ecospat (version 3.3)

ecospat.co_occurrences: Species Co-Occurrences

Description

Calculate an index of species co-occurrences.

Usage

ecospat.co_occurrences (data)

Value

The species co-occurrence matrix and box-plot of the co-occurrence indices

Arguments

data

A presence-absence matrix for each species (columns) in each location or grid cell (rows) or a matrix with predicted suitability values.

Author

Loic Pellissier

Details

Computes an index of co-occurrences ranging from 0 (never co-occurring) to 1 (always co-occuring).

References

Pellissier, L., K.A. Brathen, J. Pottier, C.F. Randin, P. Vittoz, A. Dubuis, N.G. Yoccoz, T. Alm, N.E. Zimmermann and A. Guisan. 2010. Species distribution models reveal apparent competitive and facilitative effects of a dominant species on the distribution of tundra plants. Ecography, 33, 1004-1014.

Guisan, A. and N. Zimmermann. 2000. Predictive habitat distribution models in ecology. Ecological Modelling, 135:147-186

Examples

# \donttest{
matrix <- ecospat.testData[c(9:16,54:57)]
ecospat.co_occurrences (data=matrix)
# }