Functions to Compute Compositional Turnover Using Zeta Diversity R package zetadiv version 1.3.0 Functions to compute compositional turnover using zeta-diversity, the number of species shared by multiple assemblages. The package includes functions to compute zeta-diversity for a specific number of assemblages and to compute zeta-diversity for a range of numbers of assemblages. It also includes functions to explain how zeta-diversity varies with distance and with differences in environmental variables between assemblages, using generalised linear models, linear models with negative constraints, generalised additive models,shape constrained additive models, and I-splines. Software Depends: R (>= 4.5.0), scam Imports: stats, graphics, grDevices, utils, car, mgcv, vegan, geodist, nnls, glm2 Guillaume Latombe <latombe.guillaume@gmail.com> Comprehensive R Archive Network (CRAN) Guillaume Latombe [aut, cre], Melodie A. McGeoch [aut], David A. Nipperess [aut], Cang Hui [aut] GPL-3 2025-05-28 application/tgz https://CRAN.R-project.org/package=zetadiv doi:10.32614/CRAN.package.zetadiv