fd_feve {fundiversity}

Compute Functional Evenness (FEve)

Description

This function computes Functional Evenness (FEve) following Villéger et al. (2008). NB: By definition FEve is equal to NA when the number of species per site is strictly lower than 3.

Usage

fd_feve(traits = NULL, sp_com, dist_matrix = NULL)

Arguments

traits

Trait matrix with species as rows and traits as columns. It has to contain exclusively numerical values. This can be either a matrix, a data.frame, or a Matrix::Matrix() object.

sp_com

Site-species matrix with sites as rows and species as columns if not provided, the function considers all species with equal abundance in a single site. This can be either a matrix, a data.frame, or a Matrix::Matrix() object.

dist_matrix

A dissimilarity matrix that can be provided instead of a trait data.frame (default: NULL). This can be either a matrix, a data.frame, or a Matrix::Matrix() object.

Value

a data.frame with two columns:

• site character column that contains site names based on input sp_com row names,

• FEve numeric column that contains FEve values corresponding to each site.

NB: By definition FEve is equal to NA when the number of species per site is strictly lower than 3.

Parallelization

The computation of this function can be parallelized thanks to future::plan(). To get more information on how to parallelize your computation please refer to the parallelization vignette with: vignette("fundiversity_1-parallel", package = "fundiversity")

References

Villéger, S., Mason, N.W.H., Mouillot, D., 2008. New Multidimensional Functional Diversity Indices for a Multifaceted Framework in Functional Ecology. Ecology 89, 2290–2301. doi:10.1890/07-1206.1

Examples

data(traits_birds)
fd_feve(traits_birds)