海底热液烟囱体中微生物多样性研究进展

Research progress on microbial diversity in seafloor hydrothermal chimneys

  • 摘要: 海底热液喷口是地球内部与海洋之间重要的物质和能量交换通道,其地质背景决定了喷出流体的化学成分。热液烟囱体是海底热液喷口的典型结构与生态单元,栖息着类型多样且生理功能各异的微生物类群。这些微生物能够利用高温热液与低温海水之间的化学不平衡或通过各种硫化物矿物风化蚀变获取维持自身代谢所必须的能量,并根据陡峭的温度、pH、Eh和还原化合物浓度的环境梯度,选择性地分布在烟囱体的各种生态位中。基于高通量测序和组分分析发现,烟囱体中微生物生命过程中涉及到的营养代谢类型包含硫氧化、硫还原、甲烷氧化、产甲烷、氢营养、铁氧化、硝化及反硝化等多种代谢方式,暗示了它们在全球元素循环中的潜在作用。本文系统地总结了在全球范围内热液烟囱体中栖息的微生物群系及其分布特征与变化规律,有利于全面、系统地认识和理解热液微生物的生存策略及其对环境的响应机制以及热液微生物参与的地球化学循环。

     

    Abstract: Seafloor hydrothermal vents serve as crucial conduits for material and energy exchange between the Earth's interior and the ocean, with their geological background playing a pivotal role in determining the chemical composition of the expelled fluid. Hydrothermal chimney stands as a quintessential structural and ecological unit within submarine hydrothermal vents, housing a diverse array of microbial groups with varying physiological functions. These microorganisms can use the chemical imbalance between high-temperature hydrothermal solution and low-temperature seawater or through weathering of various sulfide minerals to obtain the energy necessary to maintain their metabolism, and they are selectively distributed in various ecological niches in the chimney body along big environmental gradients of temperature, pH, Eh, and reducing compound concentration. Through high-throughput sequencing and omics analysis, it has been revealed that the nutrient metabolism types driving microbial life processes within the chimney encompass sulfur oxidation, sulfur reduction, methane oxidation, methane production, hydrogen nutrition, iron oxidation, nitrification and denitrification, and various other chemoautotrophic metabolic pathways, which suggests their potential significance in shaping the global element cycle. This paper provides a comprehensive and systematic overview of the microbiomes present in hydrothermal chimneys worldwide, including their distribution characteristics and variation patterns, contributing to the comprehensive and systematic understanding on hydrothermal microbial survival strategies, environmental adaptation mechanisms, and geochemical cycles involving hydrothermal microorganisms.

     

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