不活跃的热水风口微生物群落是深海初级生产力的重要贡献者
Amanda M Achberger1, Rose Jones2, John Jamieson3
1Department of Oceanography, Texas A&M University, College Station, Texas, USA. aachberger@tamu.edu.
Nature microbiology
|January 29, 2024
概括
不活跃的热水矿床上的微生物群落积极固定碳,为深海有机碳生产做出了重大贡献. 这些发现强调了这些看似休眠的地点在海洋生态系统中的关键作用.
科学领域:
- 深海生物学 深海生物学
- 地质化学 地质化学
- 微生物生态学 微生物生态学
背景情况:
- 活跃的热水喷口支持高生产率,但最终停止活动,留下矿产沉积物.
- 在这些不活跃的沉积物上,微生物活动率的了解很少.
研究的目的:
- 在不活跃的热水矿床上调查初级生产.
- 量化这些地点对深海有机碳生产的贡献.
主要方法:
- 测量14C二碳酸盐的加入,以评估碳固定率.
- 使用单细胞吸收实验和纳米级二次离子质谱 (nanoSIMS).
- 进行了微生物群落的元基因组和脂质组调查.
主要成果:
- 不活跃沉积物的微生物群落以与活跃喷口相比的速度固定无机碳.
- 化学自营细胞占活跃细胞的很大一部分 (> 30%).
- 阿尔法蛋白质细菌和胺蛋白质细菌占主导地位,利用卡尔文-本森-巴什姆通路.
结论:
- 不活跃的热液沉积物是微生物活动的重要地点.
- 这些沉积物有助于在深海产生新的有机碳.
- 化学自营微生物群落在这些地点的碳循环中发挥着关键作用.
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