The bacterial diversity and community composition altered in the oxygen minimum zone of the Tropical Western Pacific Ocean

作     者：Qiqi SUN Jinming SONG Xuegang LI Huamao YUAN Qidong WANG Qiqi SUN;Jinming SONG;Xuegang LI;Huamao YUAN;Qidong WANG

作者机构：Shandong Peanut Research InstituteQingdao 266100China Key Laboratory of Marine Ecology and Environmental SciencesInstitute ofOceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental SciencePilot NationalLaboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of SciencesBeijing 100049China Center for Ocean Mega-ScienceChinese Academy of SciencesQingdao266071China 

出 版 物：《Journal of Oceanology and Limnology》 (海洋湖沼学报（英文）)

年 卷 期：2021年第39卷第5期

页      面：1690-1704页

核心收录：

学科分类：0710[理学-生物学] 1007[医学-药学(可授医学、理学学位)] 100705[医学-微生物与生化药学] 07[理学] 071005[理学-微生物学] 10[医学] 

基　　金：the National Natural Science Foundation of China(No.91958103) the Science&Technology Basic Resources Investigation Program of China(No.2017FY100802) the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA19060401) 

主　　题：bacterial diversity community composition oxygen minimum zones(OMZs) dissolved oxygen Tropical Western Pacific Ocean(TWPO) 

摘      要：The oxygen minimum zones(OMZs)are globally expanding,yet the variation pattern of microbial communities related to dissolved oxygen levels remain *** variability of bacterial diversity and community composition(repre sented by 16 S rRNA)of six stations was investigated within the water column in the seamount area of Tropical Western Pacific Ocean(TWPO)in May *** seawater has dissolved oxygen(DO)concentration of 3.01-6.68 mg/L and the core of the oxygen minimum zones was located between the depths of 650 m and 1750 *** bacterial alpha-diversity showed unimodal pattern with the decreasing DO with depths and peaked in the upper oxycline(UO)of *** bacterial community structure of the mixed layer(ML)and the bottom layer clustered and separated from each other,while those of UO and the OMZ core(OM)clustered and ***,bacterial community composition transitioned from being Alphaproteobacteria and Gammaproteobacteria-dominant in ML to being Gammaproteobacteria and Nitrososphaeria/Deltaproteobacteria-dominant in UO and OM,and then changed to being Clostridia and unidentified Actinobacteria-dominant in the bottom ***,both bacterial alpha-diversity and the abundant classes fitted varying sectioned functions with *** DO solely explained 40.37%of the variation of bacterial community composition among layers(P0.001).The predicted function profiling showed that the water column was predominant by chemoheterotrophy,cyanobacteria,and photoautotrophy in ML,by chemoheterotrophy and nitrate/sulfide cycling in UO and OM,and by chemoheterotrophy and ferme ntation in the bottom *** findings revealed the DO-associated variation in bacterial diversity and community composition,and help to clarify the potential responses of microbes and their involved biogeochemical processes to the expansion and intensification of OMZs.