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Tracking marine mammals in 3D using electronic tag data

Laplanche, Christophe and Marques, Tiago and Thomas, Len Tracking marine mammals in 3D using electronic tag data. (2015) Methods in Ecology and Evolution, 6 (9). 987-996. ISSN 2041-210X

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Official URL: http://dx.doi.org/10.1111/2041-210X.12373

Abstract

Information about at-depth behaviour of marine mammals is fundamental yet very hard to obtain from direct visual observation. Animal-borne multisensor electronic tags provide a unique window of observation into such behaviours. Electronic tag sensors allow the estimation of the animal's 3-dimensional (3D) orientation, depth and speed. Using tag flow noise level to provide an estimate of animal speed, we extend existing approaches of 3D track reconstruction by allowing the direction of movement to differ from that of the animal's longitudinal axis. Data are processed by a hierarchical Bayesian model that allows processing of multisource data, accounting for measurement errors and testing hypotheses about animal movement by comparing models. We illustrate the approach by reconstructing the 3D track of a 52-min deep dive of a Blainville's beaked whale Mesoplodon densirostris adult male fit with a digital tag (DTAG) in the Bahamas. At depth, the whale alternated regular movements at large speed (>1·5 m s -1) and more complex movements at lower speed (<1·5m s-1) with differences between movement and longitudinal axis directions of up to 28inline image. The reconstructed 3D track agrees closely with independent acoustic-based localizations. The approach is potentially applicable to study the underwater behaviour (e.g. response to anthropogenic disturbances) of a wide variety of species of marine mammals fitted with triaxial magnetometer and accelerometer tags.

Item Type:Article
HAL Id:hal-01227976
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > University of St Andrews (UNITED KINGDOM)
Laboratory name:
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Deposited By: christophe laplanche
Deposited On:12 Nov 2015 13:08

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