Transmission beam pattern and dynamics of a spinner dolphin (Stenella longirostris) Smith, Adam B. Pacini, Aude F. Nachtigall, Paul E. Laule, Gail E. Aragones, Lemnuel V. Magno, Carlo Suarez, Leo J. A. 2019-09-12T18:59:43Z 2019-12-19T08:47:18Z 2019-06-19
dc.description Author Posting. © Acoustical Society of America, 2019. 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 145(6), (2019): 3595, doi:10.1121/1.5111347. en_US
dc.description.abstract Toothed whales possess a sophisticated biosonar system by which ultrasonic clicks are projected in a highly directional transmission beam. Beam directivity is an important biosonar characteristic that reduces acoustic clutter and increases the acoustic detection range. This study measured click characteristics and the transmission beam pattern from a small odontocete, the spinner dolphin (Stenella longirostis). A formerly stranded individual was rehabilitated and trained to station underwater in front of a 16-element hydrophone array. On-axis clicks showed a mean duration of 20.1 μs, with mean peak and centroid frequencies of 58 and 64 kHz [standard deviation (s.d.) ±30 and ±12 kHz], respectively. Clicks were projected in an oval, vertically compressed beam, with mean vertical and horizontal beamwidths of 14.5° (s.d. ± 3.9) and 16.3° (s.d. ± 4.6), respectively. Directivity indices ranged from 14.9 to 27.4 dB, with a mean of 21.7 dB, although this likely represents a broader beam than what is normally produced by wild individuals. A click subset with characteristics more similar to those described for wild individuals exhibited a mean directivity index of 23.3 dB. Although one of the broadest transmission beams described for a dolphin, it is similar to other small bodied odontocetes. en_US
dc.description.embargo 2019-12-19 en_US
dc.description.sponsorship The authors would like to thank the staff at Ocean Adventure for their time and assistance, Laura Kloepper for her assistance and advice on the data analysis, and Andy Solow for his help with the statistical analysis. The array system was originally designed by Stuart Ibsen. This work was funded by a research grant from the Sea World Busch Gardens Conservation Fund awarded to A.F.P. All work was conducted in compliance with University of Hawaii at Manoa IACUC and conducted under NMFS permit No. 16053 to P.E.N. This is contribution No. 1761 from the Hawaii Institute of Marine Biology. en_US
dc.identifier.citation Smith, A. B., Pacini, A. F., & Nachtigall, P. E. (2019). Transmission beam pattern and dynamics of a spinner dolphin (Stenella longirostris). The Journal of the Acoustical Society of America, 145(6), 3595. en_US
dc.identifier.doi 10.1121/1.5111347
dc.publisher Acoustical Society of America en_US
dc.title Transmission beam pattern and dynamics of a spinner dolphin (Stenella longirostris) en_US
dc.type Article en_US
dspace.entity.type Publication
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