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首页> 外文期刊>Frontiers in Microbiology >Distinct Assembly Mechanisms Underlie Similar Biogeographic Patterns of Rare and Abundant Bacterioplankton in Cascade Reservoirs of a Large River
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Distinct Assembly Mechanisms Underlie Similar Biogeographic Patterns of Rare and Abundant Bacterioplankton in Cascade Reservoirs of a Large River

机译：不同的装配机制利于一条大河级联储层稀有和丰富的菌株的类似生物地理图案

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Bacterioplankton communities commonly consist of few highly abundant species and a large number of rare species that play key roles in biogeochemical cycles of aquatic ecosystems. However, little is known about the biogeographic assemblies of these communities, especially in large rivers suffering from cascade dam regulation. Here, we used a 16S rRNA gene amplicon sequencing approach to investigate the biogeographic patterns and underlying assembly mechanisms of abundant and rare bacterioplankton taxa in cascade reservoirs of the Jinsha River in China. The results revealed species loss of bacterioplankton due to dam construction, which was more significant for rare taxa than for abundant ones. The distributions of abundant and rare taxa exhibited similar spatial and temporal patterns, which were significantly distinct between winter and summer and between upstream and downstream reservoirs. Both spatial (dispersal-related process) and environmental (selection process) factors seemed to together govern the assembly and biogeography of abundant and rare taxa, although both factors explained only a small fraction of variation in the rare taxa. More importantly, environmental factors explained more community variation in abundant sub-community than that in rare sub-community. Co-occurrence network analysis revealed that abundant species with closer interactions were more often located in a central position of the network compared with rare species. Nevertheless, half of the keystone species were rare species and may play important roles in maintaining the network stability. Overall, these findings indicate that distinct assembly mechanisms underlie the similar biogeography of rare and abundant bacteria in cascade reservoirs of a large river.
机译：菌株植物群落通常包括少数高度丰富的物种和大量罕见的物种，在水生生态系统的生物地质化学循环中发挥关键作用。然而，关于这些社区的生物地图组件知之甚少，特别是在患有级联坝调节的大型河流中。在这里，我们使用了16S rRNA基因扩增函数测序方法来研究中国金沙河级联水库中丰富和稀有含有稀有含有稀有菌株的产物和潜在的装配机制。结果揭示了由于大坝施工而导致的菌株物种损失，这对于罕见的分类群而言比丰富的含量更为显着。丰富和罕见的分类征的分布表现出类似的空间和时间模式，在冬季和夏季以及上游和下游水库之间显着截然不同。空间（分散相关过程）和环境（选择过程）因素似乎在一起管理丰富和稀有分类群的组装和生物地，尽管这两个因素都仅解释了罕见的分类群中的一小部分变异。更重要的是，环境因素解释了丰富的子群体中的更多社区变异，而不是罕见的亚社区。共发生网络分析显示，与罕见物种相比，具有更紧密相互作用的丰富物种更常见于网络的中心位置。然而，梯形岩物种的一半是罕见的物种，可能在维持网络稳定方面发挥重要作用。总体而言，这些发现表明，不同的装配机制基于一条大河级联水库稀有和丰富的细菌的类似生物地理。

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