TY - JOUR
T1 - Phylogenetic analysis of nitrate- and sulfate-reducing bacteria in a hydrogen-fed biofilm
AU - Ontiveros-Valencia, Aura
AU - Ilhan, Zehra Esra
AU - Kang, Dae Wook
AU - Rittmann, Bruce
AU - Krajmalnik-Brown, Rosa
PY - 2013/7/1
Y1 - 2013/7/1
N2 - Using two membrane biofilm reactors in which hydrogen (H2) was the only exogenous electron donor, we studied the microbial community structure of biofilms composed primarily of denitrifying bacteria (DB) and sulfate-reducing bacteria (SRB). In steady-state EDvSS, H2 availability was restricted and varied. In steady-state EAvSS, the input nitrate (NO3 -) concentration was varied relative to a fixed sulfate (SO4 2-) concentration. SRB co-existed with DB, even when SO4 2- reduction was absent due to restricted H2 availability. UniFrac and principal coordinate analysis indicated that H2 availability and electron-acceptor loadings framed the microbial community structure, with H2 availability having a greater impact. In EDvSS, restricted H2 availability favored heterotrophic DB (i.e. Burkholderiales) compared with autotrophic DB (e.g. Hydrogenophilales and Rhodocyclales). In EAvSS, SO4 2- reduction lowered the relative abundance of some DB (e.g. Hydrogenophilales), and the biofilm was colonized by Desulfovibrionales and Bacteroidales. Reinforcing the impact of H2 availability, EAvSS showed a higher microbial diversity and more even distribution among microbial groups than did EDvSS. Thus, the biofilm community in a H2-fed biofilm with DB and SRB became more heterotrophic when the H2 availability was constrained, while low NO3 - loading allowed more SO4 2- reduction, causing a shift to more SRB.
AB - Using two membrane biofilm reactors in which hydrogen (H2) was the only exogenous electron donor, we studied the microbial community structure of biofilms composed primarily of denitrifying bacteria (DB) and sulfate-reducing bacteria (SRB). In steady-state EDvSS, H2 availability was restricted and varied. In steady-state EAvSS, the input nitrate (NO3 -) concentration was varied relative to a fixed sulfate (SO4 2-) concentration. SRB co-existed with DB, even when SO4 2- reduction was absent due to restricted H2 availability. UniFrac and principal coordinate analysis indicated that H2 availability and electron-acceptor loadings framed the microbial community structure, with H2 availability having a greater impact. In EDvSS, restricted H2 availability favored heterotrophic DB (i.e. Burkholderiales) compared with autotrophic DB (e.g. Hydrogenophilales and Rhodocyclales). In EAvSS, SO4 2- reduction lowered the relative abundance of some DB (e.g. Hydrogenophilales), and the biofilm was colonized by Desulfovibrionales and Bacteroidales. Reinforcing the impact of H2 availability, EAvSS showed a higher microbial diversity and more even distribution among microbial groups than did EDvSS. Thus, the biofilm community in a H2-fed biofilm with DB and SRB became more heterotrophic when the H2 availability was constrained, while low NO3 - loading allowed more SO4 2- reduction, causing a shift to more SRB.
KW - Autotrophs
KW - Community structure
KW - Electron acceptor
KW - Electron-donor availability
KW - Heterotrophs
KW - Pyrosequencing
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U2 - 10.1111/1574-6941.12107
DO - 10.1111/1574-6941.12107
M3 - Article
C2 - 23480779
AN - SCOPUS:84879417977
VL - 85
SP - 158
EP - 167
JO - FEMS Microbiology Ecology
JF - FEMS Microbiology Ecology
SN - 0168-6496
IS - 1
ER -