Fig. 2

The relationship between mean rrn copy number and (a) dilution level, (b) species richness, and (c) Shannon index in the microcosm study. Mean rrn copy number is the abundance-weighted mean rRNA operon copy number. Dilution level equals to the logarithmically transformed dilution factor based on 10. Species richness is logarithmically transformed based on 10. The lines show the result of linear regression and the shaded areas represent 95% confidence intervals. Here, r represents the Pearson’s correlation and *** represents P < 0.001