Integrating Stochastic and Deterministic Process in the Biogeography of N2-Fixing Cyanobacterium Candidatus Atelocyanobacterium Thalassa

文献类型： 外文期刊

第一作者： Li, Liuyang

作者： Li, Liuyang;Huang, Danyue;Sun, Jun;Li, Liuyang;Wu, Chao;Ding, Changling;Huang, Danyue;Ding, Changling;Wei, Yuqiu

作者机构：

关键词： cyanobacteria; nifH; UCYN-A; community assembly; stochasticity; determinism; temperature

期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：5.2； 五年影响因子：6.2 ）

ISSN：

年卷期： 2021 年 12 卷

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收录情况： SCI

摘要： UCYN-A is one of the most widespread and important marine diazotrophs. Its unusual distribution in both cold/warm and coastal/oceanic waters challenges current understanding about what drives the biogeography of diazotrophs. This study assessed the community assembly processes of the nitrogen-fixing cyanobacterium UCYN-A, developing a framework of assembly processes underpinning the microbial biogeography and diversity. High-throughput sequencing and a qPCR approach targeting the nifH gene were used to investigate three tropical seas: the Bay of Bengal, the Western Pacific Ocean, and the South China Sea. Based on the neutral community model and two types of null models calculating the b-nearest taxon index and the normalized stochasticity ratio, we found that stochastic assembly processes could explain 66-92% of the community assembly; thus, they exert overwhelming influence on UCYN-A biogeography and diversity. Among the deterministic processes, temperature and coastal/oceanic position appeared to be the principal environmental factors driving UCYN-A diversity. In addition, a close linkage between assembly processes and UCYNA abundance/diversity/drivers can provide clues for the unusual global distribution of UCYN-A.

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