Physiological trade-offs drive the archaeal dominance and carbon turnover in deep subsurface
生理的代償関係が深部地下の古細菌優位性と炭素代謝回転を駆動する (AI 翻訳)
Jialin Hou, Lewen Liang, Liuyang Li, Weikang Sui, Liang Dong, Longhui Deng, Haining Hu, Zijun Wu, Lin Zhang, Orit Sivan, James A Bradley, Fang Wang
🤖 gxceed AI 要約
日本語
東シナ海の深海堆積物において、古細菌（特にBathyarchaeia）が深度とともに細菌を体系的に排除し、純成長帯を形成することを発見。マルチオミクス解析と生体エネルギー論モデルにより、この移行は難分解性有機炭素の持続的代謝と、成長より維持を優先する生理的代償関係によって駆動され、深部での死亡率を最小化することを示した。Bathyarchaeiaが埋没1000年後の全有機炭素分解の約77％を担うと推定。
English
In deep East China Sea sediments, archaea (especially Bathyarchaeia) systematically displace bacteria with depth, forming net growth zones. Multi-omics and bioenergetic modeling show this transition is driven by sustained metabolism of recalcitrant organic carbon and a physiological trade-off prioritizing maintenance over growth, minimizing mortality. Bathyarchaeia mediate ~77% of total OC degradation after 1,000 years burial, corresponding to ~18% of millennial OC degradation in global shelf sediments.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
同研究は東シナ海を対象とし、日本の排他的経済水域に隣接する海域のデータを含む可能性がある。日本のブルーカーボン政策や海洋堆積物中の炭素貯留評価に間接的に寄与するが、直接的なGX政策との関連性は低い。
In the global GX context
This study provides mechanistic insights into long-term organic carbon preservation in marine sediments, a key component of global carbon cycle feedbacks. While not directly addressing climate mitigation technologies, it informs carbon accounting for natural sinks and could support climate model parameterization.
👥 読者別の含意
🔬研究者:This paper reveals physiological mechanisms behind archaeal dominance in deep sediments and their role in long-term carbon turnover, offering a new perspective for biogeochemistry and carbon cycle modeling.
📄 Abstract（原文）
Marine sediments host a vast deep biosphere, yet how microorganisms persist under severe energy limitation and govern long-term organic carbon (OC) preservation remains poorly understood. Here we show that archaea, primarily Bathyarchaeia, systematically displace bacteria with depth and form net growth zones across East China Sea shelf deep sediments. Multi-omics analyses and bioenergetic modelling reveal that this transition is driven by sustained archaeal metabolism of diverse recalcitrant OC compounds, and a physiological trade-off that prioritizes cellular maintenance over growth, minimizing mortality in deep sediments. This strategy triggers a fundamental shift in sedimentary carbon turnover: from rapid bacterial degradation of labile OC near the surface to persistent archaea-driven turnover of recalcitrant OC at depth. We estimate that Bathyarchaeia mediate ~77% of total OC degradation after 1,000 years of burial, corresponding to ~18% (~11.4 Pg C) of millennial OC degradation in global shelf sediments. These findings identify subsurface archaea as key microbial regulators of long-term OC preservation and reveal how physiological trade-offs sustain life and carbon turnover in the energy-limited deep biosphere.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.64898/2026.05.21.726758first seen 2026-05-24 04:47:17 · last seen 2026-06-16 04:49:54
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