The three-dimensional beam pattern of a sperm whale (Physeter macrocephalus) tagged in the Ligurian Sea was derived using data on regular clicks from the tag and from hydrophones towed behind a ship circling the tagged whale. The tag defined the orientation of the whale, while sightings and beamformer data were used to locate the whale with respect to the ship. The existence of a narrow, forward-directed P1 beam with source levels exceeding 1 μPa at 1 m is confirmed. A modeled forward-beam pattern, that matches clicks off-axis, predicts a directivity index of 26.7 dB and source levels of up to 1 μPa at 1 m. A broader backward-directed beam is produced by the P0 pulse with source levels near 1 μPa at 1 m and a directivity index of 7.4 dB. A low-frequency component with source levels near 1 μPa at 1 m is generated at the onset of the P0 pulse by air resonance. The results support the bent-horn model of sound production in sperm whales. While the sperm whale nose appears primarily adapted to produce an intense forward-directed sonar signal, less-directional click components convey information to conspecifics, and give rise to echoes from the seafloor and the surface, which may be useful for orientation during dives.
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March 2005
March 10 2005
Three-dimensional beam pattern of regular sperm whale clicks confirms bent-horn hypothesis
Walter M. X. Zimmer;
Walter M. X. Zimmer
NATO Undersea Research Centre, V.le San Bartolomeo 400, 19138 La Spezia, Italy
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Peter L. Tyack;
Peter L. Tyack
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543
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Mark P. Johnson;
Mark P. Johnson
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543
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Peter T. Madsen
Peter T. Madsen
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543
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J. Acoust. Soc. Am. 117, 1473–1485 (2005)
Article history
Received:
June 30 2004
Accepted:
October 11 2004
Citation
Walter M. X. Zimmer, Peter L. Tyack, Mark P. Johnson, Peter T. Madsen; Three-dimensional beam pattern of regular sperm whale clicks confirms bent-horn hypothesis. J. Acoust. Soc. Am. 1 March 2005; 117 (3): 1473–1485. https://doi.org/10.1121/1.1828501
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