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Bridging microbial diversity and chemodiversity of dissolved organic matter to better constrain processes in biogeochemical cycles
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Deciphering associations between dissolved organic molecules and microbial communities in the Pearl River Estuary
Tuesday 8th @ 1130-1150, Concert Hall
Wei Xie* , School of Marine Sciences, Sun Yat-sen University
Penghui Li, South China University of Science and Technology
Chen He, China University of Petroleum
Ding He, School of Earth Sciences, Zhejiang University
Quan Shi, China University of Petroleum
Chuanlun Zhang, South China University of Science and Technology
Presenter Email: xiewei9@sysu.edu.cn |
| populated and economically developed region, and discharging into the South China Sea through the Pearl River Estuary (PRE). The Estuary can be considered as a large-scale, natural biogeochemical laboratory, characterized by pronounced physicochemical gradients of nutrients, salinity, terrestrial organic matter inputs, and other parameters. In this study, high throughput sequencing targeting 16S rRNA genes was conducted to reveal the changes of microbial communities along the environmental gradient of PRE. At the same time, the molecular composition of solid-phase extraction (SPE) dissolved organic matter (DOM) along PRE gradient were analyzed by negative-ion electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). The results from SPE-DOM exhibited a total of 65 heteroatom class species assigned from a single mass spectrum, in which CHO class species were dominant. The aromatic index (AI), which was used to identify the polyaromatic hydrocarbons in DOM, was negatively correlated with salinity, suggesting the gradually dilution or biological degradation of those polyaromatic hydrocarbons during the migration from the river to the sea. Pearson's correlation analysis for the community structures and DOM molecular compositions revealed that Sphingomonadales and Burkholderriale were the most two significant bacteria that showed positively correlated with AI, suggesting those bacteria might live on those polyaromatic hydrocarbons. Collectively, our study shed light on exploring the complex relationship between microbes and DOM in estuarine environments. |
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