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Testing the odontocete acoustic prey debilitation hypothesis: No stunning results Public Deposited

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https://ir.library.oregonstate.edu/concern/articles/ng451k14r

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  • The hypothesis that sounds produced by odontocetes can debilitate fish was examined. The effects of simulated odontocete pulsed signals on three species of fish commonly preyed on by odontocetes were examined, exposing three individuals of each species as well as groups of four fish to a high-frequency click of a bottlenose dolphin [peak frequency (PF) 120 kHz, 213-dB peak-to-peak exposure level (EL)], a midfrequency click modeled after a killer whale’s signal (PF 55 kHz, 208-dB EL), and a low-frequency click (PF 18 kHz, 193-dB EL). Fish were held in a 50-cm diameter net enclosure immediately in front of a transducer where their swimming behavior, orientation, and balance were observed with two video cameras. Clicks were presented at constant rates and in graded sweeps simulating a foraging dolphin’s “terminal buzz.” No measurable change in behavior was observed in any of the fish for any signal type or pulse modulation rate, despite the fact that clicks were at or near the maximum source levels recorded for odontocetes. Based on the results, the hypothesis that acoustic signals of odontocetes alone can disorient or “stun” prey cannot be supported.
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  • J. Acoust. Soc. Am. 120 (2), 1118-1123, DOI: 10.1121/1.2211508
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  • 120
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  • 2
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  • This work was supported by the U.S. Office of Naval Research and the Netherlands Ministry for Agriculture, Nature, and Food Quality _DKW-program 418: North Sea and Coast.
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  • description.provenance : Approved for entry into archive by Kelly Benoit-Bird(kbenoit@coas.oregonstate.edu) on 2009-09-24T17:23:17Z (GMT) No. of bitstreams: 1 JAcoustSociety2006_NoStunningResults.pdf: 136886 bytes, checksum: 73dac4eafd38d5de006ba564d0036c67 (MD5)
  • description.provenance : Submitted by Linda Lamb (llamb@coas.oregonstate.edu) on 2009-09-24T17:19:10Z No. of bitstreams: 1 JAcoustSociety2006_NoStunningResults.pdf: 136886 bytes, checksum: 73dac4eafd38d5de006ba564d0036c67 (MD5)
  • description.provenance : Made available in DSpace on 2009-09-24T17:23:17Z (GMT). No. of bitstreams: 1 JAcoustSociety2006_NoStunningResults.pdf: 136886 bytes, checksum: 73dac4eafd38d5de006ba564d0036c67 (MD5) Previous issue date: 2006-08
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  • 0001-4966

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