报告详情
Stoichiometric imbalance drives predictable microbial response to enhanced methane flux in marine sediments
编号：736
访问权限：仅限参会人
更新：2026-08-31 18:48:44 浏览：0次
口头报告
报告开始：暂无开始时间（Asia/Shanghai）
报告时间：暂无持续时间
所在会场：[暂无会议] [暂无会议段]
暂无文件
摘要
Deep-sea sediments are dynamic interfaces that link upward methane supply from subseafloor reservoirs with microbial carbon and nutrient cycling across the sediment-water boundary. Yet the ecological principles governing microbial responses to abrupt methane supply remain poorly constrained. We investigated a newly activated methane leakage site at 1,766 m water depth in the Qiongdongnan Basin, South China Sea, where gas-hydrate exploration triggered enhanced methane release. Annual in situ observations from 2022 to 2025, together with adjacent non-seep and mature seep references, allowed us to resolve microbial succession across an early-stage seep-development chronosequence.
By integrating high-resolution sediment geochemistry, metagenomics, community-aggregated trait analysis, genome-scale metabolic modeling and machine learning, we found that methane leakage produced a transient stoichiometric imbalance characterized by elevated dissolved inorganic nitrogen relative to dissolved inorganic carbon. Metagenomic reconstruction of 3,080 species-level representative genomes showed that this shift was accompanied by rapid restructuring of benthic microbial communities: early leakage-impacted sediments were enriched in larger-genome, faster-growing copiotrophs, higher biosynthetic and nitrogen-metabolism potential, and intensified metabolic competition. Over subsequent years, communities progressively moved toward mature seep-like assemblages dominated by slower-growing, more streamlined taxa and stronger metabolic complementarity. Pairwise metabolic modeling further suggested that phylogenetically and genomically divergent taxa formed the strongest cross-feeding relationships, with larger-genome organisms tending to act as metabolite donors and streamlined taxa as recipients.
Resource stoichiometry, particularly the DIN:DIC ratio, emerged as a key predictor of community-weighted genome size, microbial life-history axes and interspecies interaction structure. These trait axes further predicted methane-derived carbon allocation into organic and inorganic carbon pools. Our results reveal a stoichiometry-trait-function framework linking subsurface methane input, sediment biogeochemistry and microbial connectivity at the deep-sea floor, providing a mechanistic basis for forecasting benthic microbial succession and carbon transformation under changing methane fluxes.
By integrating high-resolution sediment geochemistry, metagenomics, community-aggregated trait analysis, genome-scale metabolic modeling and machine learning, we found that methane leakage produced a transient stoichiometric imbalance characterized by elevated dissolved inorganic nitrogen relative to dissolved inorganic carbon. Metagenomic reconstruction of 3,080 species-level representative genomes showed that this shift was accompanied by rapid restructuring of benthic microbial communities: early leakage-impacted sediments were enriched in larger-genome, faster-growing copiotrophs, higher biosynthetic and nitrogen-metabolism potential, and intensified metabolic competition. Over subsequent years, communities progressively moved toward mature seep-like assemblages dominated by slower-growing, more streamlined taxa and stronger metabolic complementarity. Pairwise metabolic modeling further suggested that phylogenetically and genomically divergent taxa formed the strongest cross-feeding relationships, with larger-genome organisms tending to act as metabolite donors and streamlined taxa as recipients.
Resource stoichiometry, particularly the DIN:DIC ratio, emerged as a key predictor of community-weighted genome size, microbial life-history axes and interspecies interaction structure. These trait axes further predicted methane-derived carbon allocation into organic and inorganic carbon pools. Our results reveal a stoichiometry-trait-function framework linking subsurface methane input, sediment biogeochemistry and microbial connectivity at the deep-sea floor, providing a mechanistic basis for forecasting benthic microbial succession and carbon transformation under changing methane fluxes.
关键词
暂无
报告人
Ningyuan Lu
Shanghai Jiao Tong University稿件作者
全部评论
重要日期
-
会议日期
01月12日
2027
至01月15日
2027
-
07月21日 2026
初稿截稿日期
-
01月15日 2027
注册截止日期
主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University (MEL)
Department of Earth Sciences, National Natural Science Foundation of China (NSFC)
Department of Earth Sciences, National Natural Science Foundation of China (NSFC)
联系方式
- Zhijia (Jessica) Ye
- x******@xmu.edu.cn
- +86*********
历届会议
-
2024年12月11日 中国
第七届厦门海洋环境开放科学大会（XMAS 2025） -
2023年01月09日 中国 Xiamen
第六届厦门海洋环境科学开放大会
发表评论