Habituation to an acoustic harassment device (AHD) by killer whales depredating demersal longlines
Acoustic harassment devices (AHDs) have been increasingly implemented in various fisheries that suffer significant losses caused by odontocete depredation. However, the efficacy of AHDs to deter odontocetes from fishing gear remains poorly investigated. To determine the effectiveness of AHDs in dete...
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ftdeakinunifig:oai:figshare.com:article/20830441 2023-05-15T15:59:34+02:00 Habituation to an acoustic harassment device (AHD) by killer whales depredating demersal longlines Paul Tixier N Gasco G Duhamel C Guinet 2015-06-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30103423 https://figshare.com/articles/journal_contribution/Habituation_to_an_acoustic_harassment_device_AHD_by_killer_whales_depredating_demersal_longlines/20830441 unknown http://hdl.handle.net/10536/DRO/DU:30103423 https://figshare.com/articles/journal_contribution/Habituation_to_an_acoustic_harassment_device_AHD_by_killer_whales_depredating_demersal_longlines/20830441 All Rights Reserved Uncategorized acoustic harassment device AHD depredation killer whales longline fisheries Science & Technology Life Sciences & Biomedicine Physical Sciences Fisheries Marine & Freshwater Biology Oceanography PORPOISES PHOCOENA-PHOCOENA ORCINUS-ORCA SPERM-WHALES PHYSETER-MACROCEPHALUS FISHERY INTERACTIONS BRITISH-COLUMBIA MARINE MAMMALS CROZET CULTURE NOISE Text Journal contribution 2015 ftdeakinunifig 2022-11-17T20:18:25Z Acoustic harassment devices (AHDs) have been increasingly implemented in various fisheries that suffer significant losses caused by odontocete depredation. However, the efficacy of AHDs to deter odontocetes from fishing gear remains poorly investigated. To determine the effectiveness of AHDs in deterring depredation, we experimentally tested a high amplitude device (195 dB re 1 μPa 6.5 kHz 1 m from the source) from a Patagonian toothfish Dissostichus elegenoides longliner operating off the Crozet Islands, while it was subjected to heavy depredation by killer whales Orcinus orca. This species usually depredates longlines within a 10- to 300-m range from the vessel, as they only have access to fishing gear during hauling. We expected this distance to increase in response to the acoustic disturbance created by the AHD. The distances of 29 killer whales from the vessel (n = 1812 records) were collected during phases of AHD activation and phases during which the AHD was turned off. Two multiexposed killer whale social units fled over 700 m away from the vessel when first exposed to the AHD. However, they remained within a 10- to 300-m range and depredated longlines again past the third and seventh exposures, respectively, showing an insignificant behavioural response to further activations of the AHD. When tested through generalized linear mixed models, the effect of AHD activation was only significant when killer whales were first exposed to the device. However, the effect disappeared after successive exposures suggesting that killer whales became habituated to the AHD and may sustain potentially harmful hearing disturbance to access the resource made available by longliners. In addition to raising significant conservation concerns, this rapid return of initial depredation behaviour strongly suggests that AHDs are ineffective at deterring depredating killer whales, and that fisheries should favour the use of other mitigation techniques when facing repeated depredation by this species. Other Non-Article Part of Journal/Newspaper Crozet Islands Killer Whale Orca Orcinus orca Patagonian Toothfish Phocoena phocoena Physeter macrocephalus Killer whale DRO - Deakin Research Online |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Uncategorized acoustic harassment device AHD depredation killer whales longline fisheries Science & Technology Life Sciences & Biomedicine Physical Sciences Fisheries Marine & Freshwater Biology Oceanography PORPOISES PHOCOENA-PHOCOENA ORCINUS-ORCA SPERM-WHALES PHYSETER-MACROCEPHALUS FISHERY INTERACTIONS BRITISH-COLUMBIA MARINE MAMMALS CROZET CULTURE NOISE |
spellingShingle |
