Image_4_Assessing the Effects of Banana Pingers as a Bycatch Mitigation Device for Harbour Porpoises (Phocoena phocoena).pdf
Bycatch is a significant cause of population declines of marine megafauna globally. While numerous bycatch mitigation strategies exist, acoustic alarms, or pingers, are the most widely adopted strategy for small cetaceans. Although pingers have been shown to be an effective measure for numerous spec...
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Online Access: | https://doi.org/10.3389/fmars.2020.00285.s004 https://figshare.com/articles/Image_4_Assessing_the_Effects_of_Banana_Pingers_as_a_Bycatch_Mitigation_Device_for_Harbour_Porpoises_Phocoena_phocoena_pdf/12292085 |
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ftfrontimediafig:oai:figshare.com:article/12292085 2023-05-15T16:33:21+02:00 Image_4_Assessing the Effects of Banana Pingers as a Bycatch Mitigation Device for Harbour Porpoises (Phocoena phocoena).pdf Lucy C. M. Omeyer Philip D. Doherty Sarah Dolman Robert Enever Allan Reese Nicholas Tregenza Ruth Williams Brendan J. Godley 2020-05-13T04:02:36Z https://doi.org/10.3389/fmars.2020.00285.s004 https://figshare.com/articles/Image_4_Assessing_the_Effects_of_Banana_Pingers_as_a_Bycatch_Mitigation_Device_for_Harbour_Porpoises_Phocoena_phocoena_pdf/12292085 unknown doi:10.3389/fmars.2020.00285.s004 https://figshare.com/articles/Image_4_Assessing_the_Effects_of_Banana_Pingers_as_a_Bycatch_Mitigation_Device_for_Harbour_Porpoises_Phocoena_phocoena_pdf/12292085 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering acoustic deterrent C-POD cetacean marine mammal passive acoustic monitoring Image Figure 2020 ftfrontimediafig https://doi.org/10.3389/fmars.2020.00285.s004 2020-05-13T22:53:20Z Bycatch is a significant cause of population declines of marine megafauna globally. While numerous bycatch mitigation strategies exist, acoustic alarms, or pingers, are the most widely adopted strategy for small cetaceans. Although pingers have been shown to be an effective measure for numerous species, there are some concerns about their long-term use. Bycatch is recognized as a persistent problem in waters around Cornwall, United Kingdom, where several cetacean species are resident, with harbour porpoises (Phocoena phocoena) being the most-commonly sighted. In this study, we assessed the effects of a Banana Pinger (Fishtek Marine Limited) on harbour porpoises in Cornwall between August 2012 and March 2013. Two passive acoustic loggers (C-PODs; Chelonia Limited) were deployed 100 m apart to record cetacean activity during cycles of active and inactive pinger periods. Harbour porpoises were 37% less likely to be detected at the C-POD near the pinger when the pinger was active, while they were only 9% less likely to be detected 100 m further away. The effect of the pinger was constant over the study period at both C-PODs despite the temporal variation in harbour porpoise detections. In addition, we found no evidence of reduced pinger effect with changing environmental conditions. Furthermore, harbour porpoise detections at the C-POD near the pinger did not depend on the time elapsed since the pinger turned off, with harbour porpoises returning to the ensonified area with no delay. Together these results suggest that (1) harbour porpoises did not habituate to the pinger over an 8-month period, (2) the pinger effect is very localized, and (3) pinger use did not lead to harbour porpoise displacement over the study period, suggesting an absence of long-term behavioral effects. We suggest that the deployment of pingers on fishing nets would likely reduce net-porpoise interactions, thereby mitigating bycatch of harbour porpoises and potentially other cetacean species. As the small-scale fishery dominates in United ... Still Image Harbour porpoise Phocoena phocoena Frontiers: Figshare Cornwall ENVELOPE(-59.688,-59.688,-62.366,-62.366) |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering acoustic deterrent C-POD cetacean marine mammal passive acoustic monitoring |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering acoustic deterrent C-POD cetacean marine mammal passive acoustic monitoring Lucy C. M. Omeyer Philip D. Doherty Sarah Dolman Robert Enever Allan Reese Nicholas Tregenza Ruth Williams Brendan J. Godley Image_4_Assessing the Effects of Banana Pingers as a Bycatch Mitigation Device for Harbour Porpoises (Phocoena phocoena).pdf |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering acoustic deterrent C-POD cetacean marine mammal passive acoustic monitoring |
