Lack of reproducibility of temporary hearing threshold shifts in a harbor porpoise after exposure to repeated airgun sounds
Open Access
Research Article
2020
Journal of the Acoustical Society of America
Kastelein, R.A., Helder-Hoek, L., Cornelisse, S.A., von Benda-Beckmann, A.M., Lam, F-P. A., de Jong, C.A.F., Ketten, D.R.
Noise-induced temporary hearing threshold shift (TTS) was studied in a harbour porpoise exposed to impulsive sounds of scaled-down airguns while both stationary and free-swimming for up to 90 min. There were no changes in the study animal’s audiogram between the studies or significant differences in the fatiguing sound that could explain the difference, but audible and visual cues in the present study may have allowed the porpoise to predict when the fatiguing sounds would be produced. The discrepancy between the studies may have resulted from self-mitigation by the porpoise.
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