Fig. 2

Example of the movement of a single conch over 20 min with data from the animal-attached tag being recorded at 20 Hz. Nineteen distinct movements are identifiable. Displayed are the three acceleration axes (x, y, z) and components of the VeDBA metric, the three rotational axes components of the RocRM metric (pitch, roll and heading angles), the vectoral sum of the dynamic acceleration (VeDBA) commonly used as a proxy of energy expenditure and the vectoral sum of the rotational axes (RocRM) over a 10 s step length. Pitch, roll, heading and VeDBA were subject to a smoothing window of 5 s