Beaked whale auditory evoked potential hearing measurements |
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| Authors: | Mandy L H Cook René A Varela Juli D Goldstein Stephen D McCulloch Gregory D Bossart James J Finneran Dorian Houser David A Mann |
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| Institution: | (1) College of Marine Science, University of South Florida, 140 Seventh Avenue South, St. Petersburg, FL 33701-5016, USA;(2) Harbor Branch Oceanographic Institution, Inc., 5600 US 1 North, Fort Pierce, FL, 34946, USA;(3) US Navy Marine Mammal Program, Space and Naval Warfare Systems Center, Code 2351, 53560 Hull Street, San Diego, CA 92152-5001, USA;(4) Biomimetica, 7951 Shantung Dr., Santee, CA 92071-3432, USA |
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| Abstract: | Several mass strandings of beaked whales have recently been correlated with military exercises involving mid-frequency sonar highlighting unknowns regarding hearing sensitivity in these species. We report the hearing abilities of a stranded juvenile beaked whale (Mesoplodon europaeus) measured with auditory evoked potentials. The beaked whale’s modulation rate transfer function (MRTF) measured with a 40-kHz carrier showed responses up to an 1,800 Hz amplitude modulation (AM) rate. The MRTF was strongest at the 1,000 and 1,200 Hz AM rates. The envelope following response (EFR) input–output functions were non-linear. The beaked whale was most sensitive to high frequency signals between 40 and 80 kHz, but produced smaller evoked potentials to 5 kHz, the lowest frequency tested. The beaked whale hearing range and sensitivity are similar to other odontocetes that have been measured. |
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| Keywords: | Beaked whale Mesoplodon europaeus Hearing Auditory evoked potential Envelope following response Modulation rate transfer function |
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