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Article: Echolocation signals of Heaviside's dolphins (Cephalorhynchus heavisidii)

TitleEcholocation signals of Heaviside's dolphins (Cephalorhynchus heavisidii)
Authors
Issue Date2011
PublisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.html
Citation
Journal Of The Acoustical Society Of America, 2011, v. 129 n. 1, p. 449-457 How to Cite?
AbstractField recordings of echolocation signals produced by Heaviside's dolphins (Cephalorhynchus heavisidii) were made off the coast of South Africa using a hydrophone array system. The system consisted of three hydrophones and an A-tag (miniature stereo acoustic data-logger). The mean centroid frequency was 125 kHz, with a -3 dB bandwidth of 15 kHz and -10 dB duration of 74 s. The mean back-calculated apparent source level was 173 dB re 1 Pa p.-p.. These characteristics are very similar to those found in other Cephalorhynchus species, and such narrow-band high-frequency echolocation clicks appear to be a defining characteristic of the Cephalorhynchus genus. Click bursts with very short inter-click intervals (up to 2 ms) were also recorded, which produced the cry sound reported in other Cephalorhynchus species. Since inter-click intervals correlated positively to click duration and negatively to bandwidth, Heaviside's dolphins may adjust their click duration and bandwidth based on detection range. The bimodal distribution of the peak frequency and stable bimodal peaks in spectra of individual click suggest a slight asymmetry in the click production mechanism. © 2011 Acoustical Society of America.
Persistent Identifierhttp://hdl.handle.net/10722/140937
ISSN
2015 Impact Factor: 1.572
2015 SCImago Journal Rankings: 0.938
ISI Accession Number ID
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)19-10265
South African National Research Foundation61472
Funding Information:

This research was supported by a Grant-in-Aid for Japan Society for the Promotion of Science (JSPS) Fellows (Grant No. 19-10265) to T. M., the South African National Research Foundation Grant No. 61472 awarded to L. K., and Research and Development Program for New Bio-industry Initiatives, Japan, to T. A. We are grateful to W. L. Whitlow Au and an anonymous reviewer for helpful comments on the manuscript. We would like to thank T. Photopoulos, R. Reisinger, N. Takanawa, A. du Randt, M. Baloyi, I. Peters, and P. Best for their help in conducting this research. We also thank H. Emoto, K. Tokunaga, and T. Shinke (System Intech, Co., Ltd.) for their help and comments for our equipment.

References

 

DC FieldValueLanguage
dc.contributor.authorMorisaka, Ten_HK
dc.contributor.authorKarczmarski, Len_HK
dc.contributor.authorAkamatsu, Ten_HK
dc.contributor.authorSakai, Men_HK
dc.contributor.authorDawson, Sen_HK
dc.contributor.authorThornton, Men_HK
dc.date.accessioned2011-09-23T06:22:06Z-
dc.date.available2011-09-23T06:22:06Z-
dc.date.issued2011en_HK
dc.identifier.citationJournal Of The Acoustical Society Of America, 2011, v. 129 n. 1, p. 449-457en_HK
dc.identifier.issn0001-4966en_HK
dc.identifier.urihttp://hdl.handle.net/10722/140937-
dc.description.abstractField recordings of echolocation signals produced by Heaviside's dolphins (Cephalorhynchus heavisidii) were made off the coast of South Africa using a hydrophone array system. The system consisted of three hydrophones and an A-tag (miniature stereo acoustic data-logger). The mean centroid frequency was 125 kHz, with a -3 dB bandwidth of 15 kHz and -10 dB duration of 74 s. The mean back-calculated apparent source level was 173 dB re 1 Pa p.-p.. These characteristics are very similar to those found in other Cephalorhynchus species, and such narrow-band high-frequency echolocation clicks appear to be a defining characteristic of the Cephalorhynchus genus. Click bursts with very short inter-click intervals (up to 2 ms) were also recorded, which produced the cry sound reported in other Cephalorhynchus species. Since inter-click intervals correlated positively to click duration and negatively to bandwidth, Heaviside's dolphins may adjust their click duration and bandwidth based on detection range. The bimodal distribution of the peak frequency and stable bimodal peaks in spectra of individual click suggest a slight asymmetry in the click production mechanism. © 2011 Acoustical Society of America.en_HK
dc.languageengen_US
dc.publisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.htmlen_HK
dc.relation.ispartofJournal of the Acoustical Society of Americaen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.rightsCopyright (2011) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in (Journal of the Acoustical Society of America, 2011, v. 129 n. 1, p. 449-457) and may be found at (http://asadl.org/jasa/resource/1/jasman/v129/i1/p449_s1).en_US
dc.subject.meshAcoustics - instrumentation-
dc.subject.meshDolphins - physiology-
dc.subject.meshEcholocation-
dc.subject.meshSound Spectrography-
dc.subject.meshVocalization, Animal-
dc.titleEcholocation signals of Heaviside's dolphins (Cephalorhynchus heavisidii)en_HK
dc.typeArticleen_HK
dc.identifier.emailKarczmarski, L: leszek@hku.hken_HK
dc.identifier.authorityKarczmarski, L=rp00713en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1121/1.3519401en_HK
dc.identifier.pmid21303024-
dc.identifier.scopuseid_2-s2.0-79551655141en_HK
dc.identifier.hkuros196237en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79551655141&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume129en_HK
dc.identifier.issue1en_HK
dc.identifier.spage449en_HK
dc.identifier.epage457en_HK
dc.identifier.eissn1520-8524-
dc.identifier.isiWOS:000286944600050-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridMorisaka, T=8587879500en_HK
dc.identifier.scopusauthoridKarczmarski, L=6603422145en_HK
dc.identifier.scopusauthoridAkamatsu, T=7101930604en_HK
dc.identifier.scopusauthoridSakai, M=13408948200en_HK
dc.identifier.scopusauthoridDawson, S=26022973700en_HK
dc.identifier.scopusauthoridThornton, M=15047292700en_HK

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