False killer whale (Pseudorca crassidens) echolocation and acoustic disruption: implications for longline bycatch and depredation
False killer whales ( Pseudorca crassidens (Owen, 1846)) depredate fish caught by the North Pacific pelagic longline fishery, resulting in loss of target species catch and the whales themselves becoming bycaught. This incidental take of false killer whales exceeds sustainable levels. In an effort to...
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crcansciencepubl:10.1139/z09-061 2024-04-28T08:27:20+00:00 False killer whale (Pseudorca crassidens) echolocation and acoustic disruption: implications for longline bycatch and depredation Mooney, T. A. Pacini, A. F. Nachtigall, P. E. 2009 http://dx.doi.org/10.1139/z09-061 http://www.nrcresearchpress.com/doi/full-xml/10.1139/Z09-061 http://www.nrcresearchpress.com/doi/pdf/10.1139/Z09-061 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 87, issue 8, page 726-733 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2009 crcansciencepubl https://doi.org/10.1139/z09-061 2024-04-02T06:55:54Z False killer whales ( Pseudorca crassidens (Owen, 1846)) depredate fish caught by the North Pacific pelagic longline fishery, resulting in loss of target species catch and the whales themselves becoming bycaught. This incidental take of false killer whales exceeds sustainable levels. In an effort to address a potential solution to reducing this depredation and bycatch, we tested an acoustic device designed to deter false killer whales from approaching longlines by reducing the whales’ echolocation performance capabilities. The device produced a series of complex, broadband signals (1–250 kHz) at high intensity levels (up to 182 dB). In the experiment, a trained false killer whale was asked to detect a target in the presence or absence of the acoustic device. Baseline performance capabilities were 95% correct responses. Initially, the device reduced the whale’s echolocation performance to chance levels. However, subsequent sessions demonstrated improvement in echolocation performance up to 85%. This improvement was likely a result of behaviorally adapting to the task and a decrease in the source level of the echolocation “disruptor”. The results underscore the challenges in using acoustic devices to reduce depredation and bycatch, and demonstrate the need for concern regarding anthropogenic noise levels and effects on odontocete echolocation capabilities. Article in Journal/Newspaper Killer Whale Canadian Science Publishing Canadian Journal of Zoology 87 8 726 733 |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Mooney, T. A. Pacini, A. F. Nachtigall, P. E. False killer whale (Pseudorca crassidens) echolocation and acoustic disruption: implications for longline bycatch and depredation |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
False killer whales ( Pseudorca crassidens (Owen, 1846)) depredate fish caught by the North Pacific pelagic longline fishery, resulting in loss of target species catch and the whales themselves becoming bycaught. This incidental take of false killer whales exceeds sustainable levels. In an effort to address a potential solution to reducing this depredation and bycatch, we tested an acoustic device designed to deter false killer whales from approaching longlines by reducing the whales’ echolocation performance capabilities. The device produced a series of complex, broadband signals (1–250 kHz) at high intensity levels (up to 182 dB). In the experiment, a trained false killer whale was asked to detect a target in the presence or absence of the acoustic device. Baseline performance capabilities were 95% correct responses. Initially, the device reduced the whale’s echolocation performance to chance levels. However, subsequent sessions demonstrated improvement in echolocation performance up to 85%. This improvement was likely a result of behaviorally adapting to the task and a decrease in the source level of the echolocation “disruptor”. The results underscore the challenges in using acoustic devices to reduce depredation and bycatch, and demonstrate the need for concern regarding anthropogenic noise levels and effects on odontocete echolocation capabilities. |
format |
Article in Journal/Newspaper |
author |
Mooney, T. A. Pacini, A. F. Nachtigall, P. E. |
author_facet |
Mooney, T. A. Pacini, A. F. Nachtigall, P. E. |
author_sort |
Mooney, T. A. |
title |
False killer whale (Pseudorca crassidens) echolocation and acoustic disruption: implications for longline bycatch and depredation |
title_short |
False killer whale (Pseudorca crassidens) echolocation and acoustic disruption: implications for longline bycatch and depredation |
title_full |
False killer whale (Pseudorca crassidens) echolocation and acoustic disruption: implications for longline bycatch and depredation |
title_fullStr |
False killer whale (Pseudorca crassidens) echolocation and acoustic disruption: implications for longline bycatch and depredation |
title_full_unstemmed |
False killer whale (Pseudorca crassidens) echolocation and acoustic disruption: implications for longline bycatch and depredation |
title_sort |
false killer whale (pseudorca crassidens) echolocation and acoustic disruption: implications for longline bycatch and depredation |
publisher |
Canadian Science Publishing |
publishDate |
2009 |
url |
http://dx.doi.org/10.1139/z09-061 http://www.nrcresearchpress.com/doi/full-xml/10.1139/Z09-061 http://www.nrcresearchpress.com/doi/pdf/10.1139/Z09-061 |
genre |
Killer Whale |
genre_facet |
Killer Whale |
op_source |
Canadian Journal of Zoology volume 87, issue 8, page 726-733 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z09-061 |
container_title |
Canadian Journal of Zoology |
container_volume |
87 |
container_issue |
8 |
container_start_page |
726 |
op_container_end_page |
733 |
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1797586342604963840 |