Prey capture attempts can be detected in Steller sea lions and other marine predators using accelerometers |
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Authors: | Morgane Viviant Andrew W Trites David A S Rosen Pascal Monestiez Christophe Guinet |
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Institution: | 1. Centre d’Etudes Biologiques de Chizé, CNRS, 79 360, Villiers en Bois, France 2. Marine Mammal Research Unit, Fisheries Centre, University of British Columbia, 2202 Main Mall, Vancouver, BC, V6T 1Z4, Canada 3. Institut National de la Recherche Agronomique, Unité de Biostatistique et Processus Spatiaux, Site Agroparc Domaine St Paul, 84914, Avignon, France
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Abstract: | We attached accelerometers to the head and jaw of a Steller sea lion (Eumetopias jubatus) to determine whether feeding attempts in a controlled setting could be quantified by acceleration features characteristic
of head and jaw movements. Most of the 19 experimental feeding events that occurred during the 51 dives recorded resulted
in specific acceleration patterns that were clearly distinguishable from swimming accelerations. The differential acceleration
between the head-mounted and jaw-mounted accelerometers detected 84% of prey captures on the vertical axis and 89% on the
horizontal axis. However, the jaw-mounted accelerometer alone proved to be equally effective at detecting prey capture attempts.
Acceleration along the horizontal (surge)-axis appeared to be particularly efficient in detecting prey captures, and suggests
that a single accelerometer placed under the jaw of a pinniped is a promising and easily implemented means of recording prey
capture attempts. |
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