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To address this knowledge gap, we used drone video footage recorded from a recreational boat to quantify how harbour porpoises (<jats:italic>Phocoena phocoena<\/jats:italic>) 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\u2013150\u2009kHz) and at the 1\/3 octave 16\u2009kHz frequency band for both experimental speeds. The experiments were carried out in shallow waters near Funen, Denmark (55.51\u00b0\u2009N, 10.79\u00b0\u2009E) 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 (&lt;200\u2009m) to the approaching boat and quickly (&lt;50\u2009s) 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.<\/jats:p>","DOI":"10.1002\/ece3.11433","type":"journal-article","created":{"date-parts":[[2024,5,16]],"date-time":"2024-05-16T05:45:10Z","timestamp":1715838310000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Harbour porpoises respond to recreational boats by speeding up and moving away from the boat path"],"prefix":"10.1002","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3026-0578","authenticated-orcid":false,"given":"Xiuqing","family":"Hao","sequence":"first","affiliation":[{"name":"Department of Ecoscience Aarhus University  Roskilde Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H\u00e9lo\u00efse","family":"Hamel","sequence":"additional","affiliation":[{"name":"Department of Biology University of Southern Denmark  Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C\u00e9line Hagerup","family":"Grandjean","sequence":"additional","affiliation":[{"name":"Department of Biology University of Southern Denmark  Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ivan","family":"Fedutin","sequence":"additional","affiliation":[{"name":"Fjord&amp;B\u00e6lt  Kerteminde Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Magnus","family":"Wahlberg","sequence":"additional","affiliation":[{"name":"Department of Biology University of Southern Denmark  Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caitlin Kim","family":"Frankish","sequence":"additional","affiliation":[{"name":"Norwegian Polar Institute  Troms\u00f8 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacob","family":"Nabe\u2010Nielsen","sequence":"additional","affiliation":[{"name":"Department of Ecoscience Aarhus University  Roskilde Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,5,15]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.3390\/drones7110667"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/mms.12997"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0172970"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.anbehav.2006.04.003"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.fishres.2022.106437"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.32614\/RJ-2017-066"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1214\/ss\/1009213286"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ecolmodel.2006.03.017"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ocecoaman.2021.105693"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1139\/juvs\u20102015\u20100021"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.3389\/fmars.2016.00277"},{"key":"e_1_2_9_13_1","unstructured":"Council Directive 92\/43\/EEC. 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