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Elevated nitrate simplifies microbial community compositions and interactions in sulfide-rich river sediments.
Li, Enze; Deng, Tongchu; Yan, Lei; Zhou, Jizhong; He, Zhili; Deng, Ye; Xu, Meiying.
Afiliação
  • Li E; Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China; State Key Laboratory of Applied Microbiology Southern China, Guangzhou 510070, China. Electronic address: eli6@hawk.iit.ed
  • Deng T; Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China; State Key Laboratory of Applied Microbiology Southern China, Guangzhou 510070, China. Electronic address: tongchudeng2013@
  • Yan L; Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China; State Key Laboratory of Applied Microbiology Southern China, Guangzhou 510070, China.
  • Zhou J; Institute for Environmental Genomics, University of Oklahoma, Norman, OK 73019, USA. Electronic address: jzhou@ou.edu.
  • He Z; Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China. Electronic address: hezhili@mail.sysu.edu.cn.
  • Deng Y; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: yedeng@rcees.ac.cn.
  • Xu M; Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China; State Key Laboratory of Applied Microbiology Southern China, Guangzhou 510070, China. Electronic address: xumy@gdim.cn.
Sci Total Environ ; 750: 141513, 2021 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-32853935
ABSTRACT
Excessive nitrate in water systems is prevailing and a global risk of human health. Polluted river sediments are dominated by anaerobes and often the hotspot of denitrification. So far, little is known about the ecological effects of nitrate pollution on microbial dynamics, especially those in sulfide-rich sediments. Here we simulated a nitrate surge and monitored the microbial responses, as well as the changes of important environmental parameters in a sulfide-rich river sediment for a month. Our analysis of sediment microbial communities showed that elevated nitrate led to (i) a functional convergence at denitrification and sulfide oxidation, (ii) a taxonomic convergence at Proteobacteria, and (iii) a significant loss of biodiversity, community stability and other functions. Two chemolithotrophic denitrifiers Thiobacillus and Luteimonas were enriched after nitrate amendment, although the original communities were dominated by methanogens and syntrophic bacteria. Also, serial dilutions of sediment microbial communities found that Thiobacillus thiophilus dominated 18/30 communities because of its capability of simultaneous nitrate reduction and sulfide oxidation. Additionally, our network analysis indicated that keystone taxa seemed more likely to be native auxotrophs (e.g., syntrophic bacteria, methanogens) rather than dominant denitrifiers, possibly because of the extensive interspecific cross-feeding they estabilished, while environment perturbations probably disrupted that cross-feeding and simplified microbial interactions. This study advances our understanding of microbial community responses to nitrate pollution and possible mechanism in the sulfide-rich river sediment.
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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Rios / Microbiota Idioma: Inglês Revista: Sci Total Environ Ano de publicação: 2021 Tipo de documento: Artigo

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Rios / Microbiota Idioma: Inglês Revista: Sci Total Environ Ano de publicação: 2021 Tipo de documento: Artigo