idar (version 1.5)

fdis: Average Functional Dispersion

Description

Computes average Functional Dispersion for several communities.

Usage

fdis(x, traits)

Value

Numeric. The average functional dispersion of the communities in matrix x

Arguments

x

A community data matrix containing the abundances of the species in the different communities. Rows are sites and species are columns.

traits

A distance matrix among species in matrix format, i.e. obtained using as.matrix(d), where d is a dist object from gowdis, dist or similar functions.

Author

Marcelino de la Cruz

Details

This function is a wrap to fdisp in package FD. It manages some of the possible problems that could appear when computing automatically functional dispersion for local communities in ifdar (mainly "empty" communities, common when computing ifdar(r) for very small r's). It is a kind of internal function that wouldn't be usually called by the user.

References

Laliberté, E. and Legendre, P. (2010) A distance-based framework for measuring functional diversity from multiple traits. Ecology 91, 299-305.

See Also

fdisp for a description of the functional dispersion measure (FDis) of Laliberté and Legendre (2010).