Lee Sang-Hoon, Kim Taek-Seung, Park Hee-Deung
School of Civil, Environmental and Architectural Engineering, Korea University.
Microbes Environ. 2021;36(1). doi: 10.1264/jsme2.ME20110.
Despite the importance of microbial communities in ecosystem functions, the mechanisms underlying the assembly of rare taxa over time are poorly understood. It remains largely unknown whether rare taxa exhibit similar assembly processes to common taxa in local communities. We herein retrieved the 16S rRNA sequences of bacteria collected bimonthly for 2 years from the Pohang wastewater treatment plant. The transient-rare taxa showed different abundance distributions from the common taxa. Transient-rare taxon assemblages also exhibited higher temporal variations than common taxon assemblages, suggesting the distinct ecological patterns of the two assemblages. A multivariate analysis revealed that environmental parameters accounted for 25.3 and 61.6% of temporal variations in the transient-rare and common taxon assemblages, respectively. The fitting of all observed taxa to a neutral community model revealed that 96.4% of the transient-rare taxa (relative abundance, 71.4%) and 73.3% of the common taxa (relative abundance, 45.6%) followed the model, suggesting that stochastic mechanisms were more important than deterministic ones in the assembly of the transient-rare taxa. Collectively, the present results indicate that the transient-rare bacterial taxa at the Pohang wastewater treatment plant differed from the common taxa in ecological patterns, suggesting that dispersal is a key process in their assembly.
尽管微生物群落对生态系统功能很重要，但稀有类群随时间组装的潜在机制仍知之甚少。在当地群落中，稀有类群是否与常见类群表现出相似的组装过程在很大程度上仍不清楚。我们在此检索了从浦项废水处理厂每两个月收集一次、为期2年的细菌16S rRNA序列。短暂稀有类群与常见类群呈现出不同的丰度分布。短暂稀有类群组合也比常见类群组合表现出更高的时间变化，这表明这两种组合具有不同的生态模式。多变量分析显示，环境参数分别解释了短暂稀有类群组合和常见类群组合时间变化的25.3%和61.6%。将所有观察到的类群拟合到一个中性群落模型，结果显示96.4%的短暂稀有类群（相对丰度为71.4%）和73.3%的常见类群（相对丰度为45.6%）符合该模型，这表明在短暂稀有类群的组装过程中，随机机制比确定性机制更重要。总体而言，目前的结果表明，浦项废水处理厂的短暂稀有细菌类群在生态模式上与常见类群不同，这表明扩散是它们组装过程中的一个关键过程。
