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Comammox and AOA Responses to Ammonia Loading Rate in Oligotrophic Environments
Water Research ( IF 11.4 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.watres.2025.123191
Run Su, Litong Shi, Yan Wei, Bin Ma
Water Research ( IF 11.4 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.watres.2025.123191
Run Su, Litong Shi, Yan Wei, Bin Ma
Nitrification is a central process in the global nitrogen cycle, yet the ecological niches and growth strategies of ammonia-oxidizing microorganisms in oligotrophic environments remain poorly understood. To investigate the ecological responses of complete ammonia oxidizers (Comammox) and ammonia-oxidizing archaea (AOA), a membrane bioreactor (MBR) system with two distinct ammonia loading rates (ALRs) was employed in this study. Metagenomic and meta-transcriptomic analyses showed that Comammox species—including Candidatus Nitrospira nitrosa and Candidatus Nitrospira inopinata—underwent a pronounced “bloom” only at high ALR, where their DNA and mRNA relative abundances reached 4.7% and 5.63%, respectively. Meanwhile, AOA steadily increased under both high and low ALR in oligotrophic environments. Network analysis further indicated stronger cooperative interactions between Comammox and AOA in higher ALR, highlighting distinct ecological strategies that underpin ammonia oxidation in oligotrophic environments. These findings not only support the development of low-carbon nitrogen removal processes in wastewater treatment but also clarify the impact of nitrogen loading on the distribution of ammonia-oxidizing microorganisms in natural ecosystems and provide insights into the origin and evolutionary pathways of these essential microbes.
中文翻译:
Comammox 和 AOA 对贫营养环境中氨负荷率的响应
硝化作用是全球氮循环的核心过程,但人们对寡营养环境中氨氧化微生物的生态位和生长策略仍然知之甚少。为了研究完全氨氧化器 (Comammox) 和氨氧化古细菌 (AOA) 的生态响应,本研究采用了具有两种不同氨负荷率 (ALR) 的膜生物反应器 (MBR) 系统。宏基因组学和宏转录组学分析表明,Comammox 物种(包括 Candidatus Nitrospira nitrosa 和 Candidatus Nitrospira inopinata)仅在高 ALR 下经历明显的“水华”,它们的 DNA 和 mRNA 相对丰度分别达到 4.7% 和 5.63%。同时,在寡营养环境中,AOA 在高和低 ALR 下稳步增加。网络分析进一步表明,在较高的 ALR 下,Comammox 和 AOA 之间的合作相互作用更强,突出了在寡营养环境中支持氨氧化的不同生态策略。这些发现不仅支持废水处理中低碳脱氮工艺的开发,还阐明了氮负荷对自然生态系统中氨氧化微生物分布的影响,并为这些必需微生物的起源和进化途径提供了见解。
更新日期:2025-01-27
中文翻译:
Comammox 和 AOA 对贫营养环境中氨负荷率的响应
硝化作用是全球氮循环的核心过程,但人们对寡营养环境中氨氧化微生物的生态位和生长策略仍然知之甚少。为了研究完全氨氧化器 (Comammox) 和氨氧化古细菌 (AOA) 的生态响应,本研究采用了具有两种不同氨负荷率 (ALR) 的膜生物反应器 (MBR) 系统。宏基因组学和宏转录组学分析表明,Comammox 物种(包括 Candidatus Nitrospira nitrosa 和 Candidatus Nitrospira inopinata)仅在高 ALR 下经历明显的“水华”,它们的 DNA 和 mRNA 相对丰度分别达到 4.7% 和 5.63%。同时,在寡营养环境中,AOA 在高和低 ALR 下稳步增加。网络分析进一步表明,在较高的 ALR 下,Comammox 和 AOA 之间的合作相互作用更强,突出了在寡营养环境中支持氨氧化的不同生态策略。这些发现不仅支持废水处理中低碳脱氮工艺的开发,还阐明了氮负荷对自然生态系统中氨氧化微生物分布的影响,并为这些必需微生物的起源和进化途径提供了见解。