Extended Data Fig. 7: Long-term drift of individual OTU abundances.
a, Mean-squared displacements of log-relative abundance for individual OTUs <δ2(Δt)> as a function of time Δt. Dashed lines represent regression fits to data, using the abnormal diffusion equation <δ2(Δt)>∝Δt2H, where H is the Hurst exponent characterizing the diffusion process. Panels correspond to individual OTUs from human A. The Hurst exponents were determined using least squared regression fits to n = 100 data points for each OTU (see Methods). b, Distributions of Hurst exponents across individual OTUs in humans A, B, M3, F4. The Hurst exponents describing the abundance drift of the entire bacterial communites in each human are indicated by dashed lines.
