垂直分层的微生物多样性和关键物种驱动着在马盖伦海底山沉积物中的元素循环
Chengcheng Li1,2, Huameng Ge1, Wenhao Huang1
1Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, PR China.
Microbial genomics
|December 5, 2025
概括
深海的多金属结节是多样化的 prokaryotic 社区的主机. 微生物多样性随着深度的下降而减少,受金属梯度和沉积物组成的影响,揭示了适应性的硫代谢策略.
科学领域:
- 深海微生物学 深海微生物学
- 生物地质化学生物地质化学
- 海洋地质学 海洋地质学
背景情况:
- 多金属结节中含有丰富的贵重金属,如和.
- 马盖伦海底山脉是一个独特的深海息地,沉积速度超慢,金属梯度极低.
- 在多金属结节下面的 Prokaryotic 社区的了解很少,特别是它们的垂直分布和生态作用.
研究的目的:
- 研究多金属结下的沉积物中 prokaryotic 社区的垂直分布和多样性.
- 分析环境因素,包括金属度和深度,对微生物群落结构的影响.
- 了解微生物群落的功能性适应,特别是硫代谢,在这种极端环境中.
主要方法:
- 16S rRNA基因扩增序列测序和沉积物核心 (0-20厘米) 的元基因组分析.
- 使用香农指数对 prokaryotic 多样性的分析.
- 122个元基因组组装基因组 (MAG) 的组装和基因丰度分析.
主要成果:
- 随着沉积物深度的增加, Prokaryotic 的多样性显著下降 (Shannon 指数从 9.446 降至 2.288).
- 主导的种类包括蛋白质细菌,Crenarchaeota,Chloroflexi和Bacteroidota.
- 微生物群落结构主要受到深度,MnO,Fe2O3和重金属 (Cr,Zn,Cu) 的影响.
- 在表面和底层之间观察到明显的微生物共发生网络结构.
- 硫代谢基因 (sox, cys, dsr) 的丰富性随着深度而变化,表明了等级性适应.
结论:
- 在多金属结节下的深海微生物群体表现出显著的垂直分层.
- 金属梯度和深度等环境因素是微生物社区结构和功能的主要驱动因素.
- 这些发现提供了关于微生物在寡头性环境中的弹性以及对深海采矿的影响的见解.
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