Behavioural Responses of Humpback Whales (Megaptera novaeangliae) to Two Acoustic Deterrent Devices in a Northern Feeding Ground off Iceland
Mitigating cetacean entanglement in fishing gear is of global interest, and strategies include the use of acoustic deterrent devices to warn whales of fishing gear. For baleen whales, responses to these devices are poorly understood. This behavioural response study compared the behaviour of humpback...
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ftsydanskunivpub:oai:sdu.dk:publications/88b32db3-f62b-4e76-b40e-3431093463d5 2024-09-15T17:57:30+00:00 Behavioural Responses of Humpback Whales (Megaptera novaeangliae) to Two Acoustic Deterrent Devices in a Northern Feeding Ground off Iceland Basran, Charla J. Woelfing, Benno Neumann, Charlotte Rasmussen, Marianne H. 2020 https://portal.findresearcher.sdu.dk/da/publications/88b32db3-f62b-4e76-b40e-3431093463d5 https://doi.org/10.1578/AM.46.6.2020.584 eng eng https://portal.findresearcher.sdu.dk/da/publications/88b32db3-f62b-4e76-b40e-3431093463d5 info:eu-repo/semantics/closedAccess Basran , C J , Woelfing , B , Neumann , C & Rasmussen , M H 2020 , ' Behavioural Responses of Humpback Whales (Megaptera novaeangliae) to Two Acoustic Deterrent Devices in a Northern Feeding Ground off Iceland ' , Aquatic Mammals , vol. 46 , no. 6 , pp. 584-602 . https://doi.org/10.1578/AM.46.6.2020.584 acoustic deterrent device behavioural response entanglement humpback whale Iceland Megaptera novaeangliae article 2020 ftsydanskunivpub https://doi.org/10.1578/AM.46.6.2020.584 2024-08-05T23:48:16Z Mitigating cetacean entanglement in fishing gear is of global interest, and strategies include the use of acoustic deterrent devices to warn whales of fishing gear. For baleen whales, responses to these devices are poorly understood. This behavioural response study compared the behaviour of humpback whales (Megaptera novaeangliae) in their feeding grounds off Iceland prior to, during, and after exposure to a whale pinger (Future Oceans: 3 kHz, n = 9 exposures) and a seal scarer (Lofitech AS Ltd.: 10 to 20 kHz, n = 7 exposures) using boatbased focal follows. Linear mixed effects models and binary generalized linear mixed effects models were used to analyze the effect of the devices on breathing rate, dive time, swimming speed, swimming directness, and surface feeding. There was a significant increase in swimming speed and a significant decrease in observed surface feeding during whale pinger exposures. There were no sig-nificant behavioural changes that were consistent across individuals during seal scarer exposures. In addition to experimental exposure trials, a field trial of whale pingers on a capelin purse seine was conducted. During this trial, humpback whales were observed entering the net from the bottom while the whale pingers were attached at the top, but the encircled whales were able to locate an opening free of pingers and escape without damaging the net. All in all, the results suggest pingers can be a useful entanglement mitigation tool in humpback whale feeding grounds given that a reduction in feeding around nets likely reduces the risk of whales swimming through them. Furthermore, the use of pingers may also reduce net damage by guiding encircled whales to a pinger-free opening. However, given the observed behavioural changes that may lead to fitness consequences if exposure to pingers is frequent, whale pingers are most advisable for short-term use in conjunction with other entanglement mitigation measures. Article in Journal/Newspaper baleen whales Humpback Whale Iceland Megaptera novaeangliae University of Southern Denmark Research Portal Aquatic Mammals 46 6 584 602 |
institution |
Open Polar |
collection |
University of Southern Denmark Research Portal |
op_collection_id |
ftsydanskunivpub |
language |
English |
topic |
acoustic deterrent device behavioural response entanglement humpback whale Iceland Megaptera novaeangliae |
spellingShingle |
acoustic deterrent device behavioural response entanglement humpback whale Iceland Megaptera novaeangliae Basran, Charla J. Woelfing, Benno Neumann, Charlotte Rasmussen, Marianne H. Behavioural Responses of Humpback Whales (Megaptera novaeangliae) to Two Acoustic Deterrent Devices in a Northern Feeding Ground off Iceland |
