ade4 (version 1.7-22)

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 :

fau

: a data frame with 70 rows (sites) and 35 columns (Oribatid species)

envir

: a data frame with 70 rows (sites) and 5 columns (environmental variables)

xy

: a data frame that contains spatial coordinates of the 70 sites

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