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August 13, 2025

Underwater audiogram of the grey seal (Halichoerus grypus).

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Authors

ARAndreas RuserKHKirstin Anderson HansenMWMagnus Wahlberg

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Overview

Psychophysical methods measured hearing sensitivity in grey seals, indicating low-frequency hearing impacts vulnerability to noise.

Key Points

  • MAIN FINDING: Grey seals have best hearing sensitivity at 4 kHz, with notable low-frequency advantages.
  • KEY EVIDENCE: Hearing thresholds below 4 kHz differed, showing lower sensitivity predicted by standard phocid models.
  • APPROACH: Two grey seals were tested using a psychophysical staircase method across frequencies from 0.125 to 64 kHz.
  • SIGNIFICANCE: Findings suggest a need to revise phocid audiogram standards for assessing noise impact on marine mammals.

Cite This Study

Ruser et al. (2025) studied this question.

synapsesocial.com/papers/689e03efd61984b91e13d5a5https://doi.org/10.1242/bio.062059
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