Dissolved oxygen disturbs nitrate transformation by modifying microbial community, co-occurrence networks, and functional genes during aerobic-anoxic transition

No consensus has been achieved among researchers on the effect of dissolved oxygen (DO) on nitrate (NO3−-N) transformation and the microbial community, especially during aerobic-anoxic transition. To supplement this knowledge, NO3−-N transformation, microbial communities, co-occurrence networks, and...

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Veröffentlicht in:The Science of the total environment 2021-10, Vol.790, p.148245-148245, Article 148245
Hauptverfasser: Liu, Xiaoyan, Hu, Sihai, Sun, Ran, Wu, Yaoguo, Qiao, Zixia, Wang, Sichang, Zhang, Zehong, Cui, Chuwen
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container_title The Science of the total environment
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Hu, Sihai
Sun, Ran
Wu, Yaoguo
Qiao, Zixia
Wang, Sichang
Zhang, Zehong
Cui, Chuwen
description No consensus has been achieved among researchers on the effect of dissolved oxygen (DO) on nitrate (NO3−-N) transformation and the microbial community, especially during aerobic-anoxic transition. To supplement this knowledge, NO3−-N transformation, microbial communities, co-occurrence networks, and functional genes were investigated during aerobic-anoxic transition via microcosm simulation. NO3−-N transformation rate in the early stage (DO ≥2 mg/L) was always significantly higher than that in the later stage (DO
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To supplement this knowledge, NO3−-N transformation, microbial communities, co-occurrence networks, and functional genes were investigated during aerobic-anoxic transition via microcosm simulation. NO3−-N transformation rate in the early stage (DO ≥2 mg/L) was always significantly higher than that in the later stage (DO &lt;2 mg/L) during aerobic-anoxic transition, and NO2−-N accumulation was more significant during the anoxic stage, consistent with the result obtained under constant DO conditions. These NO3−-N transformation characteristics were not affected by other environmental factors, indicating the important role of DO in NO3−-N transformation during aerobic-anoxic transition. Changes in DO provoked significant alterations in microbial diversity and abundance of functional bacteria dominated by Massilia, Bacillus, and Pseudomonas, leading to the variation in NO3−-N transformation. Co-occurrence network analysis revealed that NO3−-N transformation was performed by the interactions between functional bacteria including symbiotic and competitive relationship. In the presence of oxygen, these interactions accelerated the NO3−-N transformation rate, and bacterial metabolization proceeded via increasingly varied pathways including aerobic and anoxic respiration, which was demonstrated through predicted genes. The higher relative abundance of genes narG, narH, and napA suggested the occurrence of coupled aerobic-anoxic denitrification in the early stage. NO3−-N transformation rate decreased accompanied by a significant NO2−-N accumulation with the weakening of coupled aerobic-anoxic denitrification during aerobic-anoxic transition. Structural equation modeling further demonstrated the relationship between DO and NO3−-N transformation. DO affects NO3−-N transformation by modifying microbial community, bacterial co-occurrence, and functional genes during aerobic-anoxic transition. [Display omitted] •NO3−-N transformation rates decreased during aerobic-anoxic transition.•DO aroused significant changes in microbial diversity and community.•Coupling aerobic-anoxic denitrification can promote NO3−-N transformation.•DO indirectly affected NO3−-N transformation by modifying microbial function.</description><identifier>ISSN: 0048-9697</identifier><identifier>EISSN: 1879-1026</identifier><identifier>DOI: 10.1016/j.scitotenv.2021.148245</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Aerobic-anoxic transition ; Co-occurrence network ; Dissolved oxygen ; Microbial communities ; Nitrate transformation</subject><ispartof>The Science of the total environment, 2021-10, Vol.790, p.148245-148245, Article 148245</ispartof><rights>2021 