Postprint version. Published in Contribution to Microbiology, Volume 16, January 1, 2009, pages 182-193.
The definitive version is available at http://dx.doi.org/10.1159/000219380.
Magnetotactic bacteria orient and migrate along geomagnetic field lines. Magneto-aerotaxis increases the efficiency of respiring microaerophilic cells to efficiently find and maintain a position at a preferred microaerobic oxygen concentration. Magneto-aerotaxis could also facilitate access to regions of higher nutrient and electron acceptor concentration via periodic excursions above and below the preferred oxygen concentration level.