Although the microbial diversity of the Indian Ocean has been extensively investigated,little is known about the community composition of microbes in the Southern Indian Ocean.In the present study,we divided 60 water column samples on the Ninety-East Ridge(NER)into five water masses according to the temperature-salinity curves.We presented,for the first time,a full description of the microbial biodiversity on NER through high-throughput amplicon sequencing approach,including bacteria,archaea,and fungi.We found that bacteria exhibited higher richness and diversity than archaea and fungi across the water masses on NER.More importantly,each water mass on NER featured distinct prokaryotic microbial communities,as indicated by the results of non-metric multidimensional scaling.In contrast,fungi were eurybathic across the water masses.Redundancy analysis results demonstrated that environmental factors might play a pivotal role in the formation and stability of prokaryotic communities in each water mass,especially that of archaea.In addition,indicator species might be used as fingerprints to identify corresponding water masses on NER.These results provide new insights into the vertical distribution,structure,and diversity of microorganisms on NER from the perspective of water mass.

Shujun LI;Zhisong CUI;Mutai BAO;Xiao LUAN;Fei TENG;Shujiang LI;Tengfei XU;Li ZHENG

Frontiers Science Center for Deep Ocean Multispheres and Earth System,Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,and College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;Marine Bioresources and Environment Research Center,First Institute of Oceanography,Ministry of Natural Resources of China,Qingdao 266061,China;Laboratory for Marine Ecology and Environmental Science,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China

海洋湖沼学报（英文版）

[1]Shujun LI;Zhisong CUI;Mutai BAO;Xiao LUAN;Fei TENG;Shujiang LI;Tengfei XU;Li ZHENG-.Contrasting vertical distribution between prokaryotes and fungi in different water masses on the Ninety-East Ridge,Southern Indian Ocean)[J].海洋湖沼学报（英文版）,2022(02):605-619

eurybathic

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