Transmission beam characteristics of a Risso's dolphin (Grampus griseus)
| Autor: | Brendan P. Rideout, Paul E. Nachtigall, Wan-Hsiu Huang, I-Fan Jen, Adam B. Smith, Wei-Cheng Yang, Laura N. Kloepper |
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| Rok vydání: | 2016 |
| Předmět: |
030110 physiology
0106 biological sciences 0301 basic medicine Sound Spectrography Acoustics and Ultrasonics Bioacoustics Dolphins Acoustics Human echolocation 010603 evolutionary biology 01 natural sciences Beamwidth 03 medical and health sciences Arts and Humanities (miscellaneous) biology.animal Animals Grampus griseus Sound pressure Physics biology Whale Bottlenose dolphin biology.organism_classification Echolocation Regression Analysis Female Head Porpoise |
| Zdroj: | The Journal of the Acoustical Society of America. 139:53-62 |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.4937752 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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