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[Influences of Anthropogenic Activities on the Community Structure of N-DAMO Bacteria in the North Canal].

Stream ecosystems are the primary receivers of nutrients and organic carbon exported from terrestrial ecosystems and are profoundly influenced by the land of the surrounding landscape. Anthropogenic activities increased the nutrient and organic carbon levels in both stream and benthic biofilms, which are closely related to the differences in the N-DAMO (Nitrate/nitrite-dependent anaerobic methane oxidation) bacterial communities. We studied N-DAMO bacterial communities in streams flowing through anthropogenic land in the city of Beijing. The results showed that anthropogenic activities increase the nutrient and organic carbon levels both midstream and downstream; these are closely related to the difference in the N-DAMO bacterial communities. Phylogenetic analysis revealed that most of the cloned 16S rRNA and pmoA sequences in the North Canal were similar to those recovered from activated sludge and wastewater. The effect of nitrogen on N-DAMO bacteria in the North Canal mainly depended on the main form of available nitrogen and the source of pollutant. Moreover, N-DAMO bacteria present downstream of the North Canal, had a more connected and modular microbial network than those present midstream, where bacterial communities with tightly connected species that were shown to be more vulnerable and sensitive to various disturbances were found.