生物地球化学循环
潮间带
氮气循环
生态学
缺氧水域
环境化学
生物地球化学
沉积物
反硝化
古细菌
环境科学
生物
化学
氮气
细菌
古生物学
遗传学
有机化学
作者
Yuhui Niu,Zhirui An,Dengzhou Gao,Feiyang Chen,Jie Zhou,Bolin Liu,Lin Qi,Li Wu,Zhuke Lin,Guoyu Yin,Xia Liang,Huicong Dong,Min Liu,Lijun Hou,Yi Zheng
标识
DOI:10.1016/j.scitotenv.2023.165663
摘要
Tide-driven hydrodynamic process causes significant geochemical gradients that influence biogeochemical cycling and ecological functioning of estuarine and coastal ecosystems. However, the effects of tidal dynamics on microbial communities, particularly at the functional gene level, remain unclear even though microorganisms play critical roles in biogeochemical carbon (C), nitrogen (N) and sulfur (S) cycling. Here, we used 16S rRNA gene amplicon sequencing and microarray-based approach to reveal the stratification of microorganisms related to C, N and S cycles along vertical redox gradients in intertidal wetlands. Alpha-diversity of bacteria and archaea was generally higher at the deep groundwater-sediment interface. Microbial compositions were markedly altered along the sediment profile, and these shifts were largely due to changes in nutrient availability and redox potential. Furthermore, functional genes exhibited redox partitioning between interfaces and transition layer, with abundant genes involved in C decomposition, methanogenesis, heterotrophic denitrification, sulfite reduction and sulfide oxidation existed in the middle anoxic zone. The influence of tidal dynamics on sediment function was highly associated with redox state, sediment texture, and substrates availability, leading to distinct distribution pattern of metabolic coupling of microbes involved in energy flux and elemental cycling in intertidal wetlands. These results indicate that tidal cycles are critical in determining microbial community and functional structure, and they provide new insights into sediment microbe-mediated biogeochemical cycling in intertidal habitats.
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