TY - JOUR
TI - Underwater Hearing Sensitivity of Harbor Seals (Phoca vitulina) for Narrow Noise Bands Between 0.2 and 80 kHz
AU - Kastelein, R
AU - Wensveen, P
AU - Hoek, L
AU - Terhune, J
T2 - The Journal of the Acoustical Society of America
AB - 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 approximately 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.
DA - 2009/04//
PY - 2009
VL - 126
IS - 1
SP - 476–483
UR - http://scitation.aip.org/content/asa/journal/jasa/126/1/10.1121/1.3132522
DO - 10.1121/1.3132522
LA - English
KW - Noise
KW - Marine Mammals
KW - Pinnipeds
ER -