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Characterization and diversity of magnetotactic bacteria from sediments of caroline seamount in the Western Pacific Ocean

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Journal of Oceanology and Limnology 2021年第6期39卷 2027-2043页

作者： Kaixuan CUI Wenyan ZHANG Jia LIU Cong XU Yicong ZHAO Si CHEN Hongmiao PAN Tian XIAO Long-Fei WU CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China International Associated Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms(LIA-MagMC) CNRS-CASQingdao 266071China Aix Marseille Univ CNRSLCBIM2BIMMMarseille 13009France National Oceanographic Center Qingdao 266071China

Magnetotactic bacteria(MTB)are a group of microorganisms capable of orientating and swimming along magnetic fields because they contain intracellular biomineralized magnetosomes composed of magnetite(Fe 3 O 4)or/and greigite(Fe_(3)S_(4)).They are ubiquitous in freshwater,brackish,and marine habitats,and are cosmopolitan in ***,knowledge of their occurrence and distribution in seamount ecosystems is *** investigated the diversity and distribution of MTB in the caroline seamount(CM4).The abundance of living MTB in 12 stations in depth varying from 90 to 1545 m was 1.1×10^(3)-43.7×10^(3) inds./dm *** diverse shapes of MTB observed,magnetotactic cocci were the dominant morphotype and could be categorized into two types:1)typical cocci that appeared to have peritrichous fl agella;and 2)those characterized by having a drop-shaped form and one bundle of fl agella located at the thin/narrow end of the *** electron microscopy(TEM)analysis revealed that the magnetosomes formed by those magnetotactic cocci are magnetite(Fe 3 O 4)with octahedral crystal habit.A total of 41 operational taxonomic units(OTUs)of putative MTB(2702 reads)were acquired from nine stations,based on high-throughput *** these,40 OTUs belonged to the Proteobacteria phylum and one belonged to the Nitrospirae *** found apparent connectivity between the MTB populations on the caroline and Kexue(Science in Chinese)seamounts,although the diversity of MTB on caroline was much richer than on the Kexue *** results imply that the unique topography of seamounts and other as-yet unclear environmental factors could lead to evolution of different fl agella arrangements in magnetotactic cocci,and the occurrence of octahedral magnetite magnetosomes.

关键词： magnetotactic bacteria caroline seamount abundance diversity magnetosome

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Physical oceanography of the caroline M4 seamount in the tropical Western Pacific Ocean in summer 2017

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Journal of Oceanology and Limnology 2021年第5期39卷 1634-1650页

作者： Xingyu SHI Zhenyan WANG Haijun HUANG CAS Key Laboratory of Marine Geology and Environment Institute ofOceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Pilot National Laboratory forMarine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao266071China

Physical oceanography plays an important role in the formation of submarine sediments,and the distribution of nutriments and biocenoses in *** M4 seamount is located in the caroline Island Ridge of the Western Pacific *** physical properties around M4 seamount are preliminarily analyzed based on the in-situ data obtained in summer 2017 in caroline M4 seamount and open-sourced *** found that the water in the upper 200 m is controlled by the westward North Equatorial Current(NEC),while the water between 300-1000 m is dominated by the eastward North Equatorial Undercurrent(NEUC).The current direction fluctuates significantly below 300 m at upstream *** the same depth of the lee sides,the current direction changes with the distance from *** are likely caused by the obstacle of M4 *** calculation results show that there is an anticyclonic cap above M4 seamount caused by tidal *** currents in M4 seamount are squeezed by the topography and amplified,and the amplified tidal currents play a dominant role in M4 ***,the circulation system generated by the interaction of the amplified tidal current and M4 seamount drives the upward/downward movement of the ***,the thickness of the surface turbulent layer is changed with the tidal ***,high turbulent diffusivities are found in the bottom of M4 seamount,and these are most likely attributed to the turbulent mixing induced by the mutual effect between semidiurnal tidal currents and steep *** article of physical oceanography provides scientific basis for further analysis of the distribution of biological community and deposition mechanism in M4 seamount.

关键词： caroline seamount tropical Western Pacific Ocean currents water masses tides turbulent diffusivities

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