Global patterns and determinants of multiple facets of freshwater fishes beta diversity

Global patterns of freshwater fish species diversity and their natural and anthropogenic determinants are relatively well documented. Yet, determinants of fish dissimilarity (beta diversity) across river basins remain poorly understood. Here, we quantify taxonomic, functional, and phylogenetic beta diversity of freshwater fish across global river basins and identify the key environmental and historical drivers shaping these patterns. We used a global database of freshwater fishes, a trait database based on morphological descriptions and phylogenetic information calculated by phylogenetic distances. We assessed multiple facets of fish beta diversity and partitioned beta diversity into turnover and nestedness components to assess their contributions. Spearman correlation analysis was conducted to assess the relationships between them and their components. We then applied a boosted regression tree (BRT) model to assess their relationship with key environmental, spatial, and historical vari..., , # Global patterns and determinants of multiple facets of freshwater fishes beta diversity

Dataset DOI: [10.5061/dryad.dncjsxmbh](10.5061/dryad.dncjsxmbh)

#### Overview

This dataset accompanies the study *“Global patterns and determinants of multiple facets of freshwater fishes beta diversity”*. It contains basin-level species occurrence data, morphological trait data, phylogenetic information, environmental variables, and derived beta diversity metrics for global freshwater fish assemblages. All data processing, analyses, and figure generation were conducted in **R**.

#### File Structure

The archive **CodaAndData.zip** contains two main directories:

* `data/` – Data files used and generated in this study
* `R code/` – R scripts used for data processing, analysis, and figure production

#### Data Files (`data/`)

All data files are stored in **`.RData`** **format** and can be loaded in R using the `load()` function.

#### Description of data files

**tree_10705**\
Phylogenetic tree...,