Show simple item record

dc.contributor.authorHansen, Michael  Concept link
dc.contributor.authorWahlberg, Magnus  Concept link
dc.contributor.authorMadsen, Peter T.  Concept link
dc.date.accessioned2009-03-13T14:41:32Z
dc.date.available2009-03-13T14:41:32Z
dc.date.issued2008-12
dc.identifier.citationJournal of the Acoustical Society of America 124 (2008): 4059-4068en
dc.identifier.urihttps://hdl.handle.net/1912/2731
dc.descriptionAuthor 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 124 (2008): 4059-4068, doi:10.1121/1.2945154.en
dc.description.abstractUnderwater sound signals for biosonar and communication normally have different source properties to serve the purposes of generating efficient acoustic backscatter from small objects or conveying information to conspecifics. Harbor porpoises (Phocoena phocoena) are nonwhistling toothed whales that produce directional, narrowband, high-frequency (HF) echolocation clicks. This study tests the hypothesis that their 130 kHz HF clicks also contain a low-frequency (LF) component more suited for communication. Clicks from three captive porpoises were analyzed to quantify the LF and HF source properties. The LF component is 59 (S.E.M=1.45 dB) dB lower than the HF component recorded on axis, and even at extreme off-axis angles of up to 135°, the HF component is 9 dB higher than the LF component. Consequently, the active space of the HF component will always be larger than that of the LF component. It is concluded that the LF component is a by-product of the sound generator rather than a dedicated pulse produced to serve communication purposes. It is demonstrated that distortion and clipping in analog tape recorders can explain some of the prominent LF components reported in earlier studies, emphasizing the risk of erroneous classification of sound types based on recording artifacts.en
dc.description.sponsorshipThis work was supported by the Carlsberg Foundation and Oticon, and via a Steno Scholarship from the Danish Natural Science Research Council to PTM.en
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherAcoustical Society of Americaen
dc.relation.urihttps://doi.org/10.1121/1.2945154
dc.subjectBioacousticsen
dc.subjectMechanoceptionen
dc.subjectUnderwater sounden
dc.subjectZoologyen
dc.titleLow-frequency components in harbor porpoise (Phocoena phocoena) clicks : communication signal, by-products, or artifacts?en
dc.typeArticleen
dc.identifier.doi10.1121/1.2945154


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record