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Underwater hearing sensitivity of harbor seals (Phoca vitulina) for narrow noise bands between 0.2 and 80 kHz

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Author(s)

Ronald A. Kastelein, Paul Wensveen, Lean Hoek, John M. Terhune

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Abstract

The underwater hearing sensitivities of two 1.5-year-old female harbor seals were quantified in a quiet pool built specifically for acoustic research, by using a behavioral psychoacoustic technique. The animals were trained to respond when they detected an acoustic signal and not to respond when they did not ("go/no-go" response). Fourteen narrowband noise signals (1/3-octave bands but with some energy in adjacent bands), at 1/3-octave center frequencies of 0.2-80 kHz, and of 900 ms duration, were tested. Thresholds at each frequency were measured using the up-down staircase method and defined as the stimulus level resulting in a 50% detection rate. Between 0.5 and 40 kHz, the thresholds corresponded to a 1/3-octave band noise level of ∼60 dB re 1 μPa (SD±3.0 dB). At lower frequencies, the thresholds increased to 66 dB re 1 μPa and at 80 kHz the thresholds rose to 114 dB re 1 μPa. The 1/3-octave noise band thresholds of the two seals did not differ from each other, or from the narrowband frequency-modulated tone thresholds at the same frequencies obtained a few months before for the same animals. These hearing threshold values can be used to calculate detection ranges of underwater calls and anthropogenic noises by harbor seals.

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Details

Original languageEnglish
Pages (from-to)476-483
Number of pages8
JournalJournal of the Acoustical Society of America
Volume126
Issue number1
DOIs
Publication statusPublished - 2009

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