ade4 (version 1.6-2)

aravo: Distribution of Alpine plants in Aravo (Valloire, France)

Description

This dataset describe the distribution of 82 species of Alpine plants in 75 sites. Species traits and environmental variables are also measured.

Usage

data(aravo)

source

Choler, P. (2005) Consistent shifts in Alpine plant traits along a mesotopographical gradient. Arctic, Antarctic, and Alpine Research, 37,444--453.

Details

The environmental variables are: lll{ Aspect Relative south aspect (opposite of the sine of aspect with flat coded 0) / Slope Slope inclination (degrees) / Form Microtopographic landform index 1 (convexity); 2 (convex slope); 3 (right slope); 4 (concave slope); 5 (concavity) Snow Mean snowmelt date (Julian day) averaged over 1997-1999 / PhysD Physical disturbance, i.e., percentage of unvegetated soil due to physical processes / ZoogD Zoogenic disturbance, i.e., quantity of unvegetated soil due to marmot activity no; some; high } The species traits for the plants are: ll{ Height Vegetative height (cm) Spread Maximum lateral spread of clonal plants (cm) Angle Leaf elevation angle estimated at the middle of the lamina Area Area of a single leaf Thick Maximum thickness of a leaf cross section (avoiding the midrib) SLA Specific leaf area Nmass Mass-based leaf nitrogen content Seed Seed mass }

Examples

data(