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Microbiota of a seepage face at the mouth of a subterranean estuary:diversity,distribution and substrate dependence

Acta Oceanologica Sinica 2023年第8期42卷 147-157页

作者： Yueming Wu Yongjun Wei Juan Severino Pino Ibánhez Danqing Sun Kaiqi Lu Qianqian Wang Jian Li Shan Jiang State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China School of Pharmaceutical Sciences Zhengzhou UniversityZhengzhou 450001China Instituto de Investigacións Mariñas Consejo Superior de Investigaciones CientíficasVigo 36208Spain School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China School of Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013China

subterranean estuaries,i.e.,the mixing zone between terrestrial groundwater and recirculated seawater,host a wide range of ***,field campaigns were conducted at the mouth of the subterranean estuary at the Sanggou Bay(Shandong Province,China)over four consecutive seasons at a seepage face(0−20 cm depth).The diversity of benthic microbiome was characterized via 16S rRNA gene sequencing and metagenomics,combined with physic-chemical parameters,e.g.,organic carbon,total nitrogen and sulfate contents in *** spring,the dominant species were assigned to the phylum *** opportunistic species was assigned to Acidobacteria,Actinobacteria and *** key components were identified to be species of the genera Pseudoalteromonas,Colwellia and Sphingobium,indicating the involvement of sediment microbiota in the degradation of sedimentary organic carbon,particularly that of pelagic origin,e.g.,phytoplankton detritus and bivalve *** spring,the microbial community was statistically similar along the depth profiles and among the three sampled *** spatial distributions were obtained in the remaining *** contrast,the dominant species assemblages varied significantly among seasons,with key genera being Thioprofundum and Nitrosopumilus during summer and autumn and Thioprofundum and Ilumatobacter during *** analysis revealed a seasonal shift in benthic nitrogen and sulfur metabolism associated with these variations in microbial community ***,our findings suggested that macro elements derived from pelagic inputs,particularly detrital phytoplankton,shaped the microbial community compositions at the seepage face,resulting in significant seasonal variations,while the influence of terrestrial materials transported by groundwater on the sediment microbiota at the seepage face found to be minor.

关键词： subterranean estuary microbiota seepage face seasonal variation substrate

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Sandy seepage faces as bioactive nitrate reactors:Biogeochemistry,microbial ecology and metagenomics

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Geoscience Frontiers 2023年第3期14卷 74-89页

作者： Shan Jiang Jie Jin Yongjun Wei Ying Wu Yixue Zhang Carlos Rocha Juan Severino Pino Ibánhez Guosen Zhang Jing Zhang State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China School of Pharmaceutical Sciences Key Laboratory of State Ministry of EducationKey Laboratory of Henan Province for Drug Quality Control and EvaluationCollaborative Innovation Center of New Drug Research and Safety EvaluationZhengzhou UniversityZhengzhou 450001HenanChina Biogeochemistry Research Group School of Natural SciencesTrinity College DublinDublin 2Ireland Instituto de Investigacións Mariñas Consejo Superior de Investigaciones Científicas(IIM-CSIC)Eduardo Cabello 636208 VigoSpain School of Oceanography Shanghai Jiao Tong UniversityShanghai 200040China

subterranean estuaries are highly dynamic in processing dissolved inorganic nitrogen(DIN).Here we investigate DIN turnover in surface sediments(0–20 cm depth)at the higher,medium and lower intertidal of a seepage face,i.e.,the outer “mouth”of the subterranean estuary,during four consecutive seasons in Sanggou Bay,*** the studied period,ammonium(NH_(4)^(+))and nitrite(NO_(2)^(-))concentrations in the sampled porewaters did not vary significantly with depth or *** contrast,peaks in porewater nitrate(NO_(3)^(-))concentration and decreases in δ^(15)N-NO_(3)^(-) and δ^(18)O-NO_(3)^(-) were observed in the 15–20 cm depth(bottom)sediment,particularly during summer and *** with NO_(3)^(-) production,the sediment total nitrogen was also markedly peaking in the bottom layer of the studied seepage *** with abundant heterotrophic microbes in the sediment,this NO_(3)^(-) accumulation was linked to a reaction chain including organic matter decomposition,ammonification and *** winter,porewater enrichment in total nitrogen occurred closer to the surface of the seepage face but triggered also active NO_(3)^(-) *** pattern reinforced the importance of pelagic organic matter supply on NO_(3)^(-) *** the shallower depths of the seepage face(<12 cm),active net NO3removal occurred except in *** isotopic fractionation(δ^(15)N-NO_(3)^(-) and δ^(18)O-NO_(3)^(-) and metagenomic results revealed denitrification as the main pathway for NO_(3)^(-) *** assimilation from benthic primary producers may also consume a fraction of NO_(3)^(-) at the sediment water *** NO_(3)^(-) production and removal significantly varied in magnitude with season(13.6 to 6.2 nmol cm^(-3)h^(-1)).Substrate supply was the key driver for nitrate cycling,as evidenced by the high NO3production rate in spring by comparison to *** highest NO_(3)^(-) turnover rates were found in summer,suggesting the comb

关键词： Benthic microbiota Nitrate Stable isotopes subterranean estuary Denitrification

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Seasonal metal fluxes derived by the interaction of surface water and groundwater in an aquaculture estuary

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Acta Oceanologica Sinica 2023年第8期42卷 113-124页

作者： Xiaoxiong Wang Jordi Garcia-Orellana Xiaogang Chen Jianan Liu Fenfen Zhang Jianguo Qu Zhuoyi Zhu Jinzhou Du State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200062China ICTA-UAB Institut de Ciència i Tecnologia AmbientalsUniversitat Autònoma de BarcelonaBarcelona E-08193Spain Departament de Física Universitat Autònoma de BarcelonaBarcelona E-08193Spain Key Laboratory of Coastal Environment and Resources of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China

Submarine groundwater discharge(SGD)plays a major role as a conveyor of metals to coastal ***,the seasonal change of metal fluxes derived through SGD is ***,we evaluated the behaviours and fluxes of trace metals(Mn,Fe,Ba,Pb,U,Cr,Zn,Cu)in an estuary under different seasonal *** behaviours of trace metals revealed that SGD was the source of Mn(3.51 mmol/(m^(2)·d)),Fe(0.174 mmol/(m^(2)·d))and Ba(0.024 mmol/(m^(2)·d)),but the Cu sink(−0.55μmol/(m^(2)·d))and other metals exhibited a seasonal source‒sink *** seasonal variation of dissolved organic matter and the fresh groundwater proportion in subterranean estuaries may have an important effect on metals fluxes especially for the Fe,Mn and *** result shows that the single seasonal metal fluxes estimation applied to the annual scale will cause a large deviation,up to 3.6 times for Fe,5.5 times for Mn,and 15 times for ***,the influence of seasonal fluctuations on SGDderived metal fluxes cannot be ignored,and our findings will be important for comprehending the metal budget and cycle in nearshore environment.

关键词： subterranean estuary seawater intrusion heavy metals seasonal changes coastal management

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