richRarefy {wiqid}

Sample-based rarefaction curves

Description

Uses Mao's tau estimator (Colwell et al, 2004) to obtain a rarefaction curve indicating the expected number of species observed if fewer samples were collected.

Usage

richRarefy(incmat)

Arguments

incmat

a 1/0 matrix of species incidence (presence), species x sites. A matrix of counts may also be provided.

Value

A matrix with columns for the estimate and its standard deviation and rows for the number of samples pooled. Confidence limits may be obtained with estimate +/- 1.96 * SD.

Author(s)

Mike Meredith

References

Colwell, R. K., C. X. Mao, & J. Chang. 2004. Interpolating, extrapolating, and comparing incidence-based species accumulation curves. Ecology 85, 2717-2727.

Examples

data(seedbank)
plot(richRarefy(seedbank)[, 1], type='l')