10 minutes.

Main Results:

  • Common dolphins exhibited acute, pronounced changes in whistle rate within 5 seconds of MFAS exposure.
  • This whistle rate response was sustained across sequential MFAS exposures.
  • Detected brief, clearly measurable acoustic responses to MFAS, suggesting limited habituation.

Conclusions:

  • Common dolphins display detectable acoustic responses to mid-frequency active sonar.
  • Variable temporal analysis windows are crucial for detecting behavioral responses to sonar.
  • Future research should establish baseline vocal rates to inform analysis of marine mammal responses to disturbance.