ecospat (version 2.0)

ecospat.niche.equivalency.test: Niche Equivalency Test

Description

Run a niche equivalency test (see Warren et al 2008) based on two species occurrence density grids.

Usage

ecospat.niche.equivalency.test (z1, z2, rep)

Arguments

z1

Species 1 occurrence density grid created by ecospat.grid.clim.

z2

Species 2 occurrence density grid created by ecospat.grid.clim.

rep

The number of replications to perform.

Value

Details

Compares the observed niche overlap between z1 and z2 to overlaps between random niches z1.sim and z2.sim, which are built from random reallocations of occurences of z1 and z2.

References

Broennimann, O., M.C. Fitzpatrick, P.B. Pearman,B. Petitpierre, L. Pellissier, N.G. Yoccoz, W. Thuiller, M.J. Fortin, C. Randin, N.E. Zimmermann, C.H. Graham and A. Guisan. 2012. Measuring ecological niche overlap from occurrence and spatial environmental data. Global Ecology and Biogeography, 21, 481-497.

Warren, D.L., R.E. Glor and M. Turelli. 2008. Environmental niche equivalency versus conservatism: quantitative approaches to niche evolution. Evolution, 62, 2868-2883.

See Also

ecospat.grid.clim.dyn, ecospat.niche.similarity.test