Swarming bacteria migrate by Lévy Walk.
Swarming bacteria migrate by Lévy Walk.
复制标题
DOI：
10.1038/ncomms9396
复制
发表时间：
2015-09-25
影响因子：
16.6
通讯作者：
Be'er A
中科院分区：
文献类型：
--
作者：
Ariel G;Rabani A;Benisty S;Partridge JD;Harshey RM;Be'er A
Individual swimming bacteria are known to bias their random trajectories in search of food and to optimize survival. The motion of bacteria within a swarm, wherein they migrate as a collective group over a solid surface, is fundamentally different as typical bacterial swarms show large-scale swirling and streaming motions involving millions to billions of cells. Here by tracking trajectories of fluorescently labelled individuals within such dense swarms, we find that the bacteria are performing super-diffusion, consistent with Lévy walks. Lévy walks are characterized by trajectories that have straight stretches for extended lengths whose variance is infinite. The evidence of super-diffusion consistent with Lévy walks in bacteria suggests that this strategy may have evolved considerably earlier than previously thought. Lévy walks have been found in the motion of large animals such as birds and fish in search of sparsely and randomly distributed food. Here, Ariel et al. observe, by tracking long-duration trajectories of fluorescently labelled bacteria, similar walks in bacterial swarms for the first time.
