The harp seal, Pagophilus groenlandicus (Erxleben, 1777). III. The underwater audiogram

A free-field underwater audiogram from 0.76 to 100 kHz was obtained for Pagophilus groenlandicus. Areas of increased sensitivity occurred at 2 and 22.9 kHz. The lowest threshold was −32.9 db/μbar at 15.0 kHz. Above 64 kHz the threshold increases at a rate of 40 db/octave. The audiogram was similar t...

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Bibliographic Details
Published in:Canadian Journal of Zoology
Main Authors: Terhune, J. M., Ronald, K.
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 1972
Subjects:
Animal Science and Zoology
Ecology, Evolution, Behavior and Systematics
Harp Seal
Pagophilus groenlandicus
Phoca vitulina
Online Access:http://dx.doi.org/10.1139/z72-077
http://www.nrcresearchpress.com/doi/pdf/10.1139/z72-077
Description
Summary:A free-field underwater audiogram from 0.76 to 100 kHz was obtained for Pagophilus groenlandicus. Areas of increased sensitivity occurred at 2 and 22.9 kHz. The lowest threshold was −32.9 db/μbar at 15.0 kHz. Above 64 kHz the threshold increases at a rate of 40 db/octave. The audiogram was similar to that of the Phoca vitulina. The effects of ambient noise on the audiogram are discussed.

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