Harbour porpoises respond to recreational boats by speeding up and moving away from the boat path
Abstract Recreational boats are common in many coastal waters, yet their effects on cetaceans and other sensitive marine species remain poorly understood. To address this knowledge gap, we used drone video footage recorded from a recreational boat to quantify how harbour porpoises ( Phocoena phocoen...
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Online Access: | http://dx.doi.org/10.1002/ece3.11433 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.11433 |
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crwiley:10.1002/ece3.11433 2024-10-13T14:10:18+00:00 Harbour porpoises respond to recreational boats by speeding up and moving away from the boat path Hao, Xiuqing Hamel, Héloïse Grandjean, Céline Hagerup Fedutin, Ivan Wahlberg, Magnus Frankish, Caitlin Kim Nabe‐Nielsen, Jacob Horizon 2020 Framework Programme China Scholarship Council Aarhus Universitet 2024 http://dx.doi.org/10.1002/ece3.11433 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.11433 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Ecology and Evolution volume 14, issue 5 ISSN 2045-7758 2045-7758 journal-article 2024 crwiley https://doi.org/10.1002/ece3.11433 2024-09-19T04:19:50Z Abstract Recreational boats are common in many coastal waters, yet their effects on cetaceans and other sensitive marine species remain poorly understood. To address this knowledge gap, we used drone video footage recorded from a recreational boat to quantify how harbour porpoises ( Phocoena phocoena ) responded to the boat approaching at different speeds (10 or 20 knots). Furthermore, we used a hydrophone to record boat noise levels at full bandwidth (0.1–150 kHz) and at the 1/3 octave 16 kHz frequency band for both experimental speeds. The experiments were carried out in shallow waters near Funen, Denmark (55.51° N, 10.79° E) between July and September 2022. Porpoises were more likely to move further away from the path of the boat when approached at 10 knots, but not when approached at 20 knots. In contrast, they swam faster when approached at 20 knots, but not when approached at 10 knots. The recorded received sound level did not depend on how fast the boat approached, suggesting that differences in porpoise responses were related to the speed of the approaching boat rather than to sound intensity. In addition, porpoises generally reacted within close proximity (<200 m) to the approaching boat and quickly (<50 s) resumed their natural behaviour once the boat had passed, indicating that the direct impact of small vessels on porpoise behaviour was most likely small. Nevertheless, repeated exposure to noise from small vessels may influence porpoises' activity or energy budget, and cause them to relocate from disturbed areas. The approach used in this study increases our understanding of recreational boats' impact on harbour porpoises and can be used to inform efficient mitigation measures to help focus conservation efforts. Article in Journal/Newspaper Phocoena phocoena Wiley Online Library Ecology and Evolution 14 5 |
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English |
description |
Abstract Recreational boats are common in many coastal waters, yet their effects on cetaceans and other sensitive marine species remain poorly understood. To address this knowledge gap, we used drone video footage recorded from a recreational boat to quantify how harbour porpoises ( Phocoena phocoena ) responded to the boat approaching at different speeds (10 or 20 knots). Furthermore, we used a hydrophone to record boat noise levels at full bandwidth (0.1–150 kHz) and at the 1/3 octave 16 kHz frequency band for both experimental speeds. The experiments were carried out in shallow waters near Funen, Denmark (55.51° N, 10.79° E) between July and September 2022. Porpoises were more likely to move further away from the path of the boat when approached at 10 knots, but not when approached at 20 knots. In contrast, they swam faster when approached at 20 knots, but not when approached at 10 knots. The recorded received sound level did not depend on how fast the boat approached, suggesting that differences in porpoise responses were related to the speed of the approaching boat rather than to sound intensity. In addition, porpoises generally reacted within close proximity (<200 m) to the approaching boat and quickly (<50 s) resumed their natural behaviour once the boat had passed, indicating that the direct impact of small vessels on porpoise behaviour was most likely small. Nevertheless, repeated exposure to noise from small vessels may influence porpoises' activity or energy budget, and cause them to relocate from disturbed areas. The approach used in this study increases our understanding of recreational boats' impact on harbour porpoises and can be used to inform efficient mitigation measures to help focus conservation efforts. |
author2 |
Horizon 2020 Framework Programme China Scholarship Council Aarhus Universitet |
format |
Article in Journal/Newspaper |
author |
Hao, Xiuqing Hamel, Héloïse Grandjean, Céline Hagerup Fedutin, Ivan Wahlberg, Magnus Frankish, Caitlin Kim Nabe‐Nielsen, Jacob |
spellingShingle |
Hao, Xiuqing Hamel, Héloïse Grandjean, Céline Hagerup Fedutin, Ivan Wahlberg, Magnus Frankish, Caitlin Kim Nabe‐Nielsen, Jacob Harbour porpoises respond to recreational boats by speeding up and moving away from the boat path |
author_facet |
Hao, Xiuqing Hamel, Héloïse Grandjean, Céline Hagerup Fedutin, Ivan Wahlberg, Magnus Frankish, Caitlin Kim Nabe‐Nielsen, Jacob |
author_sort |
Hao, Xiuqing |
title |
Harbour porpoises respond to recreational boats by speeding up and moving away from the boat path |
title_short |
Harbour porpoises respond to recreational boats by speeding up and moving away from the boat path |
title_full |
Harbour porpoises respond to recreational boats by speeding up and moving away from the boat path |
title_fullStr |
Harbour porpoises respond to recreational boats by speeding up and moving away from the boat path |
title_full_unstemmed |
Harbour porpoises respond to recreational boats by speeding up and moving away from the boat path |
title_sort |
harbour porpoises respond to recreational boats by speeding up and moving away from the boat path |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1002/ece3.11433 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.11433 |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Ecology and Evolution volume 14, issue 5 ISSN 2045-7758 2045-7758 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ece3.11433 |
container_title |
Ecology and Evolution |
container_volume |
14 |
container_issue |
5 |
_version_ |
1812817510820478976 |