Microbial residence time is a controlling parameter of the taxonomic composition and functional profile of microbial communities.

The ISME Journal
Cresten MansfeldtKathrin Fenner

Abstract

A remaining challenge within microbial ecology is to understand the determinants of richness and diversity observed in environmental microbial communities. In a range of systems, including activated sludge bioreactors, the microbial residence time (MRT) has been previously shown to shape the microbial community composition. However, the physiological and ecological mechanisms driving this influence have remained unclear. Here, this relationship is explored by analyzing an activated sludge system fed with municipal wastewater. Using a model designed in this study based on Monod-growth kinetics, longer MRTs were shown to increase the range of growth parameters that enable persistence, resulting in increased richness and diversity in the modeled community. In laboratory experiments, six sequencing batch reactors treating domestic wastewater were operated in parallel at MRTs between 1 and 15 days. The communities were characterized using both 16S ribosomal RNA and non-target messenger RNA sequencing (metatranscriptomic analysis), and model-predicted monotonic increases in richness were confirmed in both profiles. Accordingly, taxonomic Shannon diversity also increased with MRT. In contrast, the diversity in enzyme class annotations...Continue Reading

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Citations

Aug 8, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Chunying LiChein-Chi Chang
Jan 11, 2020·Frontiers in Microbiology·Fernando BaqueroVal F Lanza
Nov 28, 2019·Environmental Science & Technology·Stefan AchermannKathrin Fenner
Jan 20, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Paula C FureyDaniel L Clemans
Oct 27, 2020·Environmental Science & Technology·Claudia CollAnna Sobek
Sep 7, 2021·Global Change Biology·Liyuan He, Xiaofeng Xu

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Datasets Mentioned

BETA
PRJEB22087

Methods Mentioned

BETA
RNAseq
electrophoresis

Software Mentioned

rtk
cutadapt
DIAMOND
phyloseq
FastQC
SortMeRNA
global
usearch
R
TrEMBL

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