Factors shaping community patterns of microorganisms are controversially discussed. Physical and chemical factors certainly limit the survival of individual taxa and maintenance of diversity. In recent years, a contribution of geographic distance and dispersal barriers to distribution patterns of protists and bacteria has been demonstrated. Organismic interactions such as competition, predation and mutualism further modify community structure and maintenance of distinct taxa. Here, we address the relative importance of these different factors in shaping protists and bacterial communities on a European scale using high‐throughput sequencing data obtained from lentic freshwater ecosystems. We show that community patterns of protists are similar to those of bacteria. Our results indicate that cross‐domain organismic factors are important variables with a higher influence on protists as compared with bacteria. Abiotic physical and chemical factors also contributed significantly to community patterns. The contribution of these latter factors was higher for bacteria, which may reflect a stronger biogeochemical coupling. The contribution of geographical distance was similar for both microbial groups.

中文翻译：

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在欧洲范围内塑造原生生物和细菌群落模式的因素。

有争议地讨论了影响微生物群落模式的因素。物理和化学因素肯定会限制单个分类单元的生存和多样性的维持。近年来，已经证明了地理距离和分散障碍对原生生物和细菌的分布模式的贡献。竞争，掠夺和互惠等生物互动进一步改变了社区结构并维持了不同的分类单元。在这里，我们使用从透镜状淡水生态系统获得的高通量测序数据来研究这些不同因素在欧洲规模形成原生生物和细菌群落中的相对重要性。我们表明，原生生物的群落模式与细菌相似。我们的结果表明，与细菌相比，跨域生物因子是重要的变量，对原生生物的影响更大。非生物的物理和化学因素也极大地促进了社区格局。后面这些因素对细菌的贡献更大，这可能反映了更强的生物地球化学耦合。两种微生物的地理距离贡献相似。