specaccum.psr {picante}

Phylogenetic Species Richness Sample-Based Rarefaction Curve

Description

Finds a sample-based rarefaction curve for phylogentic species richness for a set of samples.

Usage

specaccum.psr(samp, tree, permutations = 100, method = "random", ...)

Arguments

samp

Community data matrix

tree

A phylo tree object or a phylogenetic covariance matrix

permutations

Number of permutations with method method= "random"

method

Species accumulation method, currently only "random" is supported which adds samples in random order.

...

Other parameters to functions

Value

The function returns an object of class "specaccum" with items:

call

Function call.

method

Accumulator method.

sites

Number of sites/samples.

richness

The mean phylogenetic species richness corresponding to number of sites/samples.

sd

The standard deviation of phylogenetic apecies accumulation curve (or its standard error) estimated from permutations in method = "random".

perm

Permutation results with method = "random" and NULL in other cases. Each column in perm holds one permutation.

Author(s)

Matthew Helmus [e-mail] based on the vegan package specaccum function by Roeland Kindt and Jari Oksanen.

References

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

Helmus M.R., Bland T.J., Williams C.K. & Ives A.R. (2007) Phylogenetic measures of biodiversity. American Naturalist, 169, E68-E83

See Also

psr, specaccum

Examples

data(phylocom)
accum.sr<-specaccum(phylocom$sample, permutations = 100, method = "random")
plot(accum.sr, col="blue")
points(accum.sr$sites, accum.sr$richness, pch=19, col="blue")

accum.psr<-specaccum.psr(phylocom$sample, phylocom$phylo, permutations = 100, method = "random")
plot(accum.psr, add=TRUE, col = "red")
points(accum.psr$sites, accum.psr$richness, pch=19, col="red")

legend(5,5,legend=c("SR","PSR"),pch=c(19,19),col=c("blue","red"))