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Changes in the proportion of the sewage microbial community with time. The open circle at 1.0 represents the assumed fraction of the microbial community from sewage in the filtered-seawater-plus-sewage mixture at 0 h. The fraction of the microbial community from sewage in the unfiltered-seawater-plus-sewage mixture at 0 h is less than 1 because the community contains microorganisms from both sewage and seawater. Time since the start of the experiment is shown on the x axis.
