The bacterial diversity and community composition altered in the oxygen minimum zone of the Tropical Western Pacific Ocean
The bacterial diversity and community composition altered in the oxygen minimum zone of the Tropical Western Pacific Ocean
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热带西太平洋最低氧区细菌多样性和群落组成的变化
DOI：
10.1007/s00343-021-0370-0
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发表时间：
2021-07
影响因子：
1.6
通讯作者：
Wang Qidong
中科院分区：
文献类型：
--
作者：
Sun Qiqi;Song Jinming;Li Xuegang;Yuan Huamao;Wang Qidong
全球最低氧区（OMZ）正在扩大，但与溶解氧水平相关的微生物群落变化格局仍不清楚。2019年5月，对热带西太平洋（TWPO）海山区水柱内6个站点的细菌多样性和群落组成（以16S rRNA为代表）的空间变异进行了研究。海水溶解氧（DO）浓度为3.01-6.68 mg/L，是最低氧区的核心深度位于650 m~1 750 m之间。细菌α多样性呈单峰分布,DO随着深度的增加而减小,并在OMZ上眼斜层(UO)处达到峰值。混合层(ML)和底层的细菌群落结构相互聚集、分离,而UO和OMZ核心(OM)的细菌群落结构则聚集和重叠。总体上,细菌群落组成由ML中以αproteobacteria和gammaproteobacteria为主，UO和OM中以Gammaproteobacteria和Nitrososphaeria/Deltaproteobacteria为主，底层则改为梭状芽胞杆菌和unidentified_Actinobacteria为主。此外，细菌的α多样性和丰富的类群都与DO不同的切片功能相吻合。DO仅解释了40.37%层间细菌群落组成的变化（P <0.001）。预测的功能分析表明，ML中水柱以化能异养、蓝细菌和光合自养为主，UO和OM中以化能异养和硝酸盐/硫化物循环为主，底层以化能异养和发酵为主。我们的研究结果揭示了与DO相关的细菌多样性和群落组成的变化，并有助于阐明潜在的潜力。微生物及其所涉及的生物地球化学过程对 OMZ 扩张和强化的反应。
The oxygen minimum zones(OMZs) are globally expanding,yet the variation pattern of microbial communities related to dissolved oxygen levels remain unclear.Spatial variability of bacterial diversity and community composition(represented by 16S rRNA) of six stations was investigated within the water column in the seamount area of Tropical Western Pacific Ocean(TWPO) in May 2019.The 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 1 750 m.The bacterial alpha-diversity showed unimodal pattern with the decreasing DO with depths and peaked in the upper oxycline(UO) of OMZs.The 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 overlapped.Overall,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 layer.Moreover,both bacterial alpha-diversity and the abundant classes fitted varying sectioned functions with DO.The DO solely explained 40.37% of the variation of bacterial community composition among layers(P <0.001).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 fermentation in the bottom layer.Our 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.
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微生物生态学
DOI：
10.1007/978-981-16-3353-9_1
发表时间：
2021
期刊：
Actinobacteria
影响因子：
--
作者：
M. Kontro;Jayachandra S. Yaradoddi
通讯作者：
Jayachandra S. Yaradoddi
影响因子：
16.6
作者：
Beman, J. Michael;Carolan, Molly T.
通讯作者：
Carolan, Molly T.
影响因子：
5.8
作者：
Qiqi Sun;Jinming Song;Xuegang Li;Huamao Yuan;Jun Ma;Qidong Wang
通讯作者：
Qiqi Sun;Jinming Song;Xuegang Li;Huamao Yuan;Jun Ma;Qidong Wang
影响因子：
1.4
作者：
Rissanen, Antti J.;Saarenheimo, Jatta;Nykanen, Hannu
通讯作者：
Nykanen, Hannu
影响因子：
3.7
作者：
Spietz RL;Williams CM;Rocap G;Horner-Devine MC
通讯作者：
Horner-Devine MC