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  Asymmetry and dynamics of a narrow sonar beam in an echolocating harbor porpoise

Koblitz, J. C., Wahlberg, M., Stilz, P., Madsen, P. T., Beedholm, K., & Schnitzler, H. U. (2012). Asymmetry and dynamics of a narrow sonar beam in an echolocating harbor porpoise. The Journal of the Acoustical Society of America, 131(3), 2315-2324. doi:10.1121/1.3683254.

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Koblitz, Jens C.1, Author              
Wahlberg, M., Author
Stilz, P., Author
Madsen, P. T., Author
Beedholm, K., Author
Schnitzler, H. U., Author
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1University of Tübingen, ou_persistent22              

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 Abstract: A key component in the operation of a biosonar system is the radiation of sound energy from the sound producing head structures of toothed whales and microbats. The current view involves a fixed transmission aperture by which the beam width can only change via changes in the frequency of radiated clicks. To test that for a porpoise, echolocation clicks were recorded with high angular resolution using a 16 hydrophone array. The beam is narrower than previously reported (DI = 24 dB) and slightly dorso-ventrally compressed (horizontal -3 dB beam width: 13 degrees, vertical -3 dB beam width: 11 degrees). The narrow beam indicates that all smaller toothed whales investigated so far have surprisingly similar beam widths across taxa and habitats. Obtaining high directionality may thus be at least in part an evolutionary factor that led to high centroid frequencies in a group of smaller toothed whales emitting narrow band high frequency clicks. Despite the production of stereotyped narrow band high frequency clicks, changes in the directionality by a few degrees were observed, showing that porpoises can obtain changes in sound radiation. (C) 2012 Acoustical Society of America. [DOI: 10.1121/1.3683254]

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 Dates: 2012-03-15
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: Other: WOS:000301719200059
DOI: 10.1121/1.3683254
ISSN: 0001-4966
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Title: The Journal of the Acoustical Society of America
  Other : JASA
Source Genre: Journal
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Publ. Info: Woodbury, NY : Acoustical Society of America through the American Institute of Physics
Pages: - Volume / Issue: 131 (3) Sequence Number: - Start / End Page: 2315 - 2324 Identifier: ISSN: 1520-9024
CoNE: https://pure.mpg.de/cone/journals/resource/991042754070048