description |
Bycatch is a significant cause of population declines of marine megafauna globally. While numerous bycatch mitigation strategies exist, acoustic alarms, or pingers, are the most widely adopted strategy for small cetaceans. Although pingers have been shown to be an effective measure for numerous species, there are some concerns about their long-term use. Bycatch is recognized as a persistent problem in waters around Cornwall, United Kingdom, where several cetacean species are resident, with harbour porpoises (Phocoena phocoena) being the most-commonly sighted. In this study, we assessed the effects of a Banana Pinger (Fishtek Marine Limited) on harbour porpoises in Cornwall between August 2012 and March 2013. Two passive acoustic loggers (C-PODs; Chelonia Limited) were deployed 100 m apart to record cetacean activity during cycles of active and inactive pinger periods. Harbour porpoises were 37% less likely to be detected at the C-POD near the pinger when the pinger was active, while they were only 9% less likely to be detected 100 m further away. The effect of the pinger was constant over the study period at both C-PODs despite the temporal variation in harbour porpoise detections. In addition, we found no evidence of reduced pinger effect with changing environmental conditions. Furthermore, harbour porpoise detections at the C-POD near the pinger did not depend on the time elapsed since the pinger turned off, with harbour porpoises returning to the ensonified area with no delay. Together these results suggest that (1) harbour porpoises did not habituate to the pinger over an 8-month period, (2) the pinger effect is very localized, and (3) pinger use did not lead to harbour porpoise displacement over the study period, suggesting an absence of long-term behavioral effects. We suggest that the deployment of pingers on fishing nets would likely reduce net-porpoise interactions, thereby mitigating bycatch of harbour porpoises and potentially other cetacean species. As the small-scale fishery dominates in United ... |
format |
Still Image |
author |
Lucy C. M. Omeyer Philip D. Doherty Sarah Dolman Robert Enever Allan Reese Nicholas Tregenza Ruth Williams Brendan J. Godley |
author_facet |
Lucy C. M. Omeyer Philip D. Doherty Sarah Dolman Robert Enever Allan Reese Nicholas Tregenza Ruth Williams Brendan J. Godley |
author_sort |
Lucy C. M. Omeyer |
title |
Image_4_Assessing the Effects of Banana Pingers as a Bycatch Mitigation Device for Harbour Porpoises (Phocoena phocoena).pdf |
title_short |
Image_4_Assessing the Effects of Banana Pingers as a Bycatch Mitigation Device for Harbour Porpoises (Phocoena phocoena).pdf |
title_full |
Image_4_Assessing the Effects of Banana Pingers as a Bycatch Mitigation Device for Harbour Porpoises (Phocoena phocoena).pdf |
title_fullStr |
Image_4_Assessing the Effects of Banana Pingers as a Bycatch Mitigation Device for Harbour Porpoises (Phocoena phocoena).pdf |
title_full_unstemmed |
Image_4_Assessing the Effects of Banana Pingers as a Bycatch Mitigation Device for Harbour Porpoises (Phocoena phocoena).pdf |
title_sort |
image_4_assessing the effects of banana pingers as a bycatch mitigation device for harbour porpoises (phocoena phocoena).pdf |
publishDate |
2020 |
url |
https://doi.org/10.3389/fmars.2020.00285.s004 https://figshare.com/articles/Image_4_Assessing_the_Effects_of_Banana_Pingers_as_a_Bycatch_Mitigation_Device_for_Harbour_Porpoises_Phocoena_phocoena_pdf/12292085 |
long_lat |
ENVELOPE(-59.688,-59.688,-62.366,-62.366) |
geographic |
Cornwall |
geographic_facet |
Cornwall |
genre |
Harbour porpoise Phocoena phocoena |
genre_facet |
Harbour porpoise Phocoena phocoena |
op_relation |
doi:10.3389/fmars.2020.00285.s004 https://figshare.com/articles/Image_4_Assessing_the_Effects_of_Banana_Pingers_as_a_Bycatch_Mitigation_Device_for_Harbour_Porpoises_Phocoena_phocoena_pdf/12292085 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2020.00285.s004 |
_version_ |
1766023045977210880 |