Change in Geomagnetic Field Intensity Alters Migration-Associated Traits in a Migratory Insect

Abstract

Overview

The role of geomagnetic field (GMF) intensity in influencing migratory behaviors and other associated phenotypes in animals remains an underexplored area of study. This research focuses on the impact of varying GMF intensities along the migration routes of the nocturnal insect migrant, the brown planthopper Nilaparvata lugens.

Methodology

The study simulated GMF intensity variations within a narrow range that are typically experienced across different geographical locations.

Findings

• Observation of significant differences in morphological, behavioral, and physiological traits related to migration after exposure to a 5 µT difference in GMF intensity.
• Key traits impacted include wing dimorphism, flight capacity, and positive phototaxis.
• Consistent effects were also seen in the expression of the phototaxis-related gene Cry1 and in levels of triglyceride and trehalose, crucial energy substrates for flight.

Conclusion

This study highlights the critical role of GMF intensity in altering migration-associated traits and demonstrates the potential adaptive benefits of magnetoreception in migratory insects navigating through varying environmental conditions.