电缆细菌延迟了eocinia,并在沿海低氧系统中调节了释放
Laurine D W Burdorf1, Sebastiaan J van de Velde1, Silvia Hidalgo-Martinez1
1Geobiology Research Group, Department of Biology, University of Antwerp, Antwerp, Belgium.
Royal Society open science
|April 18, 2024
概括
电缆细菌通过氧化硫化铁产生"铁防火墙". 这一过程防止了硫化的释放,并控制了沿海沉积物中的释放.
科学领域:
- 微生物生态学 微生物生态学
- 生物地质化学生物地质化学
- 环境科学环境科学
背景情况:
- 电缆细菌是有线状微生物,具有独特的电子传输能力.
- 他们在季节性低氧沉积物中壮成长,影响铁和硫循环.
- 它们的新陈代谢溶解了硫化铁 (FeS),释放出有铁的铁 (Fe2+).
研究的目的:
- 为了实验性地研究电缆细菌所提出的"铁壁防火墙假说".
- 评估电缆细菌在控制沉积物中硫化 (H2S) 和 (P) 释放中的作用.
- 了解电缆细菌对沿海生物地球化学循环的季节性影响.
主要方法:
- 从一个季节性低氧盆地收集自然沉积物核心,跨越三个季节.
- 在无毒条件下化未受干扰的沉积物核心.
- 140天内对硫化 (H2S),溶解铁 (dFe) 和酸盐 (PO43-) 的排放量进行监测.
主要成果:
- 带有活跃电缆细菌的沉积物核心显示出大量的铁氧化氧化物 (FeOx).
- 这种FeOx层延迟了H2S的流出,长达102天.
- 证据支持电缆细菌在保留H2S和调节P释放中的作用.
结论:
- 电缆细菌建立了一个"铁防火墙",有效地防止H2S的释放.
- 这种机制在调节释放和防止沿海环境中的euginia方面发挥着至关重要的作用.
- 这些发现强调了电缆细菌在海洋沉积物生物地质化学中的生态重要性.
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