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	Aerobic methanotrophs in an urban water cycle system: Community structure and network interaction pattern
	Lu, Lunhui1; Li, Xinrui2; Li, Zhe1; Chen, Yao2; Garcia, Carmen A. Sabio Y.3,4; Yang, Jixiang1; Luo, Fang1,2; Zou, Xi5
	2021-06-10
摘要	Aerobic methane-oxidizing bacteria (MOB) play an important role in reducing methane emissions in nature. Most current researches focus on the natural habitats (e.g., lakes, reservoirs, wetlands, paddy fields, etc.). However, methanotrophs and the methane-oxidizing process remain essentially unclear in artificial habitat, such as the urban water cycle systems. Here, high-throughput sequencing and qPCR were used to analyze the community structure and abundance of MOB. Six different systems were selected from Yunyang City, Chongqing, China, including the raw water system (RW), the water supply pipe network system (SP), the wastewater pipe network system (WP), the hospital wastewater treatment system (HP), the municipal wastewater treatment plant system (WT) and the downstream river system (ST) of a wastewater treatment plant. Results clearly showed that the MOB community structure and network interaction patterns of the urban water cycle system were different from those of natural water bodies. Type I MOB was the dominant Glade in HP. Methylocysis in Type II was the most abundant genus among the whole urban water cycle system, indicating that this genus had a high adaptability to the environment Temperature, dissolved oxygen, pH and concentration significantly affected the MOB communities in the urban water cycle system. The network of MOB in WT was the most complicated, and there were competitive relationships among species in WP. The structure of the network in HP was unstable, and therefore, it was vulnerable to environmental disturbances. Methylocystis (Type II) and Methylomonas (Type I) were the most important keystone species in the entire urban water cycle system. Overall, these findings broaden the understanding of the distribution and interaction patterns of MOB communities in an urban water cycle system and provide valuable clues for ecosystem restoration and environmental management. (C) 2021 Elsevier B.V. All rights reserved.
关键词	Aerobic methane-oxidizing bacteria (MOB) Methane An urban water cycle system Community structure Network interaction patterns
DOI	10.1016/j.scitotenv.2021.145045
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
卷号	772页码:11
通讯作者	Li, Zhe(lizhe@cigit.ac.cn)
收录类别	SCI
WOS记录号	WOS:000628753700058
语种	英语