Global phylogenetic community structure and β-diversity patterns in surface bacterioplankton metacommunities
Global phylogenetic community structure and β-diversity patterns in surface bacterioplankton metacommunities
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DOI：
10.3354/ame01389
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发表时间：
2010-01-01
影响因子：
1.4
通讯作者：
Casamayor, Emilio O.
中科院分区：
文献类型：
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作者：
Barberan, Albert;Casamayor, Emilio O.
我们的目标是从全球范围的表层水域(湖泊和海洋-34个地点和大约4500个16S rRNA基因序列)中识别丰富的浮游细菌(阿尔法、β和伽马蛋白细菌、放线细菌、蓝藻和拟杆菌)的系统发育群落模式。在每个地点，我们通过群落系统发育荟萃分析方法评估观察到的细菌群的数量和最丰富的群的遗传关联度，以(1)探索哪些潜在的生态过程与群落聚集中观察到的系统发育模式相一致，以及(2)在不同细菌群的β多样性模式中理清空间和环境的影响。与海洋水域相比，内陆水域的细菌群明显更多，也更多样化。海洋栖息地显示出比湖泊更高的聚集性，细菌群落的关系比预期的更密切。系统发育β多样性分析揭示了优势细菌的盐分组成(海洋盐湖与内陆盐湖)和盐浓度的不同模式。我们观察到，类杆菌的β多样性模式主要由盐度浓度决定，而阿尔法蛋白细菌和伽马蛋白细菌的模式则受盐组成的控制。放线杆菌、β蛋白细菌和鞘氨醇细菌在海洋栖息地和盐碱地大部分缺失。总体而言，尽管缺乏上下文元数据，但环境相似性比空间分布对细菌β-多样性模式更具相关性。然而，我们检测到一些内陆水域的类群(即放线杆菌、β-杆菌和伽马蛋白细菌)的地理信号。总体而言，这些分析表明，不同的系统发育群体和反映的模式之间的差异，可以作为进一步探索社区集合理论的基础。
We aimed to identify phylogenetic community patterns in abundant planktonic bacteria (Alpha-, Beta-, and Gammaproteobacteria, Actinobacteria, Cyanobacteria, and Bacteroidetes) from a worldwide range of surface waters (lakes and seas-34 sites and ca. 4500 16S rRNA gene sequences). At each site we assessed the number of observed bacterial groups and the genetic relatedness of the most abundant groups through a community phylogenetic meta-analysis approach in order to (1) explore which potential ecological processes were consistent with the observed phylogenetic patterns in community assembly and (2) disentangle the effects of space and environment in beta-diversity patterns for the different bacterial groups. Inland waters had significantly more bacterial groups and were more diverse than marine waters. Marine habitats showed a higher percentage of clustered sites than lakes, and bacterial communities were more closely related than expected by chance. Phylogenetic beta-diversity analyses revealed different patterns to both salt composition (marine vs. inland salt lakes) and salt concentration for the dominant bacteria. We observed that while beta-diversity patterns for Bacteroidetes were mostly shaped by salinity concentration, patterns in Alphaproteobacteria and Gammaproteobacteria were controlled by salt composition. Actinobacteria, Betaproteobacteria and Sphingobacteria were largely absent from marine habitats and from saline continental sites. In general and despite the lack of contextual metadata, environmental similarity was more relevant than spatial distribution for bacterial beta-diversity patterns. However, we detected a geographic signal for some inland waters' groups (i.e. Actinobacteria, Beta-, and Gammaproteobacteria). Overall, the analyses indicated differences among phylogenetic groups and reflected patterns upon which further exploration of community assembly theory could be based.