Upper bound for broadband radiofrequency field disruption of magnetic compass orientation in night-migratory songbirds

Abstract

Overview

Night-migratory songbirds utilize a light-dependent magnetic compass for orientation, primarily influenced by a radical pair mechanism in cryptochrome proteins within the retina.

Findings

• The study investigates the effect of radiofrequency (RF) electromagnetic fields on the orientation capabilities of Eurasian blackcaps.
• It was observed that frequencies between 140 to 150 MHz and 235 to 245 MHz do not affect their magnetic orientation.
• The research suggests that RF field effects on radical-pair-based sensors are approximately frequency-independent up to 116 MHz.
• Sensitivity to RF disorientation significantly decreases beyond this frequency.

Conclusion

This research provides evidence supporting the radical pair mechanism in bird magnetic orientation, with significant implications for understanding avian navigation.