Linking Bacterial Communities to Optical-Derived Properties of Porewater DOM in Sediments in the Coastal East China Sea
Linking Bacterial Communities to Optical-Derived Properties of Porewater DOM in Sediments in the Coastal East China Sea
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DOI：
10.3389/fmars.2022.919368
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Minchun Li;W. Xie;Chuanlun Zhang;Kedong Yin
中科院分区：
文献类型：
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作者：
Minchun Li;W. Xie;Chuanlun Zhang;Kedong Yin
在沉积环境中，细菌群落和孔隙水溶解有机质(DOM)池是密切相互作用的。就DOM的来源和新鲜度而言，河口沿海地区是陆地和海洋影响相互作用的地区。然而，我们对这些地区细菌群落和DOM之间的关系知之甚少。本研究采集了东中国海岸带42个点的孔隙水DOM样品。用荧光光谱和吸收光谱测定了孔隙水DOM的光学性质，用16S rRNA基因高通量测序检测了沉积物中相应的细菌群落组成。结果表明，基于DOM的光学性质，细菌物种丰富度与多个陆源指标呈正相关，这表明陆源非均质DOM在海洋沉积物中可能包含更广泛的细菌类群。细菌群落共生网络分析表明，低DOM新鲜度样品的边缘密度分别是高DOM新鲜度样品的3.4倍和3倍。这表明，在较低的DOM新鲜度条件下，细菌类群之间的联系得到了增强，降低DOM的新鲜度可能会鼓励更多的资源互补利用。这些发现为海岸沉积物中微生物参与的非均质有机质利用的相互作用过程提供了新的见解。
Bacterial communities and porewater dissolved organic matter (DOM) pool are intimately interactive in sedimentary environments. Estuarine coastal regions are an interactive area between terrestrial and marine influences in terms of DOM origins and freshness. Yet, we know little about the relationships between the bacterial communities and DOM in those regions. In this study, porewater DOM samples were collected from 42 sites in the coastal East China Sea. The porewater DOM optical properties were determined by fluorescence and absorption spectra, while the corresponding bacterial community compositions of those sediments were examined by 16S rRNA gene high-throughput sequencing. The results showed that bacterial species richness was positively correlated with multiple terrestrial indicators based on the optical properties of DOM, which implied that heterogeneous DOM from terrestrial origins might harbor a wider spectrum of bacterial taxa in marine sediments. The analysis of the co-occurrence network of the bacterial communities showed that the edges and density for samples with low DOM freshness were 3.4 times and 3 times those for the samples with high DOM freshness, respectively. This suggested that the connection among the bacterial taxa under the lower DOM freshness condition were enhanced and that reduced freshness of DOM may encourage more complimentary utilization of resources. The findings provide a new insight into such interactive processes of heterogeneous organic matter utilization meditated by microorganisms in coastal sediments.