VARYING COEFFICIENTS CORRELATED VELOCITY MODELS IN COMPLEX LANDSCAPES WITH BOUNDARIES APPLIED TO NARWHAL RESPONSES TO NOISE EXPOSURE - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2024

VARYING COEFFICIENTS CORRELATED VELOCITY MODELS IN COMPLEX LANDSCAPES WITH BOUNDARIES APPLIED TO NARWHAL RESPONSES TO NOISE EXPOSURE

Alexandre Delporte
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Adeline Samson
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Résumé

Narwhals in the Arctic are increasingly exposed to human activities that can temporarily or permanently threaten their survival by modifying their behavior. We examine GPS data from a population of narwhals exposed to ship and seismic airgun noise during a controlled experiment in 2018 in the Scoresby Sound fjord system in Southeast Greenland. The fjord system has a complex shore line, restricting the behavioral response options for the narwhals to escape the threats. We propose a new continuous-time correlated velocity model with varying coefficients that includes spatial constraints on movement. To assess the sound exposure effect we compare a baseline model for the movement before exposure to a response model for the movement during exposure. Our model, applied to the narwhal data, suggests increased tortuosity of the trajectories as a consequence of the spatial constraints, and further indicates that sound exposure can disturb narwhal motion up to a couple of tens of kilometers. Specifically, we found an increase in velocity and a decrease in the movement persistence.

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Dates et versions

hal-04684712 , version 1 (03-09-2024)
hal-04684712 , version 2 (16-09-2024)

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Alexandre Delporte, Susanne Ditlevsen, Adeline Samson. VARYING COEFFICIENTS CORRELATED VELOCITY MODELS IN COMPLEX LANDSCAPES WITH BOUNDARIES APPLIED TO NARWHAL RESPONSES TO NOISE EXPOSURE. 2024. ⟨hal-04684712v1⟩
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