title: Linking operation parameters and environmental variables to population dynamics of Mycolata in a membrane bioreactor.
abstract: The community structure and population dynamics of Mycolata were monitored in a full-scale membrane bioreactor during four experimental phases under changing operating and environmental conditions, by means of temperature-gradient gel electrophoresis of partial 16S-rRNA genes amplified from community DNA and RNA templates (total and active populations). Non-metric multidimensional scaling and BIO-ENV analyses demonstrated that population dynamics were mostly explained (30-32%) by changes in the input of nutrients in the influent water and the accumulation of biomass in the bioreactors, while the influence of hydraulic and solid retention times, temperature and F/M ratio was minor. Significant correlations were observed between particular Mycolata phylotypes and one or more variables, contributing information for the prediction of their abundance and activity under changing conditions. Fingerprinting and multivariate analyses demonstrated that two foaming episodes, recorded at temperatures <20°C, were connected to the increase of the relative abundance of Mycolata unrelated to Gordonia amarae.
authors.affiliation: Department of Microbiology and Institute of Water Research, University of Granada, Granada, Spain. Electronic address: paulamaza@ugr.es.
authors.forename: P
authors.initials: P
authors.lastname: Maza-Márquez
authors.affiliation: Department of Microbiology and Institute of Water Research, University of Granada, Granada, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Gómez-Silván
authors.affiliation: Department of Civil Engineering and Institute of Water Research, University of Granada, Granada, Spain.
authors.forename: M A
authors.initials: MA
authors.lastname: Gómez
authors.affiliation: Department of Microbiology and Institute of Water Research, University of Granada, Granada, Spain.
authors.forename: J
authors.initials: J
authors.lastname: González-López
authors.affiliation: Department of Microbiology and Institute of Water Research, University of Granada, Granada, Spain.
authors.forename: M V
authors.initials: MV
authors.lastname: Martínez-Toledo
authors.affiliation: Department of Microbiology and Institute of Water Research, University of Granada, Granada, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Rodelas
mesh_terms: D039903:Actinobacteria / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D044822:Biodiversity; D019149:Bioreactors / Q000382:microbiology*; D016000:Cluster Analysis; D018076:DNA, Complementary; D058645:Denaturing Gradient Gel Electrophoresis; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods
chemical_list: D018076:DNA, Complementary; D012336:RNA, Ribosomal, 16S
keywords: Membrane bioreactor (MBR); Mycolata; Non-metric multidimensional scaling (MDS); cDNA-based fingerprinting; gDNA-based fingerprinting