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Long-distance transequatorial navigation using sequential measurements of magnetic inclination angle
Brian K Taylor1, Kenneth J Lohmann1, Luke T Havens1
1Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
Journal of the Royal Society, Interface
|January 6, 2021
Summary
Sequential magnetic inclination measurements enable transequatorial animal migration and support navigation in reversed magnetic fields. This finding has implications for bio-inspired autonomous systems navigating Earth’s changing magnetic field.
Area of Science:
- Animal navigation
- Bio-inspired engineering
- Geophysics
Background:
- Diverse taxa navigate using Earth's magnetic field for migration.
- Animals utilize magnetic inclination as a compass and latitude surrogate.
- The role of magnetic inclination in long-distance migration remains unclear.
Purpose of the Study:
- Investigate if sequential magnetic inclination measurements can guide transequatorial migrations.
- Assess navigation strategies in present-day and reversed magnetic fields using an agent-based model.
Main Methods:
- Agent-based modeling simulating migration.
- Testing navigation strategies with sequential inclination data.
- Simulations in both current and reversed geomagnetic fields.
Main Results:
- Sequential inclination measurements successfully enabled transequatorial migrations.
- Inclination-based navigation strategies proved robust in reversed magnetic fields.
- Findings align with some animal navigation experiment results.
Conclusions:
- Sequential magnetic inclination data can facilitate migration between hemispheres.
- Inclination-based navigation is resilient to magnetic field reversals.
- This strategy could inform the design of robust autonomous navigation systems.
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