The in-air auditory thresholds of the eurasian otter (Lutra lutra, L. 1758) as determined by auditory brainstem responses

Voigt, Mathias Benjamin; Hackenbroich, Christian; Krüger, Hans-Heinrich; Liebau, Arne; Esser, Karl‐Heinz

doi:10.1016/j.heares.2019.107774

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2024

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Cited by 2 publications

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Eurasian Otter Lutra lutra (Linnaeus, 1758)

Loy,

Chanin,

Kranz

et al. 2024

Handbook of the Mammals of Europe

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Eurasian Otter Lutra lutra (Linnaeus, 1758)

Loy,

Chanin,

Kranz

et al. 2024

Handbook of the Mammals of Europe

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Response of Eurasian otters (Lutra lutra) to underwater acoustic harassment device sounds

Stepien,

Galatius,

Hansen

et al. 2024

Sci Rep

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Seal scarers (or acoustic harassment devices, AHDs) are designed to deter seals from fishing gear and aquaculture operations, as well as to prevent seals from entering rivers to avoid predation on valuable fish. Our study investigated the potential effects of AHDs on non-target species, specifically the Eurasian otters (Lutra lutra), by testing the reaction of two rehabilitated otters to simulated AHDs sounds at 1 and 14 kHz, with a received sound intensity of 105–145 dB re 1 µPa rms. The 1 kHz sounds were used to investigate alternative frequencies for scaring seals without scaring otters. The otters reacted to both 1 and 14 kHz tonal signals when retrieving fish from a feeding station 0.8 m below the surface. Their diving behaviour and time to extract food progressively increased as sound intensity increased for all tested sound levels. Notably, the sound levels used in our tests were significantly lower (40–80 dB) than the source levels from commercial AHDs. These findings highlight the importance of caution when using AHDs in river and sea habitats inhabited by otters, as AHDs can change their behaviour and potentially result in habitat exclusion.

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The in-air auditory thresholds of the eurasian otter (Lutra lutra, L. 1758) as determined by auditory brainstem responses

Cited by 2 publications

References 17 publications

Eurasian Otter Lutra lutra (Linnaeus, 1758)

Eurasian Otter Lutra lutra (Linnaeus, 1758)

Response of Eurasian otters (Lutra lutra) to underwater acoustic harassment device sounds

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