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    Microbial competition among anammox bacteria in nitrite-limited bioreactors

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    Type
    Article
    Authors
    Zhang, Lei
    Narita, Yuko
    Gao, Lin
    Ali, Muhammad cc
    Oshiki, Mamoru
    Ishii, Satoshi
    Okabe, Satoshi
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2017-08-26
    Online Publication Date
    2017-08-26
    Print Publication Date
    2017-11
    Permanent link to this record
    http://hdl.handle.net/10754/625410
    
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    Abstract
    Phylogenetically diverse anammox bacteria have been detected in most of anoxic natural and engineered ecosystems and thus regarded as key players in the global nitrogen cycle. However, ecological niche differentiation of anammox bacteria remains unresolved despite its ecological and practical importance. In this study, the microbial competitions for a common substrate (nitrite) among three anammox species (i.e. “Candidatus Brocadia sinica”, “Candidatus Jettenia caeni” and “Candidatus Kuenenia stuttgartiensis”) were systematically investigated in nitrite-limited gel-immobilized column reactors (GICR) and membrane bioreactors (MBRs) under different nitrogen loading rates (NLRs). 16 S rRNA gene-based population dynamics revealed that “Ca. J. caeni” could proliferate only at low NLRs, whereas “Ca. B. sinica” outcompeted other two species at higher NLRs in both types of reactors. Furthermore, FISH analysis revealed that “Ca. J. caeni” was mainly present as spherical microclusters at the inner part (low NO2− environment), whereas “Ca. B. sinica” was present throughout the gel beads and granules. This spatial distribution supports the outcomes of the competition experiments. However, the successful competition of “Ca. J. caeni” at low NLR could not be explained with the Monod model probably due to inaccuracy of kinetic parameters such as half saturation constant (Ks) for nitrite and a difference in the maintenance rate (m). In addition, the growth of “Ca. K. stuttgartiensis” could not be observed in any experimental conditions, suggesting possible unknown factor(s) is missing. Taken together, NLR was one of factors determining ecological niche differentiation of “Ca. B. sinica” and “Ca. J. caeni”.
    Citation
    Zhang L, Narita Y, Gao L, Ali M, Oshiki M, et al. (2017) Microbial competition among anammox bacteria in nitrite-limited bioreactors. Water Research. Available: http://dx.doi.org/10.1016/j.watres.2017.08.052.
    Sponsors
    This research was financially supported by Nagase Science Technology Foundation and Institute for Fermentation, Osaka, which were granted to Satoshi Okabe. Lei Zhang was supported partly by the Monbukagakusho Honors Scholarship for Privately Financed International Students offered by the Ministry of Education, Culture, Sports, Science and Technology, Japan. Post-Doctoral Fellowship of Muhammad Ali was sponsored by Graduate school of Engineering, Hokkaido University, Japan.
    Publisher
    Elsevier BV
    Journal
    Water Research
    DOI
    10.1016/j.watres.2017.08.052
    PubMed ID
    28865374
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0043135417307145
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.watres.2017.08.052
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC)

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