Emergent Run-and-Tumble Behavior in a Simple Model of Chlamydomonas with Intrinsic Noise
arXiv:1211.3272 · doi:10.1103/PhysRevLett.110.148102
Abstract
Recent experiments on the green alga Chlamydomonas that swims using synchronized beating of a pair of flagella have revealed that it exhibits a run-and-tumble behavior similar to that of bacteria such as E. Coli. Using a simple purely hydrodynamic model that incorporates a stroke cycle and an intrinsic Gaussian white noise, we show that a stochastic run-and-tumble behavior could emerge, due to the nonlinearity of the combined synchronization-rotation-translation dynamics. This suggests the intriguing possibility that the alga might exploit nonlinear mechanics---as opposed to sophisticated biochemical circuitry as used by bacteria---to control its behavior.
5 pages, 2 composite figures (made of 12 separate EPS files)
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