期刊
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
卷 125, 期 3, 页码 1783-1791出版社
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.3075600
关键词
bioacoustics; biocommunications; mechanoception; zoology
资金
- Danish Galathea3 oceanographic expedition
- Danish Expedition Foundation
- Villum Kann Rasmussen's Foundation
- Knud Hojgaard's Foundation
- RESON A/S and National Instruments
- Galathea3 Expedition
Toothed whales depend on echolocation for orientation and prey localization, and source parameters of echolocation clicks from free-ranging animals therefore convey valuable information about the acoustic physiology and behavioral ecology of the recorded species. Recordings of wild hourglass (Lagenorhynchus cruciger) and Hector's dolphins (Cephalorhynchus hectori) were made in the Drake Passage (between Tierra del Fuego and the Antarctic Peninsular) and Banks Peninsular (Akaroa Harbour, New Zealand) with a four element hydrophone array. Analysis of source parameters shows that both species produce narrow band high-frequency (NBHF) echolocation clicks. Coastal Hector's dolphins produce clicks with a mean peak frequency of 129 kHz, 3 dB bandwidth of 20 kHz, 57 mu s, 10 dB duration, and mean apparent source level (ASL) of 177 dB re 1 mu Pap.-p.. The oceanic hourglass dolphins produce clicks with mean peak frequency of 126 kHz, 3 dB bandwidth of 8 kHz, 116 mu s, 10 dB duration, and a mean estimated ASL of 197 dB re 1 mu Pap.-p.. Thus, hourglass dolphins apparently produce clicks of higher source level, which should allow them to detect prey at more than twice the distance compared to Hector's dolphins. The observed source parameter differences within these two NBHF species may be an adaptation to a coastal cluttered environment versus a deep water, pelagic habitat.
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