The supplementary materials for the article "Synthesis reveals approximately balanced biotic differentiation and homogenization" by Shane A. Blowes et al. include a series of figures and data files that support the main findings of the study. The figures illustrate species occupancy and richness changes under different scenarios, map the central coordinates of each dataset region, show model estimates of change for each region, and explore the relationship between biotic homogenization and data availability. The data file provides complete citations for the data sources used in the analyses. The figures and data files collectively demonstrate the dynamics of biodiversity changes at different scales (α and γ) and highlight the association between biotic homogenization and data sets with limited time points, particularly at intermediate to large temporal and spatial scales.The supplementary materials for the article "Synthesis reveals approximately balanced biotic differentiation and homogenization" by Shane A. Blowes et al. include a series of figures and data files that support the main findings of the study. The figures illustrate species occupancy and richness changes under different scenarios, map the central coordinates of each dataset region, show model estimates of change for each region, and explore the relationship between biotic homogenization and data availability. The data file provides complete citations for the data sources used in the analyses. The figures and data files collectively demonstrate the dynamics of biodiversity changes at different scales (α and γ) and highlight the association between biotic homogenization and data sets with limited time points, particularly at intermediate to large temporal and spatial scales.