2025_programme: Cetacean Audiogram Modelling

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  • Day: June 17, Tuesday
      Location / Time: A. TERPSIHORI at 09:10 - 09:30
  • Last minutes changes: -
  • Session: 08a. Bioacoustics and Soundscape
    Organiser(s): Jennifer Miksis-Olds, Giacomo Giorli
    Chairperson(s): Jennifer Miksis-Olds, Giacomo Giorli
  • Lecture: Cetacean Audiogram Modelling [Invited]
    Paper ID: 2362
    Author(s): Darlene Ketten, Andrew Tubelli, Aleks Zosuls
    Presenter: Darlene Ketten
    Abstract: Cetacean Audiogram Modelling \nDarlene Ketten 1,2; Andrew Tubelli1,3; Aleks Zosuls3 \n1. Brown University, Providence, RI USA \n2. Woods Hole Oceanographic Institution, Woods Hole, MA USA \n3. Masssachusetts Eye and Ear Infirmary, Boston, MA USA\nemail: \n\nIn on-going research, we produced biomechanical Finite Element Models (FEM) from middle ear transfer functions (METF; affects peak sensitivity) and frequency place maps (FPM; total frequencies to which an ear can respond) to estimate minke (Balaenoptera acutorostrata) and humpback (Megaptera novaeangliae) hearing ranges as well as FPMs for right (Eubalaeglacialis) and blue (Balaenoptera musculus) whales with control data for bottlenose dolphins (Tursiops truncatus) and harbor porpoises (Phocoena phocoena) Anatomically derived FPMs were obtained from microCT scans, basilar membrane histology, and nanoindentation stiffness measurements. FEM simulations of frequency response peak sensitivities used middle ear transfer function (METF) and Laser Doppler measurements of stapes footplate velocities. Frequency responses were measured for stimuli at bone vs tympanic membrane/glove finger sites to assess most sensitive input locations. Odontocetes had a high pass response with corner frequencies from 10 kHz-30 kHz. Response frequencies extended to 125 kHz, the limit of our measurement capability. Mysticetes had a bandpass response characterized by peak sensitivity from 0.5 kHz-2 kHz for stimuli at the glove finger. Preliminary audiograms show peak responses differ among baleen whale species but were generally between 20Hz to 5 kHz with functional (i.e., 60 DB above peak sensitivity; see Fay 1988) hearing ranges of 50 Hz-38 kHz for tested species although the absolute ranges may exceed 40 kHz. The research was supported by the IOGP and Joint Industry Programme on Sound and Marine Life. \n\nFay, R.R. (1988). Hearing in Vertebrates: A Psychophysics Databook. Winnetka, IL: Hill-Fay Associates. ISBN 9780961855901. LCCN 88091030.\n\n
  • Corresponding author: Dr Darlene Ketten
    Affiliation: WHOI and Brown University
    Country: United States

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