Microbial residence time is a controlling parameter of the taxonomic composition and functional profile of microbial communities
作者： Cresten Mansfeldt , Stefan Achermann , Yujie Men , Jean-Claude Walser , Kris Villez
DOI: 10.1038/S41396-019-0371-6
关键词:
摘要: A remaining challenge within microbial ecology is to understand the determinants of richness and diversity observed in environmental communities. In a range systems, including activated sludge bioreactors, residence time (MRT) has been previously shown shape community composition. However, physiological ecological mechanisms driving this influence have remained unclear. Here, relationship explored by analyzing an system fed with municipal wastewater. Using model designed study based on Monod-growth kinetics, longer MRTs were increase growth parameters that enable persistence, resulting increased modeled community. laboratory experiments, six sequencing batch reactors treating domestic wastewater operated parallel at between 1 15 days. The communities characterized using both 16S ribosomal RNA non-target messenger (metatranscriptomic analysis), model-predicted monotonic increases confirmed profiles. Accordingly, taxonomic Shannon also MRT. contrast, enzyme class annotations from metatranscriptomic analysis displayed non-monotonic trend over MRT gradient. Disproportionately high abundances transcripts encoding for rarer enzymes occur lead disconnect functional
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