Extended Data Fig. 2: Compositional effects on the distribution of daily abundance changes for bacterial communities with various diversities.

Simulations of bacterial community dynamics (with N=65 OTUs) were performed using the Ornstein-Uhlenbeck process. Black dots represent the resulting distributions of daily absolute abundance changes, while hollow dots represent the distributions of daily relative abundance changes. In panels (a-c), steady-state OTU abundances in each community were sampled from a power law, where the power law exponent was selected to generate bacterial communities with different diversities; community diversities were quantified by the effective number of species (ENS = e^H, where H is the Shannon diversity). In (d), the simulated steady-state OTU abundances were equal to those in the real data. In all panels, solid lines represent Gaussian distribution fits to the simulated data.