Avian magnetoreception model realized by coupling magnetite-based mechanism with radical-pair-based mechanism

TL;DR

This paper proposes a biophysical model combining magnetite-based and radical-pair mechanisms to explain how birds sense Earth's magnetic field for navigation, aligning with experimental observations.

Contribution

It introduces a novel integrated model that links magnetic particle properties with radical-pair reactions to elucidate avian magnetoreception.

Findings

Ferromagnetic particles induce more significant singlet product changes.

The model explains the 180° variation in singlet products with geomagnetic inclination.

Results support the inclination compass mechanism in birds.

Abstract

Many animal species were verified to use geomagnetic field for their navigation, but the biophysical mechanism of magnetoreception has remained enigmatic. This paper presents a special biophysical model that consists of magnetite-based and radical-pair-based mechanisms for avian magnetoreception. The amplitude of the resultant magnetic field around the magnetic particles corresponds to the geomagnetic field direction and affects the yield of singlet/triplet state products in the radical-pair reactions. Therefore, in the proposed model, the singlet/triplet state product yields are related to the geomagnetic field information for orientational detection. The resultant magnetic fields corresponding to two materials with different magnetic properties were analyzed under different geomagnetic field directions. The results showed that ferromagnetic particles in organisms can provide more significant changes in singlet state products than superparamagnetic particles, and the period of variation for the singlet state products with an included angle in the geomagnetic field is approximately 180{\deg} when the magnetic particles are ferromagnetic materials, consistent with the experimental results obtained from avian magnetic compass. Further, the calculated results of the singlet state products in a reception plane showed that the proposed model can explain the avian magnetoreception mechanism with an inclination compass.