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c348t-dec0c81ddf3bdb791299110791a04647d4117de76798fab94be19a8c432f209b3</citedby><cites>FETCH-LOGICAL-c348t-dec0c81ddf3bdb791299110791a04647d4117de76798fab94be19a8c432f209b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0048969721033167$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Liu, Xiaoyan</creatorcontrib><creatorcontrib>Hu, Sihai</creatorcontrib><creatorcontrib>Sun, Ran</creatorcontrib><creatorcontrib>Wu, Yaoguo</creatorcontrib><creatorcontrib>Qiao, Zixia</creatorcontrib><creatorcontrib>Wang, Sichang</creatorcontrib><creatorcontrib>Zhang, Zehong</creatorcontrib><creatorcontrib>Cui, Chuwen</creatorcontrib><title>Dissolved oxygen disturbs nitrate transformation by modifying microbial community, co-occurrence networks, and functional genes during aerobic-anoxic transition</title><title>The Science of the total environment</title><description>No consensus has been achieved among researchers on the effect of dissolved oxygen (DO) on nitrate (NO3−-N) transformation and the microbial community, especially during aerobic-anoxic transition. To supplement this knowledge, NO3−-N transformation, microbial communities, co-occurrence networks, and functional genes were investigated during aerobic-anoxic transition via microcosm simulation. NO3−-N transformation rate in the early stage (DO ≥2 mg/L) was always significantly higher than that in the later stage (DO &lt;2 mg/L) during aerobic-anoxic transition, and NO2−-N accumulation was more significant during the anoxic stage, consistent with the result obtained under constant DO conditions. These NO3−-N transformation characteristics were not affected by other environmental factors, indicating the important role of DO in NO3−-N transformation during aerobic-anoxic transition. Changes in DO provoked significant alterations in microbial diversity and abundance of functional bacteria dominated by Massilia, Bacillus, and Pseudomonas, leading to the variation in NO3−-N transformation. Co-occurrence network analysis revealed that NO3−-N transformation was performed by the interactions between functional bacteria including symbiotic and competitive relationship. In the presence of oxygen, these interactions accelerated the NO3−-N transformation rate, and bacterial metabolization proceeded via increasingly varied pathways including aerobic and anoxic respiration, which was demonstrated through predicted genes. The higher relative abundance of genes narG, narH, and napA suggested the occurrence of coupled aerobic-anoxic denitrification in the early stage. NO3−-N transformation rate decreased accompanied by a significant NO2−-N accumulation with the weakening of coupled aerobic-anoxic denitrification during aerobic-anoxic transition. Structural equation modeling further demonstrated the relationship between DO and NO3−-N transformation. DO affects NO3−-N transformation by modifying microbial community, bacterial co-occurrence, and functional genes during aerobic-anoxic transition. [Display omitted] •NO3−-N transformation rates decreased during aerobic-anoxic transition.•DO aroused significant changes in microbial diversity and community.•Coupling aerobic-anoxic denitrification can promote NO3−-N transformation.•DO indirectly affected NO3−-N transformation by modifying microbial function.</description><subject>Aerobic-anoxic transition</subject><subject>Co-occurrence network</subject><subject>Dissolved oxygen</subject><subject>Microbial communities</subject><subject>Nitrate transformation</subject><issn>0048-9697</issn><issn>1879-1026</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqFkc1u3SAQhVGVSr1J-wxlmUV8A5gYWEb5aSNF6qZdIwzjiFsbEsA38dv0UYvlqNuyGGZxzjeaOQh9pWRPCe0uD_tsfYkFwnHPCKN7yiXjVx_QjkqhGkpYd4J2hHDZqE6JT-g05wOpT0i6Q39ufc5xPILD8W15goCdz2VOfcbBl2QK4FpDHmKaTPEx4H7BU3R-WHx4wpO3KfbejNjGaZqrZbmobROtnVOCYAEHKK8x_c4X2ASHhznYFVMddRhk7Oa0ggysHNuYEN-83Wb6VfgZfRzMmOHL-3-Gft3f_bz53jz--PZwc_3Y2JbL0jiwxErq3ND2rheKMqUoJbUxhHdcOE6pcCA6oeRgesV7oMpIy1s2MKL69gydb9znFF9myEVPPlsYRxMgzlmzq47IllVslYpNWnfPOcGgn5OfTFo0JXrNRB_0v0z0moneMqnO680JdZOjh7Tq1is5n8AW7aL_L-Mv-5GfgQ</recordid><startdate>20211010</startdate><enddate>20211010</enddate><creator>Liu, Xiaoyan</creator><creator>Hu, Sihai</creator><creator>Sun, Ran</creator><creator>Wu, Yaoguo</creator><creator>Qiao, Zixia</creator><creator>Wang, Sichang</creator><creator>Zhang, Zehong</creator><creator>Cui, Chuwen</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20211010</creationdate><title>Dissolved oxygen disturbs nitrate transformation by modifying microbial community, co-occurrence networks, and functional genes during aerobic-anoxic transition</title><author>Liu, Xiaoyan ; Hu, Sihai ; Sun, Ran ; Wu, Yaoguo ; Qiao, Zixia ; Wang, Sichang ; Zhang, Zehong ; Cui, Chuwen</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c348t-dec0c81ddf3bdb791299110791a04647d4117de76798fab94be19a8c432f209b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Aerobic-anoxic transition</topic><topic>Co-occurrence network</topic><topic>Dissolved oxygen</topic><topic>Microbial communities</topic><topic>Nitrate transformation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Liu, Xiaoyan</creatorcontrib><creatorcontrib>Hu, Sihai</creatorcontrib><creatorcontrib>Sun, Ran</creatorcontrib><creatorcontrib>Wu, Yaoguo</creatorcontrib><creatorcontrib>Qiao, Zixia</creatorcontrib><creatorcontrib>Wang, Sichang</creatorcontrib><creatorcontrib>Zhang, Zehong</creatorcontrib><creatorcontrib>Cui, Chuwen</creatorcontrib><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>The Science of the total environment</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Liu, Xiaoyan</au><au>Hu, Sihai</au><au>Sun, Ran</au><au>Wu, Yaoguo</au><au>Qiao, Zixia</au><au>Wang, Sichang</au><au>Zhang, Zehong</au><au>Cui, Chuwen</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dissolved oxygen disturbs nitrate transformation by modifying microbial community, co-occurrence networks, and functional genes during aerobic-anoxic transition</atitle><jtitle>The Science of the total environment</jtitle><date>2021-10-10</date><risdate>2021</risdate><volume>790</volume><spage>148245</spage><epage>148245</epage><pages>148245-148245</pages><artnum>148245</artnum><issn>0048-9697</issn><eissn>1879-1026</eissn><abstract>No consensus has been achieved among researchers on the effect of dissolved oxygen (DO) on nitrate (NO3−-N) transformation and the microbial community, especially during aerobic-anoxic transition. To supplement this knowledge, NO3−-N transformation, microbial communities, co-occurrence networks, and functional genes were investigated during aerobic-anoxic transition via microcosm simulation. NO3−-N transformation rate in the early stage (DO ≥2 mg/L) was always significantly higher than that in the later stage (DO &lt;2 mg/L) during aerobic-anoxic transition, and NO2−-N accumulation was more significant during the anoxic stage, consistent with the result obtained under constant DO conditions. These NO3−-N transformation characteristics were not affected by other environmental factors, indicating the important role of DO in NO3−-N transformation during aerobic-anoxic transition. Changes in DO provoked significant alterations in microbial diversity and abundance of functional bacteria dominated by Massilia, Bacillus, and Pseudomonas, leading to the variation in NO3−-N transformation. Co-occurrence network analysis revealed that NO3−-N transformation was performed by the interactions between functional bacteria including symbiotic and competitive relationship. In the presence of oxygen, these interactions accelerated the NO3−-N transformation rate, and bacterial metabolization proceeded via increasingly varied pathways including aerobic and anoxic respiration, which was demonstrated through predicted genes. The higher relative abundance of genes narG, narH, and napA suggested the occurrence of coupled aerobic-anoxic denitrification in the early stage. NO3−-N transformation rate decreased accompanied by a significant NO2−-N accumulation with the weakening of coupled aerobic-anoxic denitrification during aerobic-anoxic transition. Structural equation modeling further demonstrated the relationship between DO and NO3−-N transformation. DO affects NO3−-N transformation by modifying microbial community, bacterial co-occurrence, and functional genes during aerobic-anoxic transition. [Display omitted] •NO3−-N transformation rates decreased during aerobic-anoxic transition.•DO aroused significant changes in microbial diversity and community.•Coupling aerobic-anoxic denitrification can promote NO3−-N transformation.•DO indirectly affected NO3−-N transformation by modifying microbial function.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.scitotenv.2021.148245</doi><tpages>1</tpages></addata></record>
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subjects Aerobic-anoxic transition
Co-occurrence network
Dissolved oxygen
Microbial communities
Nitrate transformation
title Dissolved oxygen disturbs nitrate transformation by modifying microbial community, co-occurrence networks, and functional genes during aerobic-anoxic transition
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