oribatid {ade4} | R Documentation |
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$envir
are the following ones :
substrate: a factor with seven levels that describes the nature of the substratum
shrubs: a factor with three levels that describes the absence/presence of shrubs
topo: a factor with two levels that describes the microtopography
density: substratum density (g.L^{-1}
)
water: water content of the substratum (g.L^{-1}
)
Source
Data prepared by P. Legendre Pierre.Legendre@umontreal.ca and D. Borcard borcardd@magellan.umontreal.ca
References
Borcard, D., and Legendre, P. (1994) Environmental control and spatial structure in ecological communities: an example using Oribatid mites (Acari Oribatei). Environmental and Ecological Statistics, 1, 37–61.
Borcard, D., Legendre, P., and Drapeau, P. (1992) Partialling out the spatial component of ecological variation. Ecology, 73, 1045–1055.
See a data description at http://pbil.univ-lyon1.fr/R/pdf/pps039.pdf (in French).
Examples
data(oribatid)
ori.xy <- oribatid$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))))
}
}