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首页> 外文期刊>Applied and Environmental Microbiology >Free-Living and Particle-Associated Bacterioplankton in Large Rivers of the Mississippi River Basin Demonstrate Biogeographic Patterns
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Free-Living and Particle-Associated Bacterioplankton in Large Rivers of the Mississippi River Basin Demonstrate Biogeographic Patterns

机译：密西西比河流域大河中的自由活动和颗粒相关的浮游细菌展示了生物地理格局

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The different drainage basins of large rivers such as the Mississippi River represent interesting systems in which to study patterns in freshwater microbial biogeography. Spatial variability in bacterioplankton communities in six major rivers (the Upper Mississippi, Missouri, Illinois, Ohio, Tennessee, and Arkansas) of the Mississippi River Basin was characterized using Ion Torrent 16S rRNA amplicon sequencing. When all systems were combined, particle-associated (>3 μm) bacterial assemblages were found to be different from free-living bacterioplankton in terms of overall community structure, partly because of differences in the proportional abundance of sequences affiliated with major bacterial lineages (Alphaproteobacteria, Cyanobacteria, and Planctomycetes). Both particle-associated and free-living communities ordinated by river system, a pattern that was apparent even after rare sequences or those affiliated with Cyanobacteria were removed from the analyses. Ordination of samples by river system correlated with environmental characteristics of each river, such as nutrient status and turbidity. Communities in the Upper Mississippi and the Missouri and in the Ohio and the Tennessee, pairs of rivers that join each other, contained similar taxa in terms of presence-absence data but differed in the proportional abundance of major lineages. The most common sequence types detected in particle-associated communities were picocyanobacteria in the Synechococcus/Prochlorococcus/Cyanobium (Syn/Pro) clade, while free-living communities also contained a high proportion of LD12 (SAR11/Pelagibacter)-like Alphaproteobacteria. This research shows that while different tributaries of large river systems such as the Mississippi River harbor distinct bacterioplankton communities, there is also microhabitat variation such as that between free-living and particle-associated assemblages.
机译：诸如密西西比河之类的大河流的不同流域代表了研究淡水微生物生物地理学格局的有趣系统。使用离子激流16S rRNA扩增子序列对密西西比河流域的六个主要河流（密西西比河上游，密苏里州，伊利诺伊州，俄亥俄州，田纳西州和阿肯色州）的浮游细菌群落的空间变异性进行了表征。当将所有系统组合在一起时，就整体群落结构而言，发现与颗粒相关（> 3μm）的细菌组合与自由生活的浮游生物不同，部分原因是与主要细菌谱系（Alproproteobacteria）相关的序列的比例丰度不同，蓝细菌和菌种）。无论是与粒子相关的社区还是与自由生活相关的社区，都受到河流系统的支配，即使从稀有序列或蓝藻属的相关序列中删除了这种模式，这种模式也很明显。河流系统对样品的排序与每条河流的环境特征（例如营养状况和浊度）相关。密西西比河上游和密苏里州以及俄亥俄州和田纳西州的社区相互连接，成对的河流在缺勤数据方面包含相似的分类单元，但主要谱系的比例丰度有所不同。在颗粒相关群落中检测到的最常见序列类型是Synechococcus / Prochlorococcus / Cyanobium（Syn / Pro）进化枝中的微蓝细菌，而自由生活的群落也包含高比例的LD12（SAR11 / Pelagibacter）样的阿尔法蛋白细菌。这项研究表明，虽然大型河流系统的不同支流（例如密西西比河）具有独特的浮游植物群落，但也存在微生境变异，例如自由生活和与粒子相关的组合之间的变异。

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