Community composition of bacteria isolated from Swiss banknotes varies depending on collection environment

Humans interact constantly with surfaces and associated microbial communities in the environment. The factors shaping the composition of these communities are poorly understood: some proposed explanations emphasize the influence of local habitat conditions (niche-based explanations), while others point to geographic structure and the distance among sampled locations (dispersal-based explanations). However, the relative roles of these different drivers for microbial community assembly on human-associated surfaces are not clear. Here, we used a combination of sampling, sequencing (16S rRNA) and culturing to show that the composition of banknote-associated bacterial communities varies depending on the local collection environment. Using banknotes collected from various locations and types of shops across Switzerland, we found taxonomic diversity dominated by families such as Pseudomonadaceae and Staphylococcaceae, but with banknote samples from particular types of shops (especially butcher...人类始终与环境中的各类表面及其附着的微生物群落发生交互。目前学界对塑造此类群落组成的影响因素尚缺乏充分认知：部分假说强调本地生境条件的作用（基于生态位的解释），另有假说则关注地理结构与采样位点间的空间距离（基于扩散的解释）。然而，上述两类不同驱动因子在人类接触表面的微生物群落构建过程中的相对贡献仍不明确。本研究通过采样、16S核糖体RNA（16S rRNA）测序与微生物培养结合的实验手段，证实纸币附着的细菌群落组成会因样本采集的本地环境而异。研究团队采集了瑞士境内不同地区、不同类型商铺的纸币样本，发现其分类学多样性以假单胞菌科（Pseudomonadaceae）、葡萄球菌科（Staphylococcaceae）等菌科为主，但来自特定类型商铺（尤其是肉铺……