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Human activity over natural inputs determines the bacterial community in an ice core from the Muztag ata glacier

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Science China Earth Sciences 2024年第5期67卷 1489-1499页

作者： Yongqin LIU nianzhi jiao Mukan JI Keshao LIU Baiqing XU Bixi GUO Tandong YAO State Key Laboratory of Tibetan Plateau Earth System Resources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Center for Pan-third Pole Environment Lanzhou UniversityLanzhou 730013China University of Chinese Academy of Sciences Beijing 100101China State Key Laboratory for Marine Environmental Science Xiamen UniversityXiamen 361102China

Ice core provides a valuable vertical timeline of past climates and anthropogenic *** proxies have been widely used in these studies,but there are few biological indicators *** address this gap,we investigated the bacterial community from a 74 m ice core of Muztag ata glacier on the Tibetan Plateau to link biological indicators with past climate and anthropogenic *** analyzing the portion of the ice core with environmental proxies available(corresponding to 1907 to 1991),we observed an increase in bacterial richness throughout the ice core,which was associated with higher NH_(4)^(+),an indicator of agricultural *** bacterial community was jointly determined by human activity,natural input,and air temperature,with a strong human influence after the ***,the relative abundance of animal gut-associated bacteria,including Aerococcaceae,Nocardiaceae,Muribaculaceae,and Lachnospiraceae,was associated with livestock number changes in the Central Asian *** with other bacterial lineages,they jointly explained 59.8%of the livestock number *** study provides quantitative evidence of the associations between bacterial indicators and past climate and human activities,highlighting the potential of using bacterial proxies for ice core studies.

关键词： Ice core of Muztag ata glacier Climate change and anthropogenic activity Biological indicator Gut-associated bacteria livestock number in the Central Asian region

Adaptive strategies of high and low nucleic acid prokaryotes in response to declining resource availability and selective grazing by protozoa

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Science China Earth Sciences 2024年第6期67卷 1872-1884页

作者： Chen HU Liuqian YU Xiaowei CHEN Jihua LIU Yao ZHANG John BATT Xilin XIAO Qiang SHI Rui ZHANG Tingwei LUO nianzhi jiao Dapeng XU College of the Environment and Ecology Xiamen UniversityXiamen 361102China State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesFujian Key Laboratory of Marine Carbon SequestrationXiamen UniversityXiamen 361102China Joint Lab for Ocean Research and Education(LORE)of Dalhousie University Canadaand Shandong University and Xiamen UniversityXiamen 361102China Earth Ocean and Atmospheric Sciences ThrustThe Hong Kong University of Science and Technology(Guangzhou)Guangzhou 510000China Institute of Marine Science and Technology Shandong UniversityQingdao 266237China Department of Oceanography Dalhousie UniversityHalifaxNova Scotia B3H 4R2Canada Institute for Advanced Study Shenzhen UniversityShenzhen 518060China Carbon Neutral Innovation Research Center Xiamen UniversityXiamen 361102China

Prokaryotes play a fundamental role in global ocean biogeochemical ***,how the abundance and metabolic activity of ecologically distinct subgroups(i.e.,high nucleic acid(HNA)and low nucleic acid(LNA)cells),and their regulating factors,change in response to changing marine environmental conditions remains poorly ***,we delved into the time-evolving dynamic responses of the HNA and LNA prokaryotic subgroups to declining resource availability and selective grazing by protozoa by conducting a 73-day incubation experiment in a large-volume(117,000 L)macrocosm that facilitates community-level *** found that the metabolic activity of the HNA subgroup was higher than that of the LNA subgroup when the macrocosm was resource replete but that the HNA subgroup declined more rapidly than the LNA subgroup as the resources became increasingly scarce,leading to a steadily increasing contribution of LNA cells to prokaryotic ***,as resources in the macrocosm became limited,protozoan grazing preference shifted from the HNA to the LNA subgroup and the contributions of the LNA subgroup to the carbon flow within the macrocosm *** findings highlight the resilience of LNA cells in resource-limited environments,illuminate the critical role of selective grazing by protozoa in balancing distinct prokaryotic subgroups under changing resource conditions,and demonstrate the complex and adaptive interactions between protozoa and prokaryotes across diverse environmental contexts.

