Spatiotemporal dynamics of the archaeal community in coastal sediments: assembly process and co-occurrence relationship
Spatiotemporal dynamics of the archaeal community in coastal sediments: assembly process and co-occurrence relationship
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沿海沉积物中古菌群落的时空动态：组装过程和共生关系
DOI：
10.1038/s41396-020-0621-7
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发表时间：
2020-03-04
期刊：
影响因子：
11
通讯作者：
Zhang, Xiao-Hua
中科院分区：
文献类型：
--
作者：
Liu, Jiwen;Zhu, Shangqing;Zhang, Xiao-Hua
海洋底栖古菌群落的研究正在更新我们对其分类组成和代谢多样性的看法。然而，在社区集会进程和分类群间协会方面仍然存在巨大的知识差距。本文采用16S rRNA基因扩增测序和qPCR技术，对中国东部1500 km边缘海58个表层沉积物样品中古菌群落的时空动态、组装过程和共生关系进行了研究。在古菌群落结构的时空动态中观察到明确的模式，具有更明显的空间变化，而不是季节性变化。伴随着地理变化的是一个显着的距离衰减模式不同的贡献，从不同的古菌分支，由它们的相对丰度。在这两个季节中，扩散限制是最重要的过程，解释了约40%的群落变化，其次是同质选择和生态漂移，作出了大约相等的贡献（约30%）。这意味着随机性而不是决定论对古菌群落集会有更大的影响。此外，我们观察到古菌共生模式的季节性：在冬季比在夏季更密切的类群间的联系，和不匹配的地理模式之间的社区组成和共生关系。这些结果表明，中国东部边缘海沉积物中的底栖古菌群落具有明显的季节性特征，但其共生关系随季节变化而变化，显示了中国东部边缘海沉积物中古菌群落复杂的动态模式。
Studies of marine benthic archaeal communities are updating our view of their taxonomic composition and metabolic versatility. However, large knowledge gaps remain with regard to community assembly processes and inter taxa associations. Here, using 16S rRNA gene amplicon sequencing and qPCR, we investigated the spatiotemporal dynamics, assembly processes, and co-occurrence relationships of the archaeal community in 58 surface sediment samples collected in both summer and winter from across ∼1500 km of the eastern Chinese marginal seas. Clear patterns in spatiotemporal dynamics in the archaeal community structure were observed, with a more pronounced spatial rather than seasonal variation. Accompanying the geographic variation was a significant distance-decay pattern with varying contributions from different archaeal clades, determined by their relative abundance. In both seasons, dispersal limitation was the most important process, explaining ∼40% of the community variation, followed by homogeneous selection and ecological drift, that made an approximately equal contribution (∼30%). This meant that stochasticity rather than determinism had a greater impact on the archaeal community assembly. Furthermore, we observed seasonality in archaeal co-occurrence patterns: closer inter-taxa connections in winter than in summer, and unmatched geographic patterns between community composition and co-occurrence relationship. These results demonstrate that the benthic archaeal community was assembled under a seasonal-consistent mechanism but the co-occurrence relationships changed over the seasons, indicating complex archaeal dynamic patterns in coastal sediments of the eastern Chinese marginal seas.