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.
Shrub density, an ordered factor with levels 1 <
2 < 3
Topo
Microtopograhy, a factor with levels Blanket and Hummock
Source
Pierre Legendre
References
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.