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Benthic microbial biogeography along the continental shelf shaped by substrates from the changjiang river plume

Acta Oceanologica Sinica 2022年第1期41卷 118-131页

作者： Yongjun Wei Shan Jiang Lingmin Tian Liping Wei Jie Jin Juan Severino Pino Ibanhez Yan Chang Xiaodao Wei Ying Wu Key Laboratory of Advanced Drug Preparation Technologies of Ministry of Education School of Pharmaceutical SciencesZhengzhou UniversityZhengzhou 450001China State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China Department of Food Science and Engineering Jinan UniversityGuangzhou 510632China Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China School of Natural Sciences Trinity College DublinDublin 2Ireland Instituto de Investigacions Marinas Consejo Superior de Investigaciones CientificasVigo 36208Spain Institute of Eco-Chongming East China Normal UniversityShanghai 202162China

Coastal zones are active reactors of continental material including that transported by rivers via a series of microbiota-mediated reactions. Nevertheless, current knowledge of the ecology and functioning of the microbiota in coastal areas affected by large riverine inputs remains insufficient on a global scale. Here, an investigation on sediment microbial composition, including taxonomy and metabolic network, as well as their relationship with major benthic reaction substrates, namely carbon, nitrogen, sulphur and phosphorus, was conducted in the continental shelf affected by the spread of the changjiang river plume. Surface sediment samples(48 samples)were collected during March 2018, obtaining a mean Operational Taxonomic Units(OTUs) number of 3 ***, Acidobacteria and Actinobacteria were abundant phyla in the studied sediments. Bray-Curtis distance analysis classified the 48 samples into 4 clusters(MG1 to MG4) at the phylum-level. MG1 and MG2 are found near the river mouth, receiving substantial land-derived particles from the changjiang river ***-attached microbes may be settled in these regions and influenced the observed sediment microbial diversity and biomass, e.g., increased Crenarchaeota relative abundance. The relative enrichment of these two groups in heterotrophic microbes further suggests a reliance of benthic microbiota on substrates with terrestrial origin, particularly specialized on processing sulphur-rich substrates. Regions MG3 and MG4 are located in the outer margin of the area affected by the changjiang river plume, mainly fed by settling pelagic particles from phytoplankton. Compared to MG1 and MG2, a significant increase in the abundance of Thaumarcheota(phylumlevel) and Nitrosopumilus(genus-level) was found in MG3, suggesting nitrogen-related transformations as the key reactions to sustain microbial metabolism in this region. Coupled with the identified variations in the taxonomic composition, significant differenc

关键词： benthic microbiota biogeography benthic substrate changjiang river plume East China Sea Yellow Sea

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Observations of turbulent mixing and vertical diff usive salt fl ux in the changjiang Diluted Water

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Journal of Oceanology and Limnology 2022年第4期40卷 1349-1360页

作者： Baisu ZHU Wei YANG Chengfei JIANG Tao WANG Hao WEI School of Marine Science and Technology Tianjin UniversityTianjin 300072China Key Laboratory of Marine Environment and Ecology Ocean University of ChinaQingdao 266100China

Based on microstructure measurements from a repeated sampling station southwest of the Jeju Island during summer,we studied the hydrography,pycnocline turbulence,and vertical salt fl ux in the changjiang Diluted Water(CDW).The water column was well stratifi ed with the CDW occupied the surface~20 *** of the large turbulent kinetic energy dissipation rate(ε)were found in the bottom boundary ***,intermittent strong turbulence(ε>10^(-6) W/kg)occurred in the pycnocline,which may induce strong mixing events and increase the vertical diff usive salt fl ux at the base of CDW by one order of *** daily-mean vertical diff usive salt fl ux could reach 4.3(2.1,8.9)×10^(-6) m/*** moored velocity measurements and associated wavelet analysis showed the presence of velocity fl uctuations when there was strong pycnocline *** moderate resolution imaging spectroradiometer(MODIS)satellite images further suggest that the velocity fl uctuations are induced by the prevailing internal solitary waves(ISWs)which are mainly generated at the shelf break of the East China Sea or the topographic features surrounding Jeju *** calculated gradient Richardson number denote the occurrence of shear instability in the pycnocline when strong turbulence *** presented results have strong implications for the importance of ISWs in infl uencing the vertical diff usion of CDW and changes in other properties.

关键词： turbulence vertical salt flux internal solitary wave changjiang river plume

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Environmental control of mesozooplankton community structure in the Hangzhou Bay, China

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Acta Oceanologica Sinica 2016年第10期35卷 96-106页

作者： SUN Dong LIU Zhensheng ZHANG Jing WANG Chunsheng SHAO Qianwen Laboratory of Marine Ecosystem and Biogeochemistry Second Institute of OceanographyState Oceanic Administration State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration

A quarterly study of mesozooplankton community structure and environmental variables in the Hangzhou Bay was conducted to examine the response of mesozooplankton community to the variation of water mass and environmental condition. The southeast coast of China is a typical region under the intensive influence of Asia monsoon and freshwater discharge from rivers. The water mass and environmental condition of the Hangzhou Bay, which were influenced by the interaction of currents, freshwater discharge of the Qiantang river and changjiang river plume, showed significant seasonal variation. Our results showed that both biomass and abundance were significantly higher in summer（（247.7±148.8） mg/m^3 and（350.9±215.6） ind./m^3, respectively）than those in other seasons. Four eco-geographical regions were divided based on the cluster analysis of zooplankton community of the Hangzhou Bay throughout the year, except for winter. Monsoon and the dissolved inorganic nitrogen（DIN） input from freshwater discharge of the Qiantang river and changjiang river resulted in temporal and spatial variations of environmental gradient in the Hangzhou Bay, which significantly influenced the structure of mesozooplankton community. Redundancy analysis（RDA） indicated that the mesozooplankton community structure was strictly correlated with the DIN gradient, while salinity gradient showed a weak influence in the Hangzhou Bay.

关键词： zooplankton monsoons dissolved inorganic nitrogen changjiang river plume community composition East China Sea

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