rich (version 1.0.1)

raref: Estimates the species richness for a given number of sampled individuals on the basis of the corresponding rarefaction curve

Description

raref computes rarefaction curve and interpolates the species richness corresponding to a given density of individuals.

Usage

raref(matrix, dens, nrandom=99)

Arguments

matrix

matrix is a typical species-sample matrix. Rows correspond to samples whereas columns stand for species.

dens

A number corresponding to the density for which a species richness estimation is required. dens must be comprised within the range of the observed density.

nrandom

nrandom is the number of a randomizations used in the bootstrap estimation. Values of nrandom

Value

returns a list with two components. returns a list with two components.

References

Gotelli, N., Colwell, R. (2001). Quantifying biodiversity: procedures and pitfalls in the measurement and comparison of species richness. Ecology Letters 4, 379-391.

See Also

rarc, raref2, rich

Examples

## Not run: 
# data(ef)
# raref(ef, dens=1100, nrandom=100)
# ## End(Not run)