Freshwater fish functional diversity shows diverse responses to human activities, but consistently declines in the tropics

Freshwater environments are intertwined with human activities and the consequence has been environmental degradation and biodiversity loss. Fish provide key ecological and economic benefits, and fish abundance and diversity can be affected by human activities resulting in functional diversity (FD) changes that might scale up to ecosystem impacts. Changes in FD can be expressed by quantifying its three main FD components temporally and/or spatially: richness, regularity, and divergence. There is no consensus about how human activities affect the main components of FD. In addition, human activities might affect the functional diversity of communities differently in temperate and tropical regions because of differences in the regional pools and the distribution of functional traits. Here, using a meta-analytical approach, we assess how different human activities (e.g., deforestation, invasion, reservoirs) in freshwater system..., Gathering data
We did a systematic search on scopus and web of science for papers that evaluate any human activity impact on freshwater fish functional diversity and we ended with 41 articles after the exclusion of papers that were not adequate:
For the papers that compared functional diversity values from natural against impacted sites, we extracted mean, error and sample size for each study group 
For papers that evaluated changes due human activities through a regression \"functional index vs impact variable\", we extracted the coefficient of correlation and the sample size. Also, we extracted information about the type of human activity and local of the study.
Processing data
With this data, we calculated the effect size through mixed-effects models to evaluate the effect of human activities in functional diversity. We also tested the functional component, local (tropical vs. temperate), and type of human activity as moderators of the analysis. , , # Data from: Freshwater fish functional diversity shows diverse responses to human activities, but consistently declines in the tropics

[https://doi.org/10.5061/dryad.x0k6djhv4](https://doi.org/10.5061/dryad.x0k6djhv4)

## Description of the data and file structure

This dataset contains the data used to compute the mixed-effect models. Each row is an observation of the meta-analysis.

The observations are categorized as Categoric or Correlation. Categoric ones have functional diversity mean, error and replica number for each group (control and treatment). Control is the group with sites under a less stressed environment and Treatment is the group with sites under a higher human pressure. Correlation ones have the value of the coefficient of correlaiton, error and replica number for the relationship \"functional index vs impact variable\". These values were used to calculate the effect size of each obersvation (yi) and its variance (vi). Based on this two latter values, we performed mix...,