Bacterial Route Finding and Collective Escape in Mazes and Fractals
Abstract
Bacteria which grow not on the featureless agar plates of the microbiology lab but in the real world mustnavigate topologies which are nontrivially complex, such as mazes or fractals. We show that chemo-sensitive motileE. colican efficiently explore nontrivial mazes in times much shorter than a no-memory(Markovian) walk would predict, and can collectively escape from a fractal topology. The strategies usedby the bacteria include individual power-law probability distribution function exploration, the launching ofchemotactic collective waves with preferential branching at maze nodes and defeating of fractal pumping,and bet hedging in case the more risky attempts to find food fail.
