正在确认阅读权限…
Why Deep-Sea Hydrothermal Vents Sustain Ecosystems Without Sunlight
为何深海热液喷口能在无阳光条件下维系生态系统
-
At depths exceeding 2,500 meters, hydrothermal vents release mineral-rich, superheated fluids heated by Earth’s mantle convection—not solar radiation.在超过2500米的深度，热液喷口释放出富含矿物质、由地幔对流而非太阳辐射加热的超高温流体。
-
Chemosynthetic bacteria oxidize hydrogen sulfide and methane from vent effluents, converting chemical energy into organic carbon via the Calvin-Benson cycle variants.化能合成细菌氧化喷口排放物中的硫化氢和甲烷，通过卡尔文-本森循环的变体将化学能转化为有机碳。
-
These microbes form biofilms on chimney surfaces and symbiotic tissues—powering tube worms whose hemoglobin binds both oxygen and sulfide simultaneously.这些微生物在烟囱表面及共生组织中形成生物膜，为管栖蠕虫供能——其血红蛋白可同时结合氧气与硫化物。
-
Vent ecosystems exhibit rapid evolutionary turnover: species endemism exceeds 90%, with new taxa discovered annually despite extreme pressure and acidity.热液喷口生态系统演化更替迅速：特有物种比例超90%，每年仍有新分类单元被发现，尽管环境压力极大且酸性强。
-
Thermal gradients across vent fields create microhabitats supporting diverse trophic levels—from grazing gastropods to predatory octopods.喷口区内的温度梯度形成多种微生境，支撑从食草腹足类到捕食性章鱼类等不同营养级生物。
-
Unlike photosynthetic food chains, chemosynthetic ones lack seasonal fluctuations, enabling year-round reproduction and growth.与光合食物链不同，化能合成食物链无季节波动，支持全年繁殖与生长。
-
Mining proposals for seafloor massive sulfides raise concerns about habitat fragmentation and microbial dispersal barriers.海底块状硫化物采矿提案引发对栖息地破碎化及微生物扩散障碍的担忧。
-
Regulatory frameworks now require baseline metagenomic surveys to assess functional redundancy before permitting extraction activities.现行监管框架要求在批准开采活动前，开展基线宏基因组调查以评估功能冗余。
-
Laboratory simulations replicate vent chemistry to study enzyme thermostability—inspiring industrial catalysts operating above 120°C.实验室模拟热液化学环境以研究酶的耐热性，启发开发可在120°C以上运行的工业催化剂。
-
Critically, vent fluid composition varies geologically: ultramafic-hosted systems generate hydrogen-rich effluents favoring methanogens over sulfide oxidizers.关键在于，热液流体成分因地而异：超镁铁岩赋存系统产生富氢流体，更利于产甲烷菌而非硫化物氧化菌。
-
This geochemical diversity implies life’s metabolic plasticity extends far beyond terrestrial biochemical constraints.这种地球化学多样性表明，生命的代谢可塑性远超陆地生化限制。
-
Thus, hydrothermal vents redefine habitability—not as a planetary surface condition, but as a localized thermodynamic disequilibrium.因此，热液喷口重新定义了宜居性——它并非行星表面条件，而是局部的热力学不平衡状态。