PMID- 15574945 OWN - NLM STAT- MEDLINE DCOM- 20050215 LR - 20181113 IS - 0099-2240 (Print) IS - 1098-5336 (Electronic) IS - 0099-2240 (Linking) VI - 70 IP - 12 DP - 2004 Dec TI - Shear rate moderates community diversity in freshwater biofilms. PG - 7426-35 AB - The development of freshwater multispecies biofilms at solid-liquid interfaces occurs both in quiescent waters and under conditions of high shear rates. However, the influence of hydrodynamic shear rates on bacterial biofilm diversity is poorly understood. We hypothesized that different shear rates would significantly influence biofilm diversity and alter the relative proportions of coaggregating and autoaggregating community isolates. In order to study this hypothesis, freshwater biofilms were developed at five shear rates (<0.1 to 305 S(-1)) in a rotating concentric cylinder reactor fed with untreated potable water. Eubacterial diversity was assessed by denaturing gradient gel electrophoresis (DGGE) and culturing on R2A agar. Fifty morphologically distinct biofilm strains and 16 planktonic strains were isolated by culturing and identified by partial 16S rRNA gene sequencing, and their relatedness was determined by the construction of a neighbor-joining phylogenetic tree. Phylogenetic and DGGE analyses showed an inverse relationship between shear rate and bacterial diversity. An in vitro aggregation assay was used to assess the relative proportions of coaggregating and autoaggregating species from each biofilm. The highest proportion of autoaggregating bacteria was present at high shear rates (198 to 305 S(-1)). The intermediate shear rate (122 S(-1)) selected for the highest proportion of coaggregating bacteria (47%, or 17 of a possible 36 coaggregation interactions). Under static conditions (<0.1 S(-1)), 41 (33%) of a possible 125 coaggregation interactions were positive. Few coaggregation (3.3%) or autoaggregation (25%) interactions occurred between the 16 planktonic strains. In conclusion, these data show that shear rates affect biofilm diversity as well as the relative proportions of aggregating bacteria. FAU - Rickard, Alexander H AU - Rickard AH AD - School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester, United Kingdom. arickard@mail.nih.gov FAU - McBain, Andrew J AU - McBain AJ FAU - Stead, Amy T AU - Stead AT FAU - Gilbert, Peter AU - Gilbert P LA - eng SI - GENBANK/AJ626875 SI - GENBANK/AJ626876 SI - GENBANK/AJ626877 SI - GENBANK/AJ626878 SI - GENBANK/AJ626879 SI - GENBANK/AJ626880 SI - GENBANK/AJ626881 SI - GENBANK/AJ626882 SI - GENBANK/AJ626883 SI - GENBANK/AJ626884 SI - GENBANK/AJ626885 SI - GENBANK/AJ626886 SI - GENBANK/AJ626887 SI - GENBANK/AJ626888 SI - GENBANK/AJ626889 SI - GENBANK/AJ626890 SI - GENBANK/AJ626891 SI - GENBANK/AJ626892 SI - GENBANK/AJ626893 SI - GENBANK/AJ626894 SI - GENBANK/AJ626895 SI - GENBANK/AJ626896 SI - GENBANK/AJ626897 SI - GENBANK/AJ626898 SI - GENBANK/AJ626899 SI - GENBANK/AJ626900 SI - GENBANK/AJ626901 SI - GENBANK/AJ626902 SI - GENBANK/AJ626903 SI - GENBANK/AJ626904 SI - GENBANK/AJ626905 SI - GENBANK/AJ626906 SI - GENBANK/AJ626907 SI - 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GENBANK/AJ627414 PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Appl Environ Microbiol JT - Applied and environmental microbiology JID - 7605801 RN - 0 (Culture Media) RN - 0 (DNA, Bacterial) RN - 0 (DNA, Ribosomal) RN - 0 (RNA, Ribosomal, 16S) SB - IM MH - Bacteria/*classification/genetics/growth & development MH - Bacterial Adhesion MH - Biofilms/*growth & development MH - Culture Media MH - DNA, Bacterial/analysis MH - DNA, Ribosomal/analysis MH - *Ecosystem MH - Electrophoresis/methods MH - Fresh Water/*microbiology MH - *Genetic Variation MH - Hydrophobic and Hydrophilic Interactions MH - Molecular Sequence Data MH - Plankton/genetics/growth & development MH - Polymerase Chain Reaction MH - RNA, Ribosomal, 16S/genetics MH - *Shear Strength PMC - PMC535146 EDAT- 2004/12/03 09:00 MHDA- 2005/02/16 09:00 PMCR- 2005/04/01 CRDT- 2004/12/03 09:00 PHST- 2004/12/03 09:00 [pubmed] PHST- 2005/02/16 09:00 [medline] PHST- 2004/12/03 09:00 [entrez] PHST- 2005/04/01 00:00 [pmc-release] AID - 70/12/7426 [pii] AID - 0479-04 [pii] AID - 10.1128/AEM.70.12.7426-7435.2004 [doi] PST - ppublish SO - Appl Environ Microbiol. 2004 Dec;70(12):7426-35. doi: 10.1128/AEM.70.12.7426-7435.2004.