关键词： Microbial loop Macrocosm experiment Prokaryote Top-down and bottom-up controls Carbon flow

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Virus-Host Interactions Drive Contrasting Bacterial Diel Dynamics in the Ocean

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Research 2024年第2期6卷 389-399页

作者： Xiaowei Chen Chen Hu Wei Wei Yunlan Yang Markus G.Weinbauer Hongbo Li Shiying Ren Ruije Ma YVibin Huang Tingwei Luo nianzhi jiao Rui Zhang State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesFujian Key Laboratory of Marine Carbon SequestrationXiamen UniversityXiamen 361102PR China College of the Environment and Ecology Xiamen UniversityXiamen 361102PR China Research Center for Environmental Ecology and Engineering School of Environmental Ecology and Biological EngineeringWuhan Institute of TechnologyWuhan 430205PR China Sorbonne Universités UPMCUniversitéParis 06CNRSLaboratoire d'Oceanographie de Villefranche(LOV)Villefranche-sur-Mer 06230France National Marine Environmental Monitoring Center Ministry of Ecological EnvironmentDalian 116023PR China Department of Ocean Sciences University of CaliforniaSanta CruzCAUSA NOAA/OAR Pacific Marine Environmental Laboratory SeattleWAUSA Institute for Advanced Study Shenzhen UniversityShenzhen 518055PR China

Marine organisms perform a sea of diel *** diel dynamics have been shown to be driven by light,energy resources,circadian rhythms,and the coordinated coupling of photoautotrophs and heterotrophic ***,we explore the diel fluctuation of viral production and decay and their impact on the total and active bacterial community in the coastal and open seawaters of the South China *** results showed that the night-production diel pattern of lytic viral production was concurrent with the lower viral decay at night,contributing to the accumulation of the viral population size during the night for surface *** diel variations in bacterial activity,community composition,and diversity were found highly affected by viral *** was revealed by the finding that bacterial community diversity was positively correlated to lytic viral production in the euphotic zone of the open ocean but was negatively related to lysogenic viral production in the coastal *** distinct but contrasting correlations suggest that viral life strategies can not only contribute to diversifying bacterial community but also potentially piggyback their host to dominate bacterial community,suggesting the tightly synchronized depth-dependent and habitat-specific diel patterns of virus-host *** further implies that viruses serve as an ecologically important driver of bacterial diel dynamics across the ocean,highlighting the viral roles in bacterial ecological and biogeochemical processes in the ocean.

关键词： coastal ocean Marine

A holistic perspective on Earth system science

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Science China Earth Sciences 2024年第10期67卷 3013-3040页

作者： Yongfei ZHENG Zhengtang GUO nianzhi jiao Mu MU Shilong PIAO Suiyan FU Dinghui YANG Maoyan ZHU State Key Laboratory of Lithospheric and Environmental Coevolution School of Earth and Space SciencesUniversity of Science and Technology of China State Key Laboratory of Lithospheric and Environmental Coevolution Institute of Geology and Geophysics Chinese Academy of Sciences School of Ocean and Earth Sciences Xiamen University Department of Atmospheric and Oceanic Sciences Fudan University School of Environment Peking University School of Earth and Space Sciences Peking University Department of Mathematical Sciences Tsinghua University Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences

