Scripts of data selection and analysis: role of community size in driving spatial variation in riverine fish metacommunities around the world

Here we provide R scripts used to select and analyze data to investigate the role of community size in mediate the strength of ecological drift and environmental selection in driving community spatial variation in metacommunities. We selected fish abundance data publicly available and measured community size to model against beta diversity and beta deviation metrics (Shannon and Jaccard-Chao) and against other communities descriptors (evenness, rank difference and richness difference). We also selected environmental variables to measure the strength of community-environment relationships using Hierarchical Modelling of Species Communities and model against community size.