title: Impact of Bioreactor Environment and Recovery Method on the Profile of Bacterial Populations from Water Distribution Systems.
abstract: Multiple rotating annular reactors were seeded with biofilms flushed from water distribution systems to assess (1) whether biofilms grown in bioreactors are representative of biofilms flushed from the water distribution system in terms of bacterial composition and diversity, and (2) whether the biofilm sampling method affects the population profile of the attached bacterial community. Biofilms were grown in bioreactors until thickness stabilized (9 to 11 weeks) and harvested from reactor coupons by sonication, stomaching, bead-beating, and manual scraping. High-throughput sequencing of 16S rRNA amplicons was used to profile bacterial populations from flushed biofilms seeded into bioreactors as well as biofilms recovered from bioreactor coupons by different methods. β diversity between flushed and reactor biofilms was compared to β diversity between (i) biofilms harvested from different reactors and (ii) biofilms harvested by different methods from the same reactor. These analyses showed that average diversity between flushed and bioreactor biofilms was double the diversity between biofilms from different reactors operated in parallel. The diversity between bioreactors was larger than the diversity associated with different biofilm recovery methods. Compared to other experimental variables, the method used to recover biofilms had a negligible impact on the outcome of water biofilm analyses based on 16S amplicon sequencing. Results from this study show that biofilms grown in reactors over 9 to 11 weeks are not representative models of the microbial populations flushed from a distribution system. Furthermore, the bacterial population profile of biofilms grown in replicate reactors from the same flushed water are likely to diverge. However, four common sampling protocols, which differ with respect to disruption of bacterial cells, provide similar information with respect to the 16S rRNA population profile of the biofilm community.
authors.affiliation: Lehigh University, Department of Civil and Environmental Engineering, 1 W. Packer Avenue, Bethlehem, Pennsylvania, United States of America.
authors.forename: Xia
authors.initials: X
authors.lastname: Luo
authors.affiliation: Lehigh University, Department of Civil and Environmental Engineering, 1 W. Packer Avenue, Bethlehem, Pennsylvania, United States of America.
authors.forename: Kristen L
authors.initials: KL
authors.lastname: Jellison
authors.affiliation: Cummings School of Veterinary Medicine at Tufts University, Department of Infectious Disease and Global Health, North Grafton, Massachusetts, United States of America.
authors.forename: Kevin
authors.initials: K
authors.lastname: Huynh
authors.affiliation: Cummings School of Veterinary Medicine at Tufts University, Department of Infectious Disease and Global Health, North Grafton, Massachusetts, United States of America.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Widmer
mesh_terms: D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000254:growth & development*; D044822:Biodiversity; D018441:Biofilms / Q000254:growth & development*; D019149:Bioreactors / Q000382:microbiology*; D014644:Genetic Variation; D057166:High-Throughput Screening Assays; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013045:Species Specificity; D014871:Water Microbiology; D060753:Water Quality / Q000592:standards; D014881:Water Supply
chemical_list: D012336:RNA, Ribosomal, 16S