ecospat.co_occurrences | R Documentation |
Calculate an index of species co-occurrences.
ecospat.co_occurrences (data)
data |
A presence-absence matrix for each species (columns) in each location or grid cell (rows) or a matrix with predicted suitability values. |
Computes an index of co-occurrences ranging from 0 (never co-occurring) to 1 (always co-occuring).
The species co-occurrence matrix and box-plot of the co-occurrence indices
Loic Pellissier loic.pellissier@unifr.ch
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
matrix <- ecospat.testData[c(9:16,54:57)]
ecospat.co_occurrences (data=matrix)
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