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Article: Echolocation signals of Heaviside's dolphins (Cephalorhynchus heavisidii)
Title | Echolocation signals of Heaviside's dolphins (Cephalorhynchus heavisidii) | ||||||
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Authors | |||||||
Issue Date | 2011 | ||||||
Publisher | Acoustical 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? | ||||||
Abstract | Field 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 Identifier | http://hdl.handle.net/10722/140937 | ||||||
ISSN | 2023 Impact Factor: 2.1 2023 SCImago Journal Rankings: 0.687 | ||||||
ISI Accession Number ID |
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 Field | Value | Language |
---|---|---|
dc.contributor.author | Morisaka, T | en_HK |
dc.contributor.author | Karczmarski, L | en_HK |
dc.contributor.author | Akamatsu, T | en_HK |
dc.contributor.author | Sakai, M | en_HK |
dc.contributor.author | Dawson, S | en_HK |
dc.contributor.author | Thornton, M | en_HK |
dc.date.accessioned | 2011-09-23T06:22:06Z | - |
dc.date.available | 2011-09-23T06:22:06Z | - |
dc.date.issued | 2011 | en_HK |
dc.identifier.citation | Journal of the Acoustical Society of America, 2011, v. 129 n. 1, p. 449-457 | - |
dc.identifier.issn | 0001-4966 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/140937 | - |
dc.description.abstract | Field 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.language | eng | en_US |
dc.publisher | Acoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.html | en_HK |
dc.relation.ispartof | Journal of the Acoustical Society of America | en_HK |
dc.rights | Copyright 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 https://doi.org/10.1121/1.3519401 | - |
dc.subject.mesh | Acoustics - instrumentation | - |
dc.subject.mesh | Dolphins - physiology | - |
dc.subject.mesh | Echolocation | - |
dc.subject.mesh | Sound Spectrography | - |
dc.subject.mesh | Vocalization, Animal | - |
dc.title | Echolocation signals of Heaviside's dolphins (Cephalorhynchus heavisidii) | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Karczmarski, L: leszek@hku.hk | en_HK |
dc.identifier.authority | Karczmarski, L=rp00713 | en_HK |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1121/1.3519401 | en_HK |
dc.identifier.pmid | 21303024 | - |
dc.identifier.scopus | eid_2-s2.0-79551655141 | en_HK |
dc.identifier.hkuros | 196237 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-79551655141&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 129 | en_HK |
dc.identifier.issue | 1 | en_HK |
dc.identifier.spage | 449 | en_HK |
dc.identifier.epage | 457 | en_HK |
dc.identifier.eissn | 1520-8524 | - |
dc.identifier.isi | WOS:000286944600050 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Morisaka, T=8587879500 | en_HK |
dc.identifier.scopusauthorid | Karczmarski, L=6603422145 | en_HK |
dc.identifier.scopusauthorid | Akamatsu, T=7101930604 | en_HK |
dc.identifier.scopusauthorid | Sakai, M=13408948200 | en_HK |
dc.identifier.scopusauthorid | Dawson, S=26022973700 | en_HK |
dc.identifier.scopusauthorid | Thornton, M=15047292700 | en_HK |
dc.identifier.issnl | 0001-4966 | - |