Fig 3.

Change in 16S rRNA gene copy number for total archaea in the recyclostat (diamonds) and batch (squares) cultures over time. The horizontal arrow indicates the time both cultures were supplemented with 0.1× RE; the vertical arrow indicates the time at which batch cultures were supplemented with 1× RE. Representative data are shown. Boxed numbers indicate the change in relative abundance of the root clade in batch culture over the time period indicated (see the text). Point values indicate the means and error bars indicate the standard deviations from three replicate PCRs (tested in duplicate).