alpha.fd.multidim {mFD}

Compute a set of alpha functional indices for a set of assemblages

Description

This function computes a set of multidimensional space based indices of alpha functional diversity. The user can choose which functional indices to compute.

Usage

alpha.fd.multidim(
  sp_faxes_coord,
  asb_sp_w,
  ind_vect = c("fide", "fdis", "fmpd", "fnnd", "feve", "fric", "fdiv", "fori", "fspe"),
  scaling = TRUE,
  check_input = TRUE,
  details_returned = TRUE,
  verbose = TRUE
)

Arguments

sp_faxes_coord

a matrix of species coordinates in a chosen functional space. Species coordinates have been retrieved thanks to tr.cont.fspace or quality.fspaces.

asb_sp_w

a matrix linking weight of species (columns) and a set of assemblages (rows).

ind_vect

a vector of character string of the name of functional indices to compute. Indices names must be written in lower case letters. Possible indices to compute are: 'fide', fdis', 'fmpd', 'fnnd', 'feve', 'fric', 'fdiv', 'fori' and 'fspe'. Default: all the indices are computed.

scaling

a logical value indicating if scaling is to be done (TRUE) or not (FALSE) on functional indices. Scaling is used to be able to compare indices values between assemblages. Default: scaling = TRUE.

check_input

a logical value indicating whether key features the inputs are checked (e.g. class and/or mode of objects, names of rows and/or columns, missing values). If an error is detected, a detailed message is returned. Default: check.input = TRUE.

details_returned

a logical value indicating whether the user want to store details. Details are used in graphical functions and thus must be kept if the user want to have graphical outputs for the computed indices.

verbose

a logical value indicating whether progress details should be printed in the console. If FALSE does not provide percent progress when computing diversity indices.

Value

The following list is returned:

• functional_diversity_indices matrix containing indices values (columns) for each assemblage (rows)

• details list: a asb_sp_occ data.frame of species occurrences in each assemblage ; a asb_sp_relatw matrix of relative weight of species in each assemblage ; a sp_coord_all_asb list of matrices of species coordinates along functional axes for species present in each assemblage ; a vert_nm_all_asb list of vectors of species names being vertices of the convex hull for each assemblage ; a mst_all_asb list of data.frames summarizing link between species in the minimum spanning tree of each assemblage ; a grav_center_vert_coord_all_asb list of vectors of coordinates of the vertices gravity center for each assemblage ; a mean_dtogravcenter_all_asb list of vectors containing mean distance to the species gravity center for each assemblage ; a dist_gravcenter_global_pool vector containing the distance of each species to the gravity center of all species from the global pool ; a dist_nn_global_pool data.frame showing the distances of each species from the global pool to its nearest neighbor ; a nm_nn_all_asb data.frame containing the name of each nearest neighbor of each species present in a given assemblage ; a dist_nn_all_asb data.frame containing distance of each species present in a given assemblage to its nearest neighbor.

Author(s)

Camille Magneville and Sebastien Villeger

Examples

# Load Species*Traits dataframe:
data('fruits_traits', package = 'mFD')

# Load Assemblages*Species dataframe:      
data('baskets_fruits_weights', package = 'mFD')

# Load Traits categories dataframe:
data('fruits_traits_cat', package = 'mFD')  
 
# Compute functional distance 
sp_dist_fruits <- mFD::funct.dist(sp_tr         = fruits_traits,
                                  tr_cat        = fruits_traits_cat,
                                  metric        = "gower",
                                  scale_euclid  = "scale_center",
                                  ordinal_var   = "classic",
                                  weight_type   = "equal",
                                  stop_if_NA    = TRUE)
 
# Compute functional spaces quality to retrieve species coordinates matrix:
fspaces_quality_fruits <- mFD::quality.fspaces(
  sp_dist             = sp_dist_fruits, 
  maxdim_pcoa         = 10,
  deviation_weighting = 'absolute',
  fdist_scaling       = FALSE,
  fdendro             = 'average')
  
# Retrieve species coordinates matrix:
sp_faxes_coord_fruits <- fspaces_quality_fruits$details_fspaces$sp_pc_coord

# Compute alpha diversity indices
alpha_fd_indices_fruits <- mFD::alpha.fd.multidim(
  sp_faxes_coord   = sp_faxes_coord_fruits[, c('PC1', 'PC2', 'PC3', 'PC4')],
  asb_sp_w         = baskets_fruits_weights, 
  ind_vect         = c('fdis', 'fmpd', 'fnnd', 'feve', 'fric', 'fdiv', 
                       'fori', 'fspe'),
  scaling          = TRUE, 
  check_input      = TRUE, 
  details_returned = TRUE)
  
# Retrieve alpha diversity indices table
fd_ind_values_fruits <- alpha_fd_indices_fruits$functional_diversity_indices
fd_ind_values_fruits