Zhong Song, Feng Jingchun, Kong Jie, Huang Yongji, Chen Xiao, Zhang Si
Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Research Centre of Ecology & Environment for Coastal Area and Deep Sea, Guangdong University of Technology, Guangzhou 510006, China.
Microorganisms. 2023 Dec 18;11(12):3001. doi: 10.3390/microorganisms11123001.
Cold seeps are highly productive chemosynthetic ecosystems in the deep-sea environment. Although microbial communities affected by methane seepage have been extensively studied in sediments and seawater, there is a lack of investigation of prokaryotic communities at the surface sediments and bottom seawater. We revealed the effect of methane seepage on co-occurrence networks and ecological niches of prokaryotic communities at the surface sediments and bottom seawater in the Haima cold seep. The results showed that methane seepage could cause the migration of Mn and Ba from the surface sediments to the overlying seawater, altering the elemental distribution at seepage sites (IS) compared with non-seepage sites (NS). Principal component analysis (PCA) showed that methane seepage led to closer distances of bacterial communities between surface sediments and bottom seawater. Co-occurrence networks indicated that methane seepage led to more complex interconnections at the surface sediments and bottom seawater. In summary, methane seepage caused bacterial communities in the surface sediments and bottom seawater to become more abundant and structurally complex. This study provides a comprehensive comparison of microbial profiles at the surface sediments and bottom seawater of cold seeps in the South China Sea (SCS), illustrating the impact of seepage on bacterial community dynamics.
冷泉是深海环境中高产的化学合成生态系统。尽管受甲烷渗漏影响的微生物群落已在沉积物和海水中得到广泛研究，但对表层沉积物和底层海水中的原核生物群落缺乏调查。我们揭示了甲烷渗漏对海马冷泉表层沉积物和底层海水中原核生物群落共现网络和生态位的影响。结果表明，甲烷渗漏可导致锰和钡从表层沉积物迁移到上覆海水中，与非渗漏位点（NS）相比，改变了渗漏位点（IS）的元素分布。主成分分析（PCA）表明，甲烷渗漏导致表层沉积物和底层海水之间细菌群落的距离更近。共现网络表明，甲烷渗漏导致表层沉积物和底层海水之间的相互连接更加复杂。总之，甲烷渗漏导致表层沉积物和底层海水中的细菌群落变得更加丰富且结构复杂。本研究全面比较了南海（SCS）冷泉表层沉积物和底层海水的微生物概况，阐明了渗漏对细菌群落动态的影响。
