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Title: Press xenobiotic 3-chloroaniline disturbance favors deterministic assembly with a shift in function and structure of bacterial communities in sludge bioreactors
Authors: Santillan, Ezequiel
Seshan, Hari
Wuertz, Stefan
Keywords: Engineering::Civil engineering
Issue Date: 2021
Source: Santillan, E., Seshan, H. & Wuertz, S. (2021). Press xenobiotic 3-chloroaniline disturbance favors deterministic assembly with a shift in function and structure of bacterial communities in sludge bioreactors. ACS ES&T Water, 1(6), 1429-1437.
Journal: ACS ES&T Water
Abstract: Disturbances are thought to affect community assembly mechanisms, which in turn shape community structure and the overall function of the ecosystem. Continuous (press) disturbances can drive ecosystems to alternate stable states of community function and structure, but their effects on assembly mechanisms are still largely unknown. Here, we tested the effect of a press xenobiotic disturbance on the function, structure, and assembly of bacterial communities within a wastewater treatment system. Two sets of four liter sequencing batch reactors were operated in triplicate with and without the addition of 3- chloroaniline for a period of 132 days, following 58 days of acclimation after inoculation with sludge from a full-scale treatment plant. The temporal dynamics of bacterial community structure were derived from 16S rRNA gene amplicon sequencing. Community function, structure, and assembly differed between press disturbed and undisturbed reactors. Temporal partitioning of assembly mechanisms via phylogenetic and taxonomic null modeling analyses revealed that the deterministic assembly prevailed for disturbed bioreactors, while the role of stochastic assembly was stronger for undisturbed reactors. Our findings are relevant because research spanning various disturbance types, environments, and spatiotemporal scales is needed for a comprehensive understanding of the effects of press disturbances on assembly mechanisms, structure, and function of microbial communities.
ISSN: 2690-0637
DOI: 10.1021/acsestwater.1c00018
Schools: School of Civil and Environmental Engineering 
Research Centres: Singapore Centre for Environmental Life Sciences and Engineering (SCELSE) 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS ES&T Water, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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