Electronic Supplementary Material and Supplemental Figures

The built environment—the homes, workplaces, vehicles, and other spaces where people spend most of their time—contains an enormous diversity of microorganisms with significance for human wellbeing, yet we know little about the factors shaping these microbial communities. We found that patterns of wetting and drying that mimic indoor leaks on common building materials affects the diversity of bacteria and fungi growing on the materials. But the identity of these microorganisms differed from one building material to another, and this was especially variable with wetting and drying. This means that common disturbances that lead to microbial growth in homes and offices can make it difficult to predict which microbes, including those that represent health threats to people, will occur in the built environment.

建成环境（built environment）——即人类每日多数时间逗留的住宅、工作场所、交通工具及其他各类空间——蕴含着与人类健康福祉息息相关的海量微生物多样性，但目前学界对塑造这类微生物群落的影响因素仍知之甚少。本研究发现，模拟常见建筑材料表面室内渗漏情境的干湿循环模式，会影响材料表面滋生的细菌与真菌多样性。但这类微生物的物种组成会因建筑材料类型不同而存在差异，且该差异会随干湿循环模式发生显著波动。这意味着，导致住宅与办公场所内微生物滋生的常见扰动因素，会使得我们难以预测建成环境中会出现哪些微生物——其中也包括可能对人类健康构成威胁的菌株。