期刊
FRONTIERS IN MICROBIOLOGY
卷 11, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2020.01637
关键词
biological nitrogen removal; anammox; CandidatusScalindua; saline wastewaters; genome-resolve; nanopore sequencing; CandidatusBrocadia
类别
资金
- Center Competitive Funding Program [FCC/1/ 1971-05-01]
- King Abdullah University of Science and Technology (KAUST) [15510]
- VILLUM FONDEN
There is a lack of understanding of the interaction between anammox bacteria and the flanking microbial communities in both freshwater (non-saline) and marine (saline) ecosystems. Here, we present a comparative genome-based exploration of two different anammox bioreactors, through the analysis of 23 metagenome-assembled genomes (MAGs), 12 from freshwater anammox reactor (FWR), and 11 from marine anammox reactor (MWR). To understand the contribution of individual members to community functions, we applied the index of replication (iRep) to determine bacteria that are actively replicating. Using genomic content and iRep information, we provided a potential ecological role for the dominant members of the community based on the reactor operating conditions. In the non-saline system, anammox (CandidatusBrocadia sinica) and auxotrophic neighboring bacteria belonging to the phylaIgnavibacteriaeandChlorofleximight interact to reduce nitrate to nitrite for direct use by anammox bacteria. Whereas, in the saline reactor, anammox bacterium (Ca. Scalindua erythraensis) and flanking community belonging to phylaPlanctomycetes(different than anammox bacteria)-which persistently growing in the system-may catabolize detritus and extracellular material and recycle nitrate to nitrite for direct use by anammox bacteria. Despite different microbial communities, there was functional redundancy in both ecosystems. These results signify the potential application of marine anammox bacteria for treating saline N-rich wastewaters.
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