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Long-term sound and movement recording tags to study natural behavior and reaction to ship noise of seals

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Author(s)

Lonnie Mikkelsen, Mark Johnson, Danuta Maria Wisniewska, Abbo van Neer, Ursula Siebert, Peter Teglberg Madsen, Jonas Teilmann

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Abstract

1.  The impact of anthropogenic noise on marine fauna is of increasing conservation concern with vessel noise being one of the major contributors. Animals that rely on shallow coastal habitats may be especially vulnerable to this form of pollution.
2.  Very limited information is available on how much noise from ship traffic individual animals experience, and how they may react to it due to a lack of suitable methods. To address this, we developed long-duration audio and 3D-movement tags (DTAGs) and deployed them on three harbor seals and two gray seals in the North Sea during 2015-2016.
3. These tags recorded sound, accelerometry, magnetometry, and pressure continuously for up to 21 days. GPS positions were also sampled for one seal continuously throughout the recording period. A separate tag, combining a camera and an accelerometer logger, was deployed on two harbor seals to visualize specific behaviors that helped interpret accelerometer signals in the DTAG data.

4.  Combining data from depth, accelerometer, and audio sensors, we found that animals spent 6.6%-42.3% of the time hauled out (either on land or partly submerged), and 5.3%-12.4% of their at-sea time resting at the sea bottom, while the remaining time was used for traveling, resting at surface, and foraging. Animals were exposed to audible vessel noise 2.2%-20.5% of their time when in water, and we demonstrate that interruption of functional behaviors (e.g., resting) in some cases coincides with high-level vessel noise. Two-thirds of the ship noise events were traceable by the AIS vessel tracking system, while one-third comprised vessels without AIS.
5.  This preliminary study demonstrates how concomitant long-term continuous broadband on-animal sound and movement recordings may be an important tool in future quantification of disturbance effects of anthropogenic activities at sea and assessment of long-term population impacts on pinnipeds.
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Details

Original languageEnglish
Number of pages14
JournalEcology and Evolution
VolumeEarly View
Early online date6 Feb 2019
DOIs
Publication statusE-pub ahead of print - 6 Feb 2019

    Research areas

  • Anthropogenic noise, Behavioral response, Biologging, DTAG, Exposure rates, Gray seal, Harbor seal, Long-duration acoustic dataloggers

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