raref: Estimates the species richness for a given number of sampled...

In rich: Computes and Compares Species Richnesses

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 <10 or NULL are set to 99.

Value

raref returns a list with two components.

rar	A data frame with three columns giving the observed species richness for different sample size and corresponding density of individuals.
Sinterp	A vector with the term dens and the corresponding interpolated species richness.

Author(s)

Jean-Pierre Rossi [e-mail]

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)

rich documentation built on May 2, 2019, 5:25 p.m.