Sperm whale clicks:Directionality and source level revisited
In sperm whales ~Physeter catodon L. 1758! the nose is vastly hypertrophied, accounting for about one-third of the length or weight of an adult male. Norris and Harvey @in Animal Orientation and Navigation, NASA SP-262 ~1972!, pp. 397–417# ascribed a sound-generating function to this organ complex....
Published in: | The Journal of the Acoustical Society of America |
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Online Access: | https://portal.findresearcher.sdu.dk/da/publications/d3464700-dae0-11dc-860c-000ea68e967b https://doi.org/10.1121/1.428329 |
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ftsydanskunivpub:oai:sdu.dk:publications/d3464700-dae0-11dc-860c-000ea68e967b 2024-09-15T17:39:23+00:00 Sperm whale clicks:Directionality and source level revisited Møhl, Bertel Wahlberg, Magnus Madsen, Peter T. Miller, Lee Surlykke, Annemarie 2000 https://portal.findresearcher.sdu.dk/da/publications/d3464700-dae0-11dc-860c-000ea68e967b https://doi.org/10.1121/1.428329 eng eng https://portal.findresearcher.sdu.dk/da/publications/d3464700-dae0-11dc-860c-000ea68e967b info:eu-repo/semantics/closedAccess Møhl , B , Wahlberg , M , Madsen , P T , Miller , L & Surlykke , A 2000 , ' Sperm whale clicks : Directionality and source level revisited ' , The Journal of the Acoustical Society of America , vol. 107 , no. 1 , pp. 638-648 . https://doi.org/10.1121/1.428329 article 2000 ftsydanskunivpub https://doi.org/10.1121/1.428329 2024-07-29T23:46:23Z In sperm whales ~Physeter catodon L. 1758! the nose is vastly hypertrophied, accounting for about one-third of the length or weight of an adult male. Norris and Harvey @in Animal Orientation and Navigation, NASA SP-262 ~1972!, pp. 397–417# ascribed a sound-generating function to this organ complex. A sound generator weighing upward of 10 tons and with a cross-section of 1 m is expected to generate high-intensity, directional sounds. This prediction from the Norris and Harvey theory is not supported by published data for sperm whale clicks ~source levels of 180 dB re 1 mPa and little, if any, directionality!. Either the theory is not borne out or the data is not representative for the capabilities of the sound-generating mechanism. To increase the amount of relevant data, a five-hydrophone array, suspended from three platforms separated by 1 km and linked by radio, was deployed at the slope of the continental shelf off Andenes, Norway, in the summers of 1997 and 1998. With this system, source levels up to 223 dB re 1 mPa peRMS were recorded. Also, source level differences of 35 dB for the same click at different directions were seen, which are interpreted as evidence for high directionality. This implicates sonar as a possible function of the clicks. Thus, previously published properties of sperm whale clicks underestimate the capabilities of the sound generator and therefore cannot falsify the Norris and Harvey theory. Article in Journal/Newspaper Andenes Sperm whale University of Southern Denmark Research Portal The Journal of the Acoustical Society of America 107 1 638 648 |
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Open Polar |
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University of Southern Denmark Research Portal |
op_collection_id |
ftsydanskunivpub |
language |
English |
description |
In sperm whales ~Physeter catodon L. 1758! the nose is vastly hypertrophied, accounting for about one-third of the length or weight of an adult male. Norris and Harvey @in Animal Orientation and Navigation, NASA SP-262 ~1972!, pp. 397–417# ascribed a sound-generating function to this organ complex. A sound generator weighing upward of 10 tons and with a cross-section of 1 m is expected to generate high-intensity, directional sounds. This prediction from the Norris and Harvey theory is not supported by published data for sperm whale clicks ~source levels of 180 dB re 1 mPa and little, if any, directionality!. Either the theory is not borne out or the data is not representative for the capabilities of the sound-generating mechanism. To increase the amount of relevant data, a five-hydrophone array, suspended from three platforms separated by 1 km and linked by radio, was deployed at the slope of the continental shelf off Andenes, Norway, in the summers of 1997 and 1998. With this system, source levels up to 223 dB re 1 mPa peRMS were recorded. Also, source level differences of 35 dB for the same click at different directions were seen, which are interpreted as evidence for high directionality. This implicates sonar as a possible function of the clicks. Thus, previously published properties of sperm whale clicks underestimate the capabilities of the sound generator and therefore cannot falsify the Norris and Harvey theory. |
format |
Article in Journal/Newspaper |
author |
Møhl, Bertel Wahlberg, Magnus Madsen, Peter T. Miller, Lee Surlykke, Annemarie |
spellingShingle |
Møhl, Bertel Wahlberg, Magnus Madsen, Peter T. Miller, Lee Surlykke, Annemarie Sperm whale clicks:Directionality and source level revisited |
author_facet |
Møhl, Bertel Wahlberg, Magnus Madsen, Peter T. Miller, Lee Surlykke, Annemarie |
author_sort |
Møhl, Bertel |
title |
Sperm whale clicks:Directionality and source level revisited |
title_short |
Sperm whale clicks:Directionality and source level revisited |
title_full |
Sperm whale clicks:Directionality and source level revisited |
title_fullStr |
Sperm whale clicks:Directionality and source level revisited |
title_full_unstemmed |
Sperm whale clicks:Directionality and source level revisited |
title_sort |
sperm whale clicks:directionality and source level revisited |
publishDate |
2000 |
url |
https://portal.findresearcher.sdu.dk/da/publications/d3464700-dae0-11dc-860c-000ea68e967b https://doi.org/10.1121/1.428329 |
genre |
Andenes Sperm whale |
genre_facet |
Andenes Sperm whale |
op_source |
Møhl , B , Wahlberg , M , Madsen , P T , Miller , L & Surlykke , A 2000 , ' Sperm whale clicks : Directionality and source level revisited ' , The Journal of the Acoustical Society of America , vol. 107 , no. 1 , pp. 638-648 . https://doi.org/10.1121/1.428329 |
op_relation |
https://portal.findresearcher.sdu.dk/da/publications/d3464700-dae0-11dc-860c-000ea68e967b |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1121/1.428329 |
container_title |
The Journal of the Acoustical Society of America |
container_volume |
107 |
container_issue |
1 |
container_start_page |
638 |
op_container_end_page |
648 |
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1810479580817915904 |