Fig. 2. Diversity and absolute abundance of the dominant phylotypes in samples from initial filter mating and serial growth experiments.

The top and bottom panels present results from the serial growth experiments in SW (a) and MC (b) media, respectively. (R recipient pools; T transconjugant pools). Within each main panel, the top subpanel show the Shannon diversity index; the middle subpanel, the log2-transformed absolute abundance of the 20 most abundant genera; and the bottom subpanel, the number of unique orders in SW samples (a) and relative abundance of Enterobacteriales (with and without lactose fermenting ability) in MC samples (b). Sampling date is indicated as D2, D4, D6, D8, and D10 on X-axis. Shannon indexes of replicates were plotted along Y-axis and grouped by sampling date, otherwise each replicate data were plotted along X-axis and grouped by sampling date. Scale bar on the right is log2-transformed absolute abundance.