{"title":"Biogeography and impact of nitrous oxide reducers in rivers across a broad environmental gradient on emission rates","authors":"Sibo Zhang, Xinghui Xia, Leilei Yu, Shaoda Liu, Xiaokang Li, Junfeng Wang, Yue Zheng, Lanfang Han, Qian Tan, Zhifeng Yang","doi":"10.1111/1462-2920.16622","DOIUrl":null,"url":null,"abstract":"<p>Microbial communities that reduce nitrous oxide (N<sub>2</sub>O) are divided into two clades, <i>nosZ</i>I and <i>nosZ</i>II. These clades significantly differ in their ecological niches and their implications for N<sub>2</sub>O emissions in terrestrial environments. However, our understanding of N<sub>2</sub>O reducers in aquatic systems is currently limited. This study investigated the relative abundance and diversity of <i>nosZ</i>I- and <i>nosZ</i>II-type N<sub>2</sub>O reducers in rivers and their impact on N<sub>2</sub>O emissions. Our findings revealed that stream sediments possess a high capacity for N<sub>2</sub>O reduction, surpassing N<sub>2</sub>O production under high N<sub>2</sub>O/NO<sub>3</sub>- ratio conditions. This study, along with others in freshwater systems, demonstrated that <i>nosZ</i>I marginally dominates more often in rivers. While microbes containing either <i>nosZ</i>I and <i>nosZ</i>II were crucial in reducing N<sub>2</sub>O emissions, the net contribution of <i>nosZ</i>II-containing microbes was more significant. This can be attributed to the <i>nir</i> gene co-occurring more frequently with the <i>nosZ</i>I gene than with the <i>nosZ</i>II gene. The diversity within each clade also played a role, with <i>nosZ</i>II species being more likely to function as N<sub>2</sub>O sinks in streams with higher N<sub>2</sub>O concentrations. Overall, our findings provide a foundation for a better understanding of the biogeography of stream N<sub>2</sub>O reducers and their effects on N<sub>2</sub>O emissions.</p>","PeriodicalId":11898,"journal":{"name":"Environmental microbiology","volume":"26 5","pages":""},"PeriodicalIF":4.3000,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental microbiology","FirstCategoryId":"99","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/1462-2920.16622","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MICROBIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Microbial communities that reduce nitrous oxide (N2O) are divided into two clades, nosZI and nosZII. These clades significantly differ in their ecological niches and their implications for N2O emissions in terrestrial environments. However, our understanding of N2O reducers in aquatic systems is currently limited. This study investigated the relative abundance and diversity of nosZI- and nosZII-type N2O reducers in rivers and their impact on N2O emissions. Our findings revealed that stream sediments possess a high capacity for N2O reduction, surpassing N2O production under high N2O/NO3- ratio conditions. This study, along with others in freshwater systems, demonstrated that nosZI marginally dominates more often in rivers. While microbes containing either nosZI and nosZII were crucial in reducing N2O emissions, the net contribution of nosZII-containing microbes was more significant. This can be attributed to the nir gene co-occurring more frequently with the nosZI gene than with the nosZII gene. The diversity within each clade also played a role, with nosZII species being more likely to function as N2O sinks in streams with higher N2O concentrations. Overall, our findings provide a foundation for a better understanding of the biogeography of stream N2O reducers and their effects on N2O emissions.
期刊介绍:
Environmental Microbiology provides a high profile vehicle for publication of the most innovative, original and rigorous research in the field. The scope of the Journal encompasses the diversity of current research on microbial processes in the environment, microbial communities, interactions and evolution and includes, but is not limited to, the following:
the structure, activities and communal behaviour of microbial communities
microbial community genetics and evolutionary processes
microbial symbioses, microbial interactions and interactions with plants, animals and abiotic factors
microbes in the tree of life, microbial diversification and evolution
population biology and clonal structure
microbial metabolic and structural diversity
microbial physiology, growth and survival
microbes and surfaces, adhesion and biofouling
responses to environmental signals and stress factors
modelling and theory development
pollution microbiology
extremophiles and life in extreme and unusual little-explored habitats
element cycles and biogeochemical processes, primary and secondary production
microbes in a changing world, microbially-influenced global changes
evolution and diversity of archaeal and bacterial viruses
new technological developments in microbial ecology and evolution, in particular for the study of activities of microbial communities, non-culturable microorganisms and emerging pathogens