Earth system can be categorized into three parts, solid Earth system, surface Earth system, and Sun-Earth space system. These three subsystems not only have mutual transmission and coupling relationships in both energy and matter but also involve multiple scales from microscopic to macroscopic. Earth system science is characterized by its globality and unity with a holistic view and a systematic view at multiple scales in both space and time. It focuses not only on the physical, chemical and biological interactions between various geospheres but also on the properties, behaviors, processes, and mechanisms of the entire Earth and its spheres. Although significant progress has been made in the study of internal disciplines of these three subsystems,there is still insufficient understanding of their overall behavior and interactions between individuals, thus facing challenges of different types and levels. The solid Earth system is composed of the crust, mantle, and core. Existing observational techniques struggle to penetrate deep into the mantle, making direct observation and data acquisition difficult; the extreme environments within Earth, such as high temperature, high pressure, and strong magnetic fields, also pose great challenges to observational equipment and scientific experiments. The surface Earth system is an open complex mega-system, in which there are complex interactions and feedback mechanisms among its geospheres(such as atmosphere, hydrosphere, biosphere, pedosphere and lithosphere), leading to difficulties in understanding of its overall behavior and long-term evolution. Biological activities have become increasingly significant in affecting the surface Earth system. The coupling between the internal and external Earth systems becomes more complex. Distinguishing and quantifying the impacts of Earth spherical interactions and biological activities on the surface Earth system is a major challenge. The Sun-Earth space system involves multiple physical

关键词： Earth’s interior Earth’s exterior Geospheres Energy exchange Material transfer

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Removal of competing bacteria in coral microbiome through“trojan virus”:A newly discovered mechanism of coral pathogenicity

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Science China Earth Sciences 2023年第8期66卷 1906-1908页

作者： nianzhi jiao Fujian Key Laboratory of Marine Carbon Sequestration Carbon Neutral Innovation Research CenterCollege of Ocean and Earth Sciences and State Key Laboratory of Marine Environmental ScienceXiamen UniversityXiamen 361005China

Coral reefs are underwater ecosystems characterized by reefbuilding *** reefs are complex three-dimensional structures formed by colonies of coral polyps held together by calcium carbonate,and play an important role in the global carbon cycle(Kinsey and Hopley,1991).Although coral reefs cover only approximately 0.5% of the global sea floor,they serve various ecological functions,such as ecological resource restoration,environmental regulation。

关键词： coral carbonate Coral

Ocean-based climate actions recommended by academicians from Europe and China

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Science China Earth Sciences 2022年第8期65卷 1612-1614页

作者： Jean-Pierre GATTUSO nianzhi jiao Laboratoire d’Océanographie de Villefranche CNRS-Sorbonne University-IddriParis75006France Carbon Neutral Innovation Reaserch Center Xiamen UniversityXiamen361005China

Ocean acidification,deoxygenation and sea level Rise impacted by global warming intertwined with anthropogenic activities have resulted in tremendous ecological losses at species,diversity and ecosystem levels,leading... 详细信息

关键词： warming climate consequences

Microbial sulfurization stimulates carbon sequestration in marine oxygen minimum zones

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Science Bulletin 2022年第9期67卷 895-898,M0003页

作者： Quanrui Chen Kai Tang Xiaofeng Chen nianzhi jiao State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361005China Basic Science Center on Marine Carbon Sequestration and Biogeochemistry Xiamen UniversityXiamen 361005China

The organosulfur cycle gradually changed with the history of oxygen on Earth,and it affected the evolution of living *** one of the most ancient pathways,assimilatory sulfate reduction for sulfur amino acid synthesis could have provided up to 75% of the reduced sulfur needed for life processes in the paleoseawater environment,which was characterized by very low sulfate *** reduction of sulfate to hydrogen sulfide appeared to prevail globally until the start of ocean oxygenation around 2.7 billion years ago[1],supporting a substantial portion of sedimentary sulfur pools and associated carbon mineralization.