topic_facet |
acoustic deterrent device behavioural response entanglement humpback whale Iceland Megaptera novaeangliae |
description |
Mitigating cetacean entanglement in fishing gear is of global interest, and strategies include the use of acoustic deterrent devices to warn whales of fishing gear. For baleen whales, responses to these devices are poorly understood. This behavioural response study compared the behaviour of humpback whales (Megaptera novaeangliae) in their feeding grounds off Iceland prior to, during, and after exposure to a whale pinger (Future Oceans: 3 kHz, n = 9 exposures) and a seal scarer (Lofitech AS Ltd.: 10 to 20 kHz, n = 7 exposures) using boatbased focal follows. Linear mixed effects models and binary generalized linear mixed effects models were used to analyze the effect of the devices on breathing rate, dive time, swimming speed, swimming directness, and surface feeding. There was a significant increase in swimming speed and a significant decrease in observed surface feeding during whale pinger exposures. There were no sig-nificant behavioural changes that were consistent across individuals during seal scarer exposures. In addition to experimental exposure trials, a field trial of whale pingers on a capelin purse seine was conducted. During this trial, humpback whales were observed entering the net from the bottom while the whale pingers were attached at the top, but the encircled whales were able to locate an opening free of pingers and escape without damaging the net. All in all, the results suggest pingers can be a useful entanglement mitigation tool in humpback whale feeding grounds given that a reduction in feeding around nets likely reduces the risk of whales swimming through them. Furthermore, the use of pingers may also reduce net damage by guiding encircled whales to a pinger-free opening. However, given the observed behavioural changes that may lead to fitness consequences if exposure to pingers is frequent, whale pingers are most advisable for short-term use in conjunction with other entanglement mitigation measures. |
format |
Article in Journal/Newspaper |
author |
Basran, Charla J. Woelfing, Benno Neumann, Charlotte Rasmussen, Marianne H. |
author_facet |
Basran, Charla J. Woelfing, Benno Neumann, Charlotte Rasmussen, Marianne H. |
author_sort |
Basran, Charla J. |
title |
Behavioural Responses of Humpback Whales (Megaptera novaeangliae) to Two Acoustic Deterrent Devices in a Northern Feeding Ground off Iceland |
title_short |
Behavioural Responses of Humpback Whales (Megaptera novaeangliae) to Two Acoustic Deterrent Devices in a Northern Feeding Ground off Iceland |
title_full |
Behavioural Responses of Humpback Whales (Megaptera novaeangliae) to Two Acoustic Deterrent Devices in a Northern Feeding Ground off Iceland |
title_fullStr |
Behavioural Responses of Humpback Whales (Megaptera novaeangliae) to Two Acoustic Deterrent Devices in a Northern Feeding Ground off Iceland |
title_full_unstemmed |
Behavioural Responses of Humpback Whales (Megaptera novaeangliae) to Two Acoustic Deterrent Devices in a Northern Feeding Ground off Iceland |
title_sort |
behavioural responses of humpback whales (megaptera novaeangliae) to two acoustic deterrent devices in a northern feeding ground off iceland |
publishDate |
2020 |
url |
https://portal.findresearcher.sdu.dk/da/publications/88b32db3-f62b-4e76-b40e-3431093463d5 https://doi.org/10.1578/AM.46.6.2020.584 |
genre |
baleen whales Humpback Whale Iceland Megaptera novaeangliae |
genre_facet |
baleen whales Humpback Whale Iceland Megaptera novaeangliae |
op_source |
Basran , C J , Woelfing , B , Neumann , C & Rasmussen , M H 2020 , ' Behavioural Responses of Humpback Whales (Megaptera novaeangliae) to Two Acoustic Deterrent Devices in a Northern Feeding Ground off Iceland ' , Aquatic Mammals , vol. 46 , no. 6 , pp. 584-602 . https://doi.org/10.1578/AM.46.6.2020.584 |
op_relation |
https://portal.findresearcher.sdu.dk/da/publications/88b32db3-f62b-4e76-b40e-3431093463d5 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1578/AM.46.6.2020.584 |
container_title |
Aquatic Mammals |
container_volume |
46 |
container_issue |
6 |
container_start_page |
584 |
op_container_end_page |
602 |
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1810433648805019648 |