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

Here we describe how we obtained and analyzed data for the manuscript: High compositional dissimilarity among small communities is decoupled from environmental variation, accepted for publication in Oikos. (10.1111/oik.09802). A preprint is also available: https://doi.org/10.32942/osf.io/vngse We investigated the role of community size in mediate the strength of ecological drift and environmental selection in driving community spatial variation in metacommunities.