title: Spatial distribution of bacterial communities in sediment of a eutrophic lake revealed by denaturing gradient gel electrophoresis and multivariate analysis.
abstract: Bacterial community structure and the effects of several environmental factors on the microbial community distribution were investigated in the sediment of the eutrophic Lake Xuanwu. Profiles of bacterial communities were generated using denaturing gradient gel electrophoresis (DGGE), and the results were interpreted with multivariate statistical analysis. Five major variables in sediment were examined in a principal component analysis, which indicates notable differences of physicochemical parameters among different sites of the lake. To assess changes in the genetic diversity of bacterial communities of different sampling sites, DGGE band patterns were analyzed by multidimensional scaling analysis, which indicated that sampling sites having similar environmental characteristics also have the similar microbial communities. Canonical correspondence analysis demonstrated that pH and redox potential had significant effects on the bacterial community composition in the sediments. Analysis of DNA sequences revealed that the dominant bacterial groups in Lake Xuanwu belonged to Proteobacteria, Actinobacteria, Verrucomicrobia, and Nitrospirae, which are commonly isolated from freshwater ecosystems.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Zeng
authors.forename: Liu-Yan
authors.initials: LY
authors.lastname: Yang
authors.forename: Yi
authors.initials: Y
authors.lastname: Liang
authors.forename: Jia-Yun
authors.initials: JY
authors.lastname: Li
authors.forename: Lin
authors.initials: L
authors.lastname: Xiao
authors.forename: Li-Juan
authors.initials: LJ
authors.lastname: Jiang
authors.forename: Da-Yong
authors.initials: DY
authors.lastname: Zhao
mesh_terms: D039903:Actinobacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D020561:Alphaproteobacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D020562:Betaproteobacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D002681:China; D002695:Chlamydiales / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D004269:DNA, Bacterial / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D004591:Electrophoresis, Polyacrylamide Gel; D005068:Eutrophication; D005618:Fresh Water; D014644:Genetic Variation; D019015:Geologic Sediments / Q000032:analysis* / Q000382:microbiology*; D015999:Multivariate Analysis; D009691:Nucleic Acid Denaturation; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D014871:Water Microbiology
chemical_list: D004269:DNA, Bacterial