Tracking the kinematics of caudal-oscillatory swimming: a comparison of two on-animal sensing methods
Abstract
Studies of locomotion kinematics require high-resolution information about body movements and the specific acceleration (SA) that these generate. On-animal accelerometers measure both orientation and SA but an additional orientation sensor is needed to accurately separate these. Although gyroscopes can perform this function, their power consumption, drift and complex data processing make them unattractive for biologging. Lower power magnetometers can also be used with some limitations. Here, we present an integrated and simplified method for estimating body rotations and SA applicable to both gyroscopes and magnetometers, enabling a direct comparison of these two sensors. We use a tag with both sensors to demonstrate how caudal-oscillation rate and SA are adjusted by a diving whale in response to rapidly changing buoyancy forces as the lungs compress while descending. Both sensors gave similar estimates of the dynamic forces demonstrating that magnetometers may offer a simpler low-power alternative for miniature tags in some applications.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 01, 2016
- Source ID
- 10.1242/jeb.136242
Entities
People
- Lucía Martina Martín López
- Mark A. Johnson
- Natacha Aguilar de Soto
- Patrick Miller
Organizations
- Aarhus University
- Marine Alliance for Science and Technology for Scotland
- Office of Naval Research
- University of La Laguna
- University of St Andrews