A data set containing information on the microfauna of 70 sites located within the the peat on shore of Lac Geai, a bog lake located at the Station de Biologie de l'Université de Montréal, St-Hippolyte, QC, Canada (+45.9954; -73.9936).
MiteContains three matrices:
mite.species the abundance of 35 morpho-species of oribatid
mites (Acari).
mite.env 14 environmental variables (quantitative and binary).
mite.geo the relative coordinates of the samples.
Values in mite.species are counts of individuals of each of the
morpho-species obtained from 5 cm diameter cores going from the
surface of the peat down to a depth of 7 cm. See Bordard & Legendre
(1994) and reference therein for details about sample treatment and
species identification.
mite.env contains two quantitative variables, namely the
substratum density (g/L) and water content (percent wet mass over dry
mass), in addition to 12 dummy variables. The first seven represent
the composition of the substratum: Sphagnum magellacinum (with
a majority of S. rubellum), S. rubellum,
S. nemorum, (with a majority of S. augustifollium),
S. rubellum + S. magellicum (in equal proportions),
lignous litter, bare peat, and interface between Sphagnum
species. The next three dummy variables represent the presence and
abundance of shrubs (Kalmia polifolia, K. angustifolia,
and Rhododentron groenlandicum): none, few, and many. The last
two dummy variables represent the microtopography of the peat: blanket
(flat) or hummock (raised).
mite.geo contains the location of the samples, in meters, with
respect to the sampling grid. Point (0,0) is the lower left end of the
plot for an observer looking from the shore towards the water. The
x coordinate is the offset along the shore (from left to right)
while the y coordinate is the offset from the shore while
moving towards the water (See Borcard & Legendre, 1994, Fig. 1 for
details on the sampling area).
Borcard, D. & Legendre, P. 1994. Environmental control and spatial structure in ecological communities: an example using Oribatid mites (Acari, Oribatei). Environ. Ecol. Stat. 1: 37-61
Borcard, D.; P. Legendre & P. Drapeau. 1992. Partialling out the spatial component of ecological variation. Ecology 73: 1045-1055
Legendre, P. 2005. Species associations: the Kendall coefficient of concordance revisited. Journal of Agricultural, Biological and Environmental Statistics 10: 226-245
Borcard, D.; Gillet, F. & Legendre, P. 2011. Numerical Ecology with R. Springer, New-York, NY, USA.
data(Mite)
summary(mite.species)
summary(mite.env)
summary(mite.geo)
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