期刊
BIOLOGY LETTERS
卷 16, 期 8, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rsbl.2020.0134
关键词
sensory ecology; acoustic scene; prey selection; acoustic debilitation; toothed whale; DTAG
资金
- National Danish Research Council (Det Frie Forskningsrad)
- Regional Foundation for Science and Technology (FRCT, Azores -Portugal) [ACORES-01-0145-FEDER-00057]
Sperm whales use their gigantic nose to produce the most powerful sounds in the animal kingdom, presumably to echolocate deep-sea prey at long ranges and possibly to debilitate prey. To test these hypotheses, we deployed sound recording tags (DTAG-4) on the tip of the nose of three sperm whales. One of these recordings yielded over 6000 echo streams from organisms detected up to 144 m ahead of the whale, supporting a long-range prey detection function of the sperm whale biosonar. The whale navigated this complex acoustic scene by maintaining a stable, long-range acoustic gaze suggesting continual resource evaluation. Less than 10% of the echoic organisms recorded by the tag were targeted for capture and only 18% of the buzzes were emitted within the 50 m depth interval of maximum organism encounter rate, demonstrating echo-guided prey selection. Buzzes were initiated more than 20 m from the prey, showing that sperm whales do not debilitate their prey with sound, but trade echo levels for reduced forward masking and rapid updates on prey location in keeping with the lower manoeuvrability of these large predators. We conclude that the powerful biosonar of sperm whales enables long-range echolocation and selection of prey, but not acoustic debilitation.
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