论文标题
混合物种蜂群的物理特征
Physical characteristics of mixed-species swarming colonies
论文作者
论文摘要
在本质上，细菌集体通常由多种物种组成，这些物种在生化和物理上既相互作用。尽管如此，过去对蜂群物理特性的研究集中在轴突（单个物种）种群上。在细菌群中，个体之间的复杂相互作用会导致簇，快速喷射和涡旋，这些旋转依赖于速度和长度等细胞特征。在这项工作中，我们展示了{\ sl bacillus uttilis}和{\ sl serratia marcescens}迅速群的混合物种种群的第一个结果，这是两个模型的群体，它们在轴突情况下已知良好。在混合液体培养物中，这两种物种的繁殖率较高。我们表明，混合的种群群群良好，并且物种之间的分数决定了所有动态尺度 - 从显微镜（例如速度分布），介质（涡旋尺寸）和宏观（群体大小结构）。了解混合物种群对于对细菌蜂群现象及其生物学和进化意义的全面理解至关重要。
In nature, bacterial collectives typically consist of multiple species, which are interacting both biochemically and physically. Nonetheless, past studies on the physical properties of swarming bacteria were focused on axenic (single species) populations. In bacterial swarming, intricate interactions between the individuals lead to clusters, rapid jets and vortices that depend on cell characteristics such as speed and length. In this work, we show the first results of rapidly swarming mixed-species populations of {\sl Bacillus subtilis} and {\sl Serratia marcescens}, two model swarm species that are known to swarm well in axenic situations. In mixed liquid cultures, both species have higher reproduction rates. We show that the mixed population swarms together well and that the fraction between the species determines all dynamical scales - from the microscopic (e.g. speed distribution), mesoscopic (vortex size) and macroscopic (colony size structure). Understanding mixed-species swarms is essential for a comprehensive understanding of the bacterial swarming phenomenon and its biological and evolutionary implications.