关键词： sulfur globally 硫化作用

Tapping Carbon Sequestration Potential of Blooming Macroalgae to Mitigate Climate Change

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Ocean-Land-Atmosphere Research 2023年第1期2卷 359-363页

作者： Yongyu Zhang Dong Liu nianzhi jiao Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China Innovative Research Center for Carbon Neutralization Global ONCE ProgramXiamen UniversityXiamen 361005China Shandong Energy Institute Qingdao 266101China Qingdao New Energy Shandong Laboratory Qingdao 266101China Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China.

Macroalgal mariculture is gaining global attention to achieve carbon neutrality due to its important contribution to ocean carbon ***,some wild macroalgal species(e.g.,Sargassum and Ulva prolifera)exhibit strong environmental adaptability and can cause large-scale,recurrent blooms in global oceans,fueled by rising atmospheric CO_(2) levels and coastal ***,massive Ulva prolifera green tides have occurred annually in the Yellow Sea for the past 17 consecutive *** the late blooming stage,millions of tons of *** naturally sink to the shallow *** subsequent intense microbial aerobic degradation of sinking macroalgae results in coastal hypoxia and acidification,with most of the macroalgal carbon returning to the *** or reducing the intense degradation of massive sinking *** could enable more macroalgal carbon storage in the ocean in the long term and alleviate the harmful effects of green ***,ecological disasters from macroalgal blooms may be transformed into useful natural platforms to increase ocean carbon *** propose an integrated strategy using environmentally friendly minerals(e.g.,montmorillonite and calcium carbonate)and coagulants(e.g.,polyaluminum chloride),along with natural algicidal bacteria or substances,to induce rapid flocculation and sedimentation of blooming macroalgae,reduce the degradation of sinking macroalgae and its negative environmental impacts,and minimize the generation of macroalgal propagules or seeds and the potential risk for future green tide *** integrated approach is potentially a promising approach to tap the carbon sequestration potential of macroalgal blooms to mitigate climate change.

关键词： ocean coastal massive

Molecular characterization of organic matter transformation mediated by microorganisms under anoxic/hypoxic conditions

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Science China Earth Sciences 2023年第4期66卷 894-909页

作者： Shicong XIAO Jiaxin CHEN Yuan SHEN Qi CHEN Yu WANG Yunyun LI Chen HE Ruanhong CAI Quan SHI nianzhi jiao Qiang ZHENG State Key Laboratory for Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Fujian Key Laboratory of Marine Carbon Sequestration Xiamen 361102China College of Environment and Ecology Xiamen UniversityXiamen 361102China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China

Dissolved organic matter(DOM) in the ocean is one of the largest carbon pools on Earth. Microbial metabolism is an important process that shapes the marine DOM pool. Current studies on the interactions between microorganisms and DOM focus mainly on oxic environments. Few studies have addressed the molecular characteristics of DOM in microbial-mediated transformation under anoxic/hypoxic conditions. As a result of deteriorating water quality due to eutrophication and global warming, anoxia occurs frequently in coastal waters. In this study, we performed an experiment to investigate changes in microbial community responses and the molecular characteristics of DOM in microbial-mediated transformation under hypoxic conditions. We compared microbial-mediated DOM transformation at different dissolved oxygen levels(7, 5, and 2 mg L^(-1)) and in different media(natural and artificial seawater with and without laminarin). We also investigated differences in DOM composition between groups using spectroscopic analysis and ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry. The results showed decreased microbial metabolic activity and delayed community succession at low oxygen(≤2 mg L^(-1)) in natural seawater supplemented with laminarin. The growth of strictly aerobic bacteria such as Pseudomonadaceae and Sphingomonadaceae was inhibited and the total organic carbon utilization rate was reduced by 36.9–46.7% from 4 to 32days. Moreover, tyrosine-like and tryptophan-like components were preserved, while DOM humification and modified aromaticity indices were significantly reduced under low oxygen conditions. This experiment provides justification for further study of the processes and mechanisms of improved labile DOM preservation in anoxic estuarine and coastal waters.

关键词： Anoxic/hypoxic Microbial community structure Dissolved organic matter Chemical characteristics of molecule