A unique subseafloor microbiosphere in the Mariana Trench driven by episodic sedimentation

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外文摘要：Hadal trenches are characterized by enhanced and infrequent high-rate episodic sedimentation events that likely introduce not only labile organic carbon and key nutrients but also new microbes that significantly alter the subseafloor microbiosphere.Currently,the role of high-rate episodic sedimentation in controlling the composition of the hadal subseafloor microbio-sphere is unknown.Here,analyses of carbon isotope composition in a～750 cm long sediment core from the Challenger Deep revealed noncontinuous deposition,with anomalous 14C ages likely caused by seismically driven mass transport and the funneling effect of trench geomorphology.Microbial community composition and diverse enzyme activities in the upper～27 cm differed from those at lower depths,probably due to sudden sediment deposition and differences in redox condition and organic matter availability.At lower depths,microbial population numbers,and composition remained rela-tively constant,except at some discrete depths with altered enzyme activity and microbial phyla abundance,possibly due to additional sudden sedimentation events of different magnitude.Evidence is provided of a unique role for high-rate episodic sedimentation events in controlling the subsurface microbiosphere in Earth's deepest ocean floor and highlight the need to perform thorough analysis over a large depth range to characterize hadal benthic populations.Such depositional processes are likely crucial in shaping deep-water geochemical environments and thereby the deep subseafloor biosphere.

外文关键词：

Hadal subseafloorDeep water sedimentMariana TrenchRadiocarbonMicrobial communityRedox potential

作者：

Jiwen Liu、Da-Wei Li、Xinxin He、Ronghua Liu、Haojin Cheng、Chenglong Su、Mengna Chen、Yonghong Wang、Zhongsheng Zhao、Hanyue Xu、Zhangyu Cheng、Zicheng Wang、Nikolai Pedentchouk、David J.Lea-Smith、Jonathan D.Todd、Xiaoshou Liu、Meixun Zhao、Xiao-Hua Zhang

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作者单位：

Frontiers Science Center for Deep Ocean Multispheres and Earth System,and College of Marine Life Sciences,Ocean University of China,Qingdao 266003,China

Laboratory for Marine Ecology and Environmental Science,Laoshan Laboratory,Qingdao 266237,China

Institute of Evolution and Marine Biodiversity,Ocean University of China,Qingdao 266003,China

Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China

Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education/College of Marine Geosciences,Ocean University of China,Qingdao 266100,China

Key Laboratory of Physical Oceanography,Ministry of Education/Research Vessel Centre,Ocean University of China,Qingdao 266100,China

School of Environmental Sciences,University of East Anglia,Norwich NR4 7TJ,UK

School of Biological Sciences,University of East Anglia,Norwich NR4 7TJ,UK

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出版年：

2024

DOI：

10.1007/s42995-023-00212-y

海洋生命科学与技术(英文)

ISSN：

年,卷(期)：2024.6(1)