Magnetotaxis is when a bacteria senses magnetic fields and changes its movement. 

University of Wisconsin - Madison

There are many environmental signals bacteria sense that influence their movement in the form of a taxis. These taxes are: 
- Phototaxis
- Magnetotaxis
- Chemotaxis

Taxis Influencing Bacterial Movement 

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

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OpenStax Microbiology Textbook

Magnetotaxis

Chemotaxis refers to a bacteria changing its direction of movement based on a chemical compound.

Chemotaxis

Phototaxis is the directional movement of a bacterium in response to light stimulation.

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