| Narrow band high frequency clicks from Hourglass dolphins (Lagenorhynchus cruciger). | |
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MedLine Citation:
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PMID: 18530696 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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The source properties of toothed whale echolocation clicks are essential for evaluating the performance of biosonar systems. However, such data only exist for a small number of free ranging toothed whale species. Here we present a quantitative analysis of the first recordings of echolocation sounds from hour glass dolphins (Lagenorhynchus cruciger) made in the Drake Strait. Recordings were made with a vertical array of four broad-band, calibrated hydrophones that allows for acoustic localization and source parameter derivation. Only apparent on-axis clicks were used for analysis. Hour glass dolphins produce clicks with a mean peak and centroid frequency around 128kHz, a narrow, mean RMS bandwidth of 10kHz with no energy below 100kHz and a mean signal duration of 161mus. Echolocation clicks of hour glass dolphins are thus of the high frequency narrow band-width type (NBHF type) found in porpoises, a few delphinids of the Cephalorhynchus genus and the pygmy sperm whale Kogia breviceps, but are strikingly different from other dolphins. Acoustic convergence from vastly different genera and ecotypes suggest that evolution of NBHF clicks are adaptations to special auditory processing or acoustic crypsis rather than to habitat. |
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Authors:
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Line A Kyhn; Jakob Tougaard; Magnus Wahlberg; Kristian Beedholm; Peter T Madsen |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 123 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2008 May |
Date Detail:
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Created Date: 2008-06-05 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 3363 Citation Subset: IM |
Affiliation:
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National Environmental Research Institute, University of Aarhus, Frederiksborgvej399, DK-4000 Roskilde, Denmark, lky@dmu.dk. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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