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Owen, Kylie; Carlström, Julia; Eriksson, Pia; Andersson, Mathias; Nordström, Robin; Lalander, Emilia; Sveegaard, Signe; Kyhn, Line A.; Griffiths, Emily T.; Cosentino, Mel; Tougaard, Jakob
Marine pollution bulletin, 05/2024, Volume: 202Journal Article
Shipping is one of the largest industries globally, with well-known negative impacts on the marine environment. Despite the known negative short-term (minutes to hours) impact of shipping on individual animal behavioural responses, very little is understood about the long-term (months to years) impact on marine species presence and area use. This study took advantage of a planned rerouting of a major shipping lane leading into the Baltic Sea, to investigate the impact on the presence and foraging behaviour of a marine species known to be sensitive to underwater noise, the harbour porpoise (Phocoena phocoena). Passive acoustic monitoring data were collected from 15 stations over two years. Against predictions, no clear change occurred in monthly presence or foraging behaviour of the porpoises, despite the observed changes in noise and vessel traffic. However, long-term heightened noise levels may still impact communication, echolocation, or stress levels of individuals, and needs further investigation. •Elevated shipping noise and vessel traffic did not influence porpoise occurrence.•No change was observed in either detection rate or foraging behaviour of porpoises.•Porpoises continued to use preferred habitat despite changes in underwater noise.•Long-term impacts on communication, echolocation, or stress remain unknown.
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