https://scholars.lib.ntu.edu.tw/handle/123456789/410079
標題: | Transmission beam characteristics of a Risso's dolphin (Grampus griseus) | 作者: | Smith, Adam Kloepper, Laura Yang, Wei-cheng Huang, Wan-Hsiu Jen, I-Fan P Rideout, Brendan Nachtigall, Paul |
關鍵字: | Acoustics; Mammals; Sonar; Beam directivity; Bottlenose dolphins; False killer whales; Frequency contents; Frequency dependent; Sound pressure level; Source parameters; Transmission beams; Dolphins (structures); anatomy and histology; animal; echolocation; female; head; physiology; regression analysis; sound detection; toothed whale; Animals; Dolphins; Echolocation; Female; Head; Regression Analysis; Sound Spectrography | 公開日期: | 2016 | 卷: | 139 | 來源出版物: | The Journal of the Acoustical Society of America | 摘要: | The echolocation system of the Risso's dolphin (Grampus griseus) remains poorly studied compared to other odontocete species. In this study, echolocation signals were recorded from a stationary Risso's dolphin with an array of 16 hydrophones and the two-dimensional beam shape was explored using frequency-dependent amplitude plots. Click source parameters were similar to those already described for this species. Centroid frequency of click signals increased with increasing sound pressure level, while the beamwidth decreased with increasing center frequency. Analysis revealed primarily single-lobed, and occasionally vertically dual-lobed, beam shapes. Overall beam directivity was found to be greater than that of the harbor porpoise, bottlenose dolphin, and a false killer whale. The relationship between frequency content, beam directivity, and head size for this Risso's dolphin deviated from the trend described for other species. These are the first reported measurements of echolocation beam shape and directivity in G. griseus. ? 2016 Acoustical Society of America. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/410079 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84954156595&doi=10.1121%2f1.4937752&partnerID=40&md5=ed29ff0b4aae224f038d243206938917 |
DOI: | 10.1121/1.4937752] |
顯示於: | 獸醫學系 |
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