Acoustic properties of humpback whale songs

被引:147
作者
Au, Whitlow W. L.
Pack, Adam A.
Lammers, Marc O.
Herman, Louis M.
Deakos, Mark H.
Andrews, Kim
机构
[1] Univ Hawaii, Hawaii Inst Marine Biol, Marine Mammal Res Program, Kailua, HI 96734 USA
[2] Dolphin Inst, Honolulu, HI 96814 USA
[3] Hawaii Assoc Marine Educ & Res Inc, Lahaina, HI 96761 USA
关键词
D O I
10.1121/1.2211547
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
A vertical array of five hydrophones was used to measure the acoustic field in the vertical plane of singing humpback whales. Once a singer was located, two swimmers with snorkel gear were deployed to determine the orientation of the whale and position the boat so that the array could be deployed in front of the whale at a minimum standoff distance of at least 10 m. The spacing of the hydrophones was 7 m with the deepest hydrophone deployed at a depth of 35 m. An eight-channel TASCAM recorder with a bandwidth of 24 kHz was used to record the hydrophone signals. The location (distance and depth) of the singer was determined by computing the time of arrival differences between the hydrophone signals. The maximum source level varied between individual units in a song, with values between 151 and 173 dB re 1 mu Pa. One of the purposes of this study was to estimate potential sound exposure of nearby conspecifics. The acoustic field determined by considering the relative intensity of higher frequency harmonics in the signals indicated that the sounds are projected in the horizontal direction despite the singer being canted head downward anywhere from about 25 degrees to 90 degrees. High-frequency harmonics extended beyond 24 kHz, suggesting that humpback whales may have an upper frequency limit of hearing as high as 24 kHz. (c) 2006 Acoustical Society of America.
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页码:1103 / 1110
页数:8
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