spaa (version 0.2.2)

niche.overlap.boot: Boostrap of niche overlap

Description

Bootstrap of niche overlap between species.

Usage

niche.overlap.boot(mat, method = c("pianka", "schoener", "petraitis",   "czech", "morisita", "levins"), times = 999, quant = c(0.025, 0.975))

Arguments

mat

A community data matrix with columns representing species, and rows representing sites.

method

A character string indicating the index of niche overlap to be applied.

times

Interger, Number of bootstrap to be implemented.

quant

Quantile of bootstrap results, the confidence intervals.

Value

a data frame with each row for each pair of species the columns are "Observed", \ "Boot mean", \ "Boot std", \ "Boot CI1", \ "Boot CI2", \ "times" \

Details

This function bootstraps the niche overlap within each pair of species. \ pianka: Pianka's niche overlap index\ schoener: Schoener's niche overlap index\ petraitis: Petraitis' niche overlap index\ czech: Czechanowski index \ morisita: Morisita's overlap index\ levins: Levin's overlap index\ see more information from Gotelli, N(2009).\

References

Zhang Jin-tun,(2004 ) Quantitative Ecology, Science Press, Beijing\

Nicholas J. Gotelli. 2000. Null model analysis of species co-occurrence patterns. Ecology 81:2606-2621. http://esapubs.org/archive/ecol/E081/022/EcoSim

See Also

niche.overlap.boot.pair

Examples

data(datasample)
niche.overlap.boot(datasample[,1:4], method = "pianka")
niche.overlap.boot(datasample[,1:4], method = "schoener")
niche.overlap.boot(datasample[,1:4], method = "czech") 
niche.overlap.boot(datasample[,1:4], method = "levins")