Asset Details
Do you wish to reserve the book?
Similar Hearing Thresholds at 8 kHz, but Dissimilar Susceptibility of Hearing to Damage by 8 kHz Sounds in a Harbor Porpoise, a Harbor Seal, and a California Sea Lion
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
Similar Hearing Thresholds at 8 kHz, but Dissimilar Susceptibility of Hearing to Damage by 8 kHz Sounds in a Harbor Porpoise, a Harbor Seal, and a California Sea Lion
Do you wish to request the book?
Similar Hearing Thresholds at 8 kHz, but Dissimilar Susceptibility of Hearing to Damage by 8 kHz Sounds in a Harbor Porpoise, a Harbor Seal, and a California Sea Lion
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
Similar Hearing Thresholds at 8 kHz, but Dissimilar Susceptibility of Hearing to Damage by 8 kHz Sounds in a Harbor Porpoise, a Harbor Seal, and a California Sea Lion
2025
Overview
For each mammalian species, the pattern of susceptibility to temporary hearing threshold shift (TTS) with changing frequency has been assumed to be related to the pattern of hearing thresholds with changing frequency (the basic audiogram). This relationship was tested with one individual of each of three marine mammal species: one odontocete (harbor porpoise [Phocoena phocoena]) and two pinniped species (harbor seal [Phoca vitulina] and California sea lion [Zalophus californianus]). Audiograms showed that they had similar basic hearing thresholds at 8 kHz (61, 59, and 60 dB re 1 µPa, respectively). Hearing thresholds for narrow-band sweeps at 11.3 kHz (the hearing frequency at which the greatest TTS occurred in all three species) before and after exposure for 1 h to a continuous, constant-amplitude, one-sixth-octave noise band centered at 8 kHz at several sound exposure levels (SELs) showed that the TTS experienced by the three individuals differed. The 6 dB TTS-onset SELs were for the harbor porpoise: 169 dB re 1 µPa2s; for the harbor seal: 182 dB re 1 µPa2s; and for the California sea lion: 176 dB re 1 µPa2s. The pattern of increase in TTS with increasing SEL was steeper for the harbor porpoise and harbor seal than for the California sea lion. This means that TTS onset occurs at a different sensation level (i.e., at a different number of dB above the basic hearing threshold) in each of the three marine mammal species. Therefore, different policies, recommendations, or regulations for permissible sound exposure are needed for each species.
