期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 17, 页码 11948-11960出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c02486
关键词
biofilm; community assembly; community succession; MBBR; network
资金
- Ministry of Science and Technology of the People's Republic of China [2017YFE0114300]
- National Natural Science Foundation of China [51622813, 51878675]
The study demonstrates that different ecological processes exist at different stages of biofilm development, where interspecific cooperation plays a key role in the initial formation and rapid development of biofilms, while interspecific competition predominantly occurs in the mature stage. These processes are crucial for understanding the linkages between development and function in biofilm-based treatment processes.
In biofilm-based engineered ecosystems, the reactor performance was closely linked to interspecies interactions within a biofilm ecosystem, whereas the ecological processes underpinning such linkage were still unenlightened. Herein, the principles of community succession and assembly were integrated to capture the ecological laws of biofilm development by molecular ecological networks and assembly model analysis based on the 16S rRNA sequencing analysis and metagenomics in a well-controlled moving bed biofilm reactor. At the initial colonization phase (days 0-2, driven by initial colonizers), interspecific cooperation (74.18%) facilitated initial biofilm formation, whereas some pioneers, and keystone species disappeared at later phases. At the accumulation phase (days 3-30, rapid biofilm development), interspecific cooperation (81.41 +/- 5.07%) contributed to rapid biofilm development and keystone species were mainly involved in quorum sensing or positively correlated with extracellular polymeric substance production. At the maturation phase (days 31-106, a well-adapted quasi-equilibrium state), increased interspecific competition (32.74 +/- 4.77%) and higher small-world property facilitated the rapid information transportation and pollutant treatment, and keystone species were positively correlated with the removal of COD and NH4+-N. Homogenizing dispersal diminished the contemporary community dissimilarities, while turnover but rather nestedness governed the temporal variations in the biofilm succession period. This study highlighted the specificity of ecological processes at distinct biofilm development phases, which would advance our understanding on the development-to-function linkages in biofilm-based treatment processes.
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