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最深海沉积物中的微生物生态系统和生态驱动力

Xiang Xiao¹, Weishu Zhao¹, Zewei Song²

¹State Key Laboratory of Microbial Metabolism, International Center for Deep Life Investigation (IC-DLI), School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.

|March 7, 2025

概括

深海微生物呈现出高度的新奇性, 这揭示了它们对极端海洋深度的重要适应.

科学领域:

海洋生物学
微生物生态学
海洋学

背景情况:

哈达尔区域是地球最深的海洋领域 (6-11公里),呈现极端条件,历史上难以探索.
了解这些环境中的微生物对于理解深海生态系统至关重要.

研究的目的:

系统地探索哈达尔区的微生物多样性和生态驱动因素.
分析微生物对极端环境的基因组适应.

主要方法:

从马里亚纳海沟,雅普海沟和菲律宾盆地收集了1648个沉积物样本.
使用转基因和16S rRNA基因扩增序列的92Tbp数据集 (MEER数据集) 的生成.
生态驱动因素的分析,包括中性漂移,同质选择 (HoS) 和分散限制 (DL).

主要成果:

发现了7,564种微生物,其中89.4%以前未报告,这表明了重要的分类学新奇性.
均质选择 (50.5%) 和分散限制 (43.8%) 被确定为主要的生态驱动因素,中性漂移的作用最小.
均质选择有利于精简的基因组,具有寡量化和高压适应的功能 (例如,芳香化合物利用,抗氧化).
分散限制促进了多功能新陈代谢和更大的基因组.

结论:

环境因素,特别是同质选择和分散限制,是高微生物分类学新性的主要驱动因素.
在极端的寡和高压条件下,状区域的微生物基因组表现出特殊的适应性.
这项研究促进了对地球最深的海洋环境中微生物生态系统的理解.

关键词:

16S rRNA基因扩增玛丽亚娜·特伦奇适应战略社区集会生态过程质微生物组哈达尔区域基因组测序

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