Classification of broadband echoes from prey of a foraging Blainville's beaked whale

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2008-03Author
Jones, Benjamin A.
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Stanton, Timothy K.
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Lavery, Andone C.
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Johnson, Mark P.
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Madsen, Peter T.
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Tyack, Peter L.
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https://hdl.handle.net/1912/2339As published
https://doi.org/10.1121/1.2828210DOI
10.1121/1.2828210Keyword
Bioacoustics; ZoologyAbstract
Blainville's beaked whales (Mesoplodon densirostris) use broadband, ultrasonic echolocation signals with a −10 dB bandwidth from 26 to 51 kHz to search for, localize, and approach prey that generally consist of mid-water and deep-water fishes and squid. Although it is well known that the spectral characteristics of broadband echoes from marine organisms vary as a function of size, shape, orientation, and anatomical group, there is little evidence as to whether or not free-ranging toothed whales use spectral cues in discriminating between prey and nonprey. In order to study the prey-classification process, a stereo acoustic tag was deployed on a Blainville's beaked whale so that emitted clicks and the corresponding echoes from targets in the water could be recorded. A comparison of echoes from targets apparently selected by the whale and those from a sample of scatterers that were not selected suggests that spectral features of the echoes, target strengths, or both may have been used by the whale to discriminate between echoes. Specifically, the whale appears to favor targets with one or more nulls in the echo spectra and to seek prey with higher target strengths at deeper depths.
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Author Posting. © Acoustical Society of America, 2008. 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 123 (2008): 1753-1762, doi:10.1121/1.2828210.
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Journal of the Acoustical Society of America 123 (2008): 1753-1762Related items
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