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The ade4 Package - NexTag Supports Open Source Initiatives

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originality 183<br />

Details<br />

Variables of oribatid$envir are the following ones :<br />

substrate: a factor with seven levels that describes the nature of the substratum<br />

shrubs: a factor with three levels that describes the absence/presence of shrubs<br />

topo: a factor with two levels that describes the microtopography<br />

density: substratum density (g.L −1 )<br />

water: water content of the substratum (g.L −1 )<br />

<strong>Source</strong><br />

Data prepared by P. Legendre 〈Pierre.Legendre@umontreal.ca〉 and<br />

D. Borcard 〈borcardd@magellan.umontreal.ca〉 starting from<br />

http://www.fas.umontreal.ca/biol/casgrain/fr/labo/oribates.html<br />

References<br />

Borcard, D., and Legendre, P. (1994) Environmental control and spatial structure in ecological<br />

communities: an example using Oribatid mites (Acari Oribatei). Environmental and Ecological<br />

Statistics, 1, 37–61.<br />

Borcard, D., Legendre, P., and Drapeau, P. (1992) Partialling out the spatial component of ecological<br />

variation. Ecology, 73, 1045–1055.<br />

See a data description at http://pbil.univ-lyon1.fr/R/pps/pps039.pdf (in French).<br />

Examples<br />

data(oribatid)<br />

ori.xy

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