Hearing threshold shifts and recovery after noise exposure in beluga whales, Delphinapterus leucas
| Autor: | Vladimir V. Popov, Mikhail B. Tarakanov, Vladimir O. Klishin, Viatcheslav V. Rozhnov, Dmitry I. Nechaev, Alexander Ya. Supin, Evgenia V. Sysuyeva, Mikhail G. Pletenko |
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| Rok vydání: | 2013 |
| Předmět: |
Male
Sound Spectrography Time Factors Physiology Acoustics Aquatic Science Noise exposure Audiometry Hearing Animals Center frequency Octave bandwidth Molecular Biology Ecology Evolution Behavior and Systematics Absolute threshold of hearing Ranging Auditory Threshold Environmental Exposure Noise Insect Science Evoked Potentials Auditory Environmental science Beluga Whale Animal Science and Zoology Female Auditory fatigue |
| Zdroj: | The Journal of experimental biology. 216(Pt 9) |
| ISSN: | 1477-9145 |
| Popis: | SUMMARY Temporary threshold shift (TTS) after loud noise exposure was investigated in a male and a female beluga whale (Delphinapterus leucas). The thresholds were evaluated using the evoked-potential technique, which allowed for threshold tracing with a resolution of ~1 min. The fatiguing noise had a 0.5 octave bandwidth, with center frequencies ranging from 11.2 to 90 kHz, a level of 165 dB re. 1 μPa and exposure durations from 1 to 30 min. The effects of the noise were tested at probe frequencies ranging from −0.5 to +1.5 octaves relative to the noise center frequency. The effect was estimated in terms of both immediate (1.5 min) post-exposure TTS and recovery duration. The highest TTS with the longest recovery duration was produced by noises of lower frequencies (11.2 and 22.5 kHz) and appeared at a test frequency of +0.5 octave. At higher noise frequencies (45 and 90 kHz), the TTS decreased. The TTS effect gradually increased with prolonged exposures ranging from 1 to 30 min. There was a considerable TTS difference between the two subjects. |
| Databáze: | OpenAIRE |
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