Abstract

Overview

Magnetotactic bacteria (MTB) utilize magnetotaxis to navigate to their optimal habitats. However, the impact of different magnetic fields on their sediment stability has not been well explored.

Methodology

This study investigates two wild types of MTB, cocci and rod-shaped M. bavaricum, in various magnetic settings: a consistent geomagnetic field, a null field, and an alternating field with daily polarity changes. The research was conducted in a controlled laboratory environment.

Findings

• In the absence of a magnetic field for six months, the M. bavaricum population declined by approximately 50%, without indicating certain extinction.
• Upon re-exposure to the geomagnetic field, cell populations returned to initial levels within approximately 1.5 months.
• Cocci showed significant temporal fluctuations but remained stable in a zero field condition.
• The alternating magnetic field resulted in a modest reduction in M. bavaricum numbers and a near extinction of cocci, illustrating the significance of magnetotaxis in sediment.

Conclusion

This research provides initial quantitative insights into the magnetotactic advantages in sedimentary environments and suggests potential survival mechanisms for bacteria during geomagnetic reversals observed in geological periods.