Detection thresholds of a harbour seal to repeated underwater high-frequency, short-duration sinusoidal pulses
Underwater hearing thresholds of a harbour seal (Phoca vitulina) were obtained from 1 to 64 kHz using sinusoidal pulses as short as 0.5 ms. The lowest threshold was 57 dB (re 1 μPa) at 8 kHz. Thresholds for 500- to 50-ms tones increased to about 70 dB (re 1 μPa) in the 1- to 4-kHz and 32-kHz ranges...
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1988
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crcansciencepubl:10.1139/z88-230 2024-03-03T08:45:09+00:00 Detection thresholds of a harbour seal to repeated underwater high-frequency, short-duration sinusoidal pulses Terhune, J. M. 1988 http://dx.doi.org/10.1139/z88-230 http://www.nrcresearchpress.com/doi/pdf/10.1139/z88-230 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 66, issue 7, page 1578-1582 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1988 crcansciencepubl https://doi.org/10.1139/z88-230 2024-02-07T10:53:40Z Underwater hearing thresholds of a harbour seal (Phoca vitulina) were obtained from 1 to 64 kHz using sinusoidal pulses as short as 0.5 ms. The lowest threshold was 57 dB (re 1 μPa) at 8 kHz. Thresholds for 500- to 50-ms tones increased to about 70 dB (re 1 μPa) in the 1- to 4-kHz and 32-kHz ranges and to 111 dB (re 1 μPa) at 64 kHz. At 50 ms duration, thresholds were from 0 to 6 dB greater than the maximum sensitivity for each frequency tested. Thus, only very brief seal vocalizations are not as audible as longer (and equally loud) underwater calls. For pulses shorter than 400 cycles, the thresholds increased linearly with the logarithm of the number of cycles, independent of frequency (4–32 kHz). The total energy of the pulses at threshold was estimated. From 4 to 32 kHz, as the pulse durations shortened, the threshold energy value decreased and then began to increase. These findings bring into question the concept that when presented with high-frequency sound, the auditory system integrates energy for a specific time period. Article in Journal/Newspaper harbour seal Phoca vitulina Canadian Science Publishing Canadian Journal of Zoology 66 7 1578 1582 |
institution |
Open Polar |
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Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Terhune, J. M. Detection thresholds of a harbour seal to repeated underwater high-frequency, short-duration sinusoidal pulses |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Underwater hearing thresholds of a harbour seal (Phoca vitulina) were obtained from 1 to 64 kHz using sinusoidal pulses as short as 0.5 ms. The lowest threshold was 57 dB (re 1 μPa) at 8 kHz. Thresholds for 500- to 50-ms tones increased to about 70 dB (re 1 μPa) in the 1- to 4-kHz and 32-kHz ranges and to 111 dB (re 1 μPa) at 64 kHz. At 50 ms duration, thresholds were from 0 to 6 dB greater than the maximum sensitivity for each frequency tested. Thus, only very brief seal vocalizations are not as audible as longer (and equally loud) underwater calls. For pulses shorter than 400 cycles, the thresholds increased linearly with the logarithm of the number of cycles, independent of frequency (4–32 kHz). The total energy of the pulses at threshold was estimated. From 4 to 32 kHz, as the pulse durations shortened, the threshold energy value decreased and then began to increase. These findings bring into question the concept that when presented with high-frequency sound, the auditory system integrates energy for a specific time period. |
format |
Article in Journal/Newspaper |
author |
Terhune, J. M. |
author_facet |
Terhune, J. M. |
author_sort |
Terhune, J. M. |
title |
Detection thresholds of a harbour seal to repeated underwater high-frequency, short-duration sinusoidal pulses |
title_short |
Detection thresholds of a harbour seal to repeated underwater high-frequency, short-duration sinusoidal pulses |
title_full |
Detection thresholds of a harbour seal to repeated underwater high-frequency, short-duration sinusoidal pulses |
title_fullStr |
Detection thresholds of a harbour seal to repeated underwater high-frequency, short-duration sinusoidal pulses |
title_full_unstemmed |
Detection thresholds of a harbour seal to repeated underwater high-frequency, short-duration sinusoidal pulses |
title_sort |
detection thresholds of a harbour seal to repeated underwater high-frequency, short-duration sinusoidal pulses |
publisher |
Canadian Science Publishing |
publishDate |
1988 |
url |
http://dx.doi.org/10.1139/z88-230 http://www.nrcresearchpress.com/doi/pdf/10.1139/z88-230 |
genre |
harbour seal Phoca vitulina |
genre_facet |
harbour seal Phoca vitulina |
op_source |
Canadian Journal of Zoology volume 66, issue 7, page 1578-1582 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z88-230 |
container_title |
Canadian Journal of Zoology |
container_volume |
66 |
container_issue |
7 |
container_start_page |
1578 |
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1582 |
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1792500688378396672 |