title: Temperature affects microbial abundance, activity and interactions in anaerobic digestion.
abstract: Temperature is a major factor determining the performance of the anaerobic digestion process. The microbial abundance, activity and interactional networks were investigated under a temperature gradient from 25°C to 55°C through amplicon sequencing, using 16S ribosomal RNA and 16S rRNA gene-based approaches. Comparative analysis of past accumulative elements presented by 16S rRNA gene-based analysis, and the in-situ conditions presented by 16S rRNA-based analysis, provided new insights concerning the identification of microbial functional roles and interactions. The daily methane production and total biogas production increased with temperature up to 50°C, but decreased at 55°C. Increased methanogenesis and hydrolysis at 50°C were main factors causing higher methane production which was also closely related with more well-defined methanogenic and/or related modules with comprehensive interactions and increased functional orderliness referred to more microorganisms participating in interactions. This research demonstrated the importance of evaluating functional roles and interactions of microbial community.
authors.affiliation: Key Laboratory of Environmental and Applied Microbiology, CAS, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Lin
authors.affiliation: Laboratory of Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Gent, Belgium.
authors.forename: Jo
authors.initials: J
authors.lastname: De Vrieze
authors.affiliation: Key Laboratory of Environmental and Applied Microbiology, CAS, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
authors.forename: Jiabao
authors.initials: J
authors.lastname: Li
authors.affiliation: Key Laboratory of Environmental and Applied Microbiology, CAS, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China. Electronic address: lixz@cib.ac.cn.
authors.forename: Xiangzhen
authors.initials: X
authors.lastname: Li
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D019149:Bioreactors; D019605:Euryarchaeota / Q000235:genetics; D005285:Fermentation; D008372:Manure; D008697:Methane / Q000096:biosynthesis*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013696:Temperature; D018505:Waste Management / Q000379:methods
chemical_list: D056804:Biofuels; D008372:Manure; D012336:RNA, Ribosomal, 16S; D008697:Methane
keywords: Anaerobic digestion; Community activity; Functional orderliness; Microbial interactional networks; Temperature gradient