Temporary threshold shifts and recovery following noise exposure in the Atlantic bottlenosed dolphin (Tursiops truncatus).
Behaviorally determined hearing thresholds for a 7.5-kHz tone for an Atlantic bottlenosed dolphin (Tursiops truncatus) were obtained following exposure to fatiguing low-frequency octave band noise. The fatiguing stimulus ranged from 4 to 11 kHz and was gradually increased in intensity to 179 dB re 1 microPa and in duration to 55 min. Exposures occurred no more frequently than once per week. Measured temporary threshold shifts averaged 11 dB. Threshold determination took at least 20 min. Recovery was examined 360, 180, 90, and 45 min following exposure and was essentially complete within 45 min.
Nachtigall
Paul E
PE
Marine Mammal Research Program, Hawaii Institute of Marine Biology, University of Hawaii, P.O. Box 1106, Kailua, Hawaii 96734, USA. nachtiga@hawaii.edu
Pawloski
Jeffrey L
JL
Au
Whitlow W L
WW
D000161:Acoustic Stimulation; D000819:Animal Communication; D000818:Animals; D001305:Auditory Fatigue; D001309:Auditory Threshold; D004455:Echolocation; D006254:Hawaii; D008297:Male; D009622:Noise / Q000009:adverse effects*; D013018:Sound Spectrography; D014828:Vocalization, Animal