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Evaluating temporary threshold shift onset levels for impulsive noise in seals.

Jillian M Sills1, Brandi Ruscher2, Ross Nichols2

  • 1Institute of Marine Sciences, Long Marine Laboratory, University of California Santa Cruz, Santa Cruz, California 95060, USA.

The Journal of the Acoustical Society of America
|December 2, 2020
PubMed
Summary

Seismic air gun noise caused temporary threshold shifts in bearded seal hearing after multiple exposures. This research informs predictions of noise impacts on marine mammal hearing.

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Area of Science:

  • Marine biology
  • Acoustic science
  • Animal behavior

Background:

  • Marine mammals face increasing underwater noise pollution.
  • Understanding auditory impacts of impulsive noise is crucial for conservation.
  • Previous studies explored noise effects on related species.

Purpose of the Study:

  • To evaluate the auditory effects of single and multiple seismic air gun noise exposures on bearded seals.
  • To measure hearing sensitivity changes and behavioral responses.
  • To establish thresholds for temporary threshold shift (TTS) in this species.

Main Methods:

  • Behavioral audiometry was used to assess hearing sensitivity before and after noise exposure.
  • Bearded seals were exposed to varying numbers of seismic air gun pulses.
  • Hearing was tested at 100 Hz and 400 Hz, with response time and bias also monitored.

Main Results:

  • Single seismic air gun shots did not cause temporary threshold shifts (TTS).
  • Four to ten consecutive pulses induced transient hearing threshold shifts at 400 Hz.
  • Auditory data, response times, and behavioral changes were recorded.

Conclusions:

  • Multiple impulsive noise exposures, not single events, can cause temporary hearing loss in bearded seals.
  • Findings contribute to predicting TTS onset in seals exposed to seismic activities.
  • This research has implications for managing underwater noise impacts on marine mammals.