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Off-axis effects on the multipulse structure of sperm whale usual clicks with implications for sound production

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dc.contributor.author Zimmer, Walter M. X.
dc.contributor.author Madsen, Peter T.
dc.contributor.author Teloni, Valeria
dc.contributor.author Johnson, Mark P.
dc.contributor.author Tyack, Peter L.
dc.date.accessioned 2008-08-27T16:02:28Z
dc.date.available 2008-08-27T16:02:28Z
dc.date.issued 2005-11
dc.identifier.citation Journal of the Acoustical Society of America 118 (2005): 3337-3345 en
dc.identifier.uri http://hdl.handle.net/1912/2359
dc.description Author Posting. © Acoustical Society of America, 2005. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 118 (2005): 3337-3345, doi:10.1121/1.2082707. en
dc.description.abstract Sperm whales (Physeter macrocephalus) produce multipulsed clicks with their hypertrophied nasal complex. The currently accepted view of the sound generation process is based on the click structure measured directly in front of, or behind, the whale where regular interpulse intervals (IPIs) are found between successive pulses in the click. Most sperm whales, however, are recorded with the whale in an unknown orientation with respect to the hydrophone where the multipulse structure and the IPI do not conform to a regular pulse pattern. By combining far-field recordings of usual clicks with acoustic and orientation information measured by a tag on the clicking whale, we analyzed clicks from known aspects to the whale. We show that a geometric model based on the bent horn theory for sound production can explain the varying off-axis multipulse structure. Some of the sound energy that is reflected off the frontal sac radiates directly into the water creating an intermediate pulse p1/2 seen in off-axis recordings. The powerful p1 sonar pulse exits the front of the junk as predicted by the bent-horn model, showing that the junk of the sperm whale nasal complex is both anatomically and functionally homologous to the melon of smaller toothed whales. en
dc.description.sponsorship This work was funded by grants to from the Office of Naval Research Grant Nos. N00014-99-1-0819 and No. N00014-01-1-0705, and the Packard Foundation. en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Acoustical Society of America en
dc.relation.uri http://dx.doi.org/10.1121/1.2082707
dc.subject Bioacoustics en
dc.subject Underwater sound en
dc.subject Biocommunications en
dc.title Off-axis effects on the multipulse structure of sperm whale usual clicks with implications for sound production en
dc.type Article en
dc.identifier.doi 10.1121/1.2082707


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