indspc {labdsv}R Documentation

Compositional Indicator Species Analysis

Description

Calculates the mean similarity of all plots in which a species occurs.

Usage

indspc(veg,dis)

Arguments

veg a data frame of taxa, samples as rows, species as columns
dis an object of class ‘dist’ from dist, vegist, or dsvdis

Value

a data frame with species name, mean similarity, and number of occurrences

Note

One measure of the habitat specificity of a species is the idegree to which a species only occurs in communities that are similar to each other. This function calculates the mean similarity of all samples in which each species occurs. The mean similarity of species which only occur once is set as 0, rather than NA.

Author(s)

David W. Roberts droberts@montana.edu http://ecology.msu.montana.edu/labdsv

See Also

duleg,duarm

Examples

data(bryceveg) # returns a vegetation dataframe
dis.bc <- dsvdis(bryceveg,'bray/curtis')
    # returns a Bray/Curtis dissimilarity matrix
indspc(bryceveg,dis.bc)

[Package labdsv version 1.0-1 Index]