Oribatid Mite Data with Explanatory Variables
Oribatid mite data. 70 soil cores collected by Daniel Borcard in 1989. See Borcard et al. (1992, 1994) for details.
data(mite) data(mite.env) data(mite.pcnm) data(mite.xy)
There are three linked data sets: mite that contains the data
on 35 species of Oribatid mites, mite.env that contains
environmental data in the same sampling sites, mite.xy
that contains geographic coordinates, and mite.pcnm
that contains 22 PCNM base functions (columns) computed from the geographic
coordinates of the 70 sampling sites (Borcard & Legendre 2002).
The whole sampling area was 2.5 m x 10 m in size.
The fields in the environmental data are:
Substrate density (g/L)
Water content of the substrate (g/L)
Substrate type, factor with levels Sphagn1,
Sphagn2 Sphagn3 Sphagn Litter Barepeat Interface
Shrub density, an ordered factor with levels 1 <
2 < 3
Microtopography, a factor with levels Blanket and Hummock
Pierre Legendre
Borcard, D., P. Legendre and P. Drapeau. 1992. Partialling out the spatial component of ecological variation. Ecology 73: 1045-1055.
Borcard, D. and P. Legendre. 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. and P. Legendre. 2002. All-scale spatial analysis of ecological data by means of principal coordinates of neighbour matrices. Ecological Modelling 153: 51-68.
data(mite)
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