Extended Data Fig. 5: Standard deviations of daily abundance changes decrease with increasing average daily abundances for individual OTUs.

Standard deviations of changes in daily OTU abundance as a function of the average OTU abundance; the standard deviations were calculated, for each OTU separately, across bins of various daily OTU abundances. The abundance bins were selected to have an equal number of time points in each bin. Panel a shows the relationships for each OTU in Human A. Dotted lines represent regression fits to the data for each OTU. Panels are sorted according to the p-value of the regression fits, and the slopes of the fits are shown in the top right corner of each panel (n=7). The 48 out of the total of 65 OTUs shown here are significant, based on the FDR cutoff of 10% (the Benjamini-Hochberg method). b, Distribution of slopes of the linear regression fits across 154 OTUs and the four human datasets. Only the OTUs with regression p-values significant based on the FDR cutoff of 10% are shown.