Swimming patterns of wild harbour porpoises (Phocoena phocoena) show detection and avoidance of gill nets at very long ranges
Harbour porpoises Phocoena phocoena are unintentionally caught in gillnets. Although the effectiveness of by-catch mitigation measures has been evaluated many times, only a few studies have investigated the behavioural patterns of the porpoises in relation to the presence of fishing nets. In this st...
Published in: | Marine Ecology Progress Series |
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Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2012
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Online Access: | https://portal.findresearcher.sdu.dk/da/publications/e759a0fb-6bc6-4068-84a4-0d25ca6d02ad https://doi.org/10.3354/meps09630 |
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ftsydanskunivpub:oai:sdu.dk:publications/e759a0fb-6bc6-4068-84a4-0d25ca6d02ad 2024-05-19T07:47:22+00:00 Swimming patterns of wild harbour porpoises (Phocoena phocoena) show detection and avoidance of gill nets at very long ranges Nielsen, Torben Wahlberg, Magnus Heikillä, Sanja Jensen, Maria Faxe Sabinsky, Puk Dabelsteen, Torben 2012 https://portal.findresearcher.sdu.dk/da/publications/e759a0fb-6bc6-4068-84a4-0d25ca6d02ad https://doi.org/10.3354/meps09630 eng eng https://portal.findresearcher.sdu.dk/da/publications/e759a0fb-6bc6-4068-84a4-0d25ca6d02ad info:eu-repo/semantics/closedAccess Nielsen , T , Wahlberg , M , Heikillä , S , Jensen , M , Faxe Sabinsky , P & Dabelsteen , T 2012 , ' Swimming patterns of wild harbour porpoises (Phocoena phocoena) show detection and avoidance of gill nets at very long ranges ' , Marine Ecology - Progress Series , vol. 453 , pp. 241-248 . https://doi.org/10.3354/meps09630 article 2012 ftsydanskunivpub https://doi.org/10.3354/meps09630 2024-04-24T00:23:44Z Harbour porpoises Phocoena phocoena are unintentionally caught in gillnets. Although the effectiveness of by-catch mitigation measures has been evaluated many times, only a few studies have investigated the behavioural patterns of the porpoises in relation to the presence of fishing nets. In this study, the reactions of wild harbour porpoises to a modified gillnet were visually observed. The porpoises responded to the net by avoiding it, with reactions being detectable at a distance of >80 m. The number of animals in the pods approaching the net did not affect the behaviour of individuals in relation to the net. These results strongly indicate that porpoises do not usually actively approach gillnets. The by-catch problem seems, therefore, to be caused by individual animals accidentally being caught, likely due to attention shifts or to auditory masking reducing their ability to detect the nets using echolocation. Article in Journal/Newspaper Phocoena phocoena University of Southern Denmark Research Portal Marine Ecology Progress Series 453 241 248 |
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Open Polar |
collection |
University of Southern Denmark Research Portal |
op_collection_id |
ftsydanskunivpub |
language |
English |
description |
Harbour porpoises Phocoena phocoena are unintentionally caught in gillnets. Although the effectiveness of by-catch mitigation measures has been evaluated many times, only a few studies have investigated the behavioural patterns of the porpoises in relation to the presence of fishing nets. In this study, the reactions of wild harbour porpoises to a modified gillnet were visually observed. The porpoises responded to the net by avoiding it, with reactions being detectable at a distance of >80 m. The number of animals in the pods approaching the net did not affect the behaviour of individuals in relation to the net. These results strongly indicate that porpoises do not usually actively approach gillnets. The by-catch problem seems, therefore, to be caused by individual animals accidentally being caught, likely due to attention shifts or to auditory masking reducing their ability to detect the nets using echolocation. |
format |
Article in Journal/Newspaper |
author |
Nielsen, Torben Wahlberg, Magnus Heikillä, Sanja Jensen, Maria Faxe Sabinsky, Puk Dabelsteen, Torben |
spellingShingle |
Nielsen, Torben Wahlberg, Magnus Heikillä, Sanja Jensen, Maria Faxe Sabinsky, Puk Dabelsteen, Torben Swimming patterns of wild harbour porpoises (Phocoena phocoena) show detection and avoidance of gill nets at very long ranges |
author_facet |
Nielsen, Torben Wahlberg, Magnus Heikillä, Sanja Jensen, Maria Faxe Sabinsky, Puk Dabelsteen, Torben |
author_sort |
Nielsen, Torben |
title |
Swimming patterns of wild harbour porpoises (Phocoena phocoena) show detection and avoidance of gill nets at very long ranges |
title_short |
Swimming patterns of wild harbour porpoises (Phocoena phocoena) show detection and avoidance of gill nets at very long ranges |
title_full |
Swimming patterns of wild harbour porpoises (Phocoena phocoena) show detection and avoidance of gill nets at very long ranges |
title_fullStr |
Swimming patterns of wild harbour porpoises (Phocoena phocoena) show detection and avoidance of gill nets at very long ranges |
title_full_unstemmed |
Swimming patterns of wild harbour porpoises (Phocoena phocoena) show detection and avoidance of gill nets at very long ranges |
title_sort |
swimming patterns of wild harbour porpoises (phocoena phocoena) show detection and avoidance of gill nets at very long ranges |
publishDate |
2012 |
url |
https://portal.findresearcher.sdu.dk/da/publications/e759a0fb-6bc6-4068-84a4-0d25ca6d02ad https://doi.org/10.3354/meps09630 |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Nielsen , T , Wahlberg , M , Heikillä , S , Jensen , M , Faxe Sabinsky , P & Dabelsteen , T 2012 , ' Swimming patterns of wild harbour porpoises (Phocoena phocoena) show detection and avoidance of gill nets at very long ranges ' , Marine Ecology - Progress Series , vol. 453 , pp. 241-248 . https://doi.org/10.3354/meps09630 |
op_relation |
https://portal.findresearcher.sdu.dk/da/publications/e759a0fb-6bc6-4068-84a4-0d25ca6d02ad |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.3354/meps09630 |
container_title |
Marine Ecology Progress Series |
container_volume |
453 |
container_start_page |
241 |
op_container_end_page |
248 |
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1799487762668191744 |