Uncategorized acoustic harassment device AHD depredation killer whales longline fisheries Science & Technology Life Sciences & Biomedicine Physical Sciences Fisheries Marine & Freshwater Biology Oceanography PORPOISES PHOCOENA-PHOCOENA ORCINUS-ORCA SPERM-WHALES PHYSETER-MACROCEPHALUS FISHERY INTERACTIONS BRITISH-COLUMBIA MARINE MAMMALS CROZET CULTURE NOISE Paul Tixier N Gasco G Duhamel C Guinet Habituation to an acoustic harassment device (AHD) by killer whales depredating demersal longlines |
topic_facet |
Uncategorized acoustic harassment device AHD depredation killer whales longline fisheries Science & Technology Life Sciences & Biomedicine Physical Sciences Fisheries Marine & Freshwater Biology Oceanography PORPOISES PHOCOENA-PHOCOENA ORCINUS-ORCA SPERM-WHALES PHYSETER-MACROCEPHALUS FISHERY INTERACTIONS BRITISH-COLUMBIA MARINE MAMMALS CROZET CULTURE NOISE |
description |
Acoustic harassment devices (AHDs) have been increasingly implemented in various fisheries that suffer significant losses caused by odontocete depredation. However, the efficacy of AHDs to deter odontocetes from fishing gear remains poorly investigated. To determine the effectiveness of AHDs in deterring depredation, we experimentally tested a high amplitude device (195 dB re 1 μPa 6.5 kHz 1 m from the source) from a Patagonian toothfish Dissostichus elegenoides longliner operating off the Crozet Islands, while it was subjected to heavy depredation by killer whales Orcinus orca. This species usually depredates longlines within a 10- to 300-m range from the vessel, as they only have access to fishing gear during hauling. We expected this distance to increase in response to the acoustic disturbance created by the AHD. The distances of 29 killer whales from the vessel (n = 1812 records) were collected during phases of AHD activation and phases during which the AHD was turned off. Two multiexposed killer whale social units fled over 700 m away from the vessel when first exposed to the AHD. However, they remained within a 10- to 300-m range and depredated longlines again past the third and seventh exposures, respectively, showing an insignificant behavioural response to further activations of the AHD. When tested through generalized linear mixed models, the effect of AHD activation was only significant when killer whales were first exposed to the device. However, the effect disappeared after successive exposures suggesting that killer whales became habituated to the AHD and may sustain potentially harmful hearing disturbance to access the resource made available by longliners. In addition to raising significant conservation concerns, this rapid return of initial depredation behaviour strongly suggests that AHDs are ineffective at deterring depredating killer whales, and that fisheries should favour the use of other mitigation techniques when facing repeated depredation by this species. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Paul Tixier N Gasco G Duhamel C Guinet |
author_facet |
Paul Tixier N Gasco G Duhamel C Guinet |
author_sort |
Paul Tixier |
title |
Habituation to an acoustic harassment device (AHD) by killer whales depredating demersal longlines |
title_short |
Habituation to an acoustic harassment device (AHD) by killer whales depredating demersal longlines |
title_full |
Habituation to an acoustic harassment device (AHD) by killer whales depredating demersal longlines |
title_fullStr |
Habituation to an acoustic harassment device (AHD) by killer whales depredating demersal longlines |
title_full_unstemmed |
Habituation to an acoustic harassment device (AHD) by killer whales depredating demersal longlines |
title_sort |
habituation to an acoustic harassment device (ahd) by killer whales depredating demersal longlines |
publishDate |
2015 |
url |
http://hdl.handle.net/10536/DRO/DU:30103423 https://figshare.com/articles/journal_contribution/Habituation_to_an_acoustic_harassment_device_AHD_by_killer_whales_depredating_demersal_longlines/20830441 |
genre |
Crozet Islands Killer Whale Orca Orcinus orca Patagonian Toothfish Phocoena phocoena Physeter macrocephalus Killer whale |
genre_facet |
Crozet Islands Killer Whale Orca Orcinus orca Patagonian Toothfish Phocoena phocoena Physeter macrocephalus Killer whale |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30103423 https://figshare.com/articles/journal_contribution/Habituation_to_an_acoustic_harassment_device_AHD_by_killer_whales_depredating_demersal_longlines/20830441 |
op_rights |
All Rights Reserved |
_version_ |
1766395512039145472 |