ade4 (version 1.7-5)

oribatid: Oribatid mite

Description

This data set contains informations about environmental control and spatial structure in ecological communities of Oribatid mites.

Usage

data(oribatid)

Format

oribatid is a list containing the following objects :

Source

Data prepared by P. Legendre and D. Borcard starting from http://www.fas.umontreal.ca/biol/casgrain/fr/labo/oribates.html

Details

Variables of oribatid$envir are the following ones : substrate: a factor with seven levels that describes the nature of the substratum shrubs: a factor with three levels that describes the absence/presence of shrubs topo: a factor with two levels that describes the microtopography density: substratum density ($g.L^-1$) water: water content of the substratum ($g.L^-1$)

References

Borcard, D., and Legendre, P. (1994) Environmental control and spatial structure in ecological communities: an example using Oribatid mites (Acari Oribatei). Environmental and Ecological Statistics, 1, 37--61.

Borcard, D., Legendre, P., and Drapeau, P. (1992) Partialling out the spatial component of ecological variation. Ecology, 73, 1045--1055.

See a data description at http://pbil.univ-lyon1.fr/R/pdf/pps039.pdf (in French).

Examples

data(oribatid)
ori.xy <- oribatid$xy[, c(2, 1)]
names(ori.xy) <- c("x","y")
plot(ori.xy,pch = 20, cex = 2, asp = 1)

if(requireNamespace("deldir", quiet = TRUE)) {
  if(requireNamespace("spdep", quiet = TRUE)) {
    plot(deldir(ori.xy), add = TRUE)
    if(adegraphicsLoaded()) {
      s.label(ori.xy, nb = knn2nb(knearneigh(as.matrix(ori.xy), 3)), plab.cex = 0)
    } else {
      s.label(ori.xy, add.p = TRUE, neig = nb2neig(knn2nb(knearneigh(as.matrix(ori.xy), 3))),
        clab = 0)
    }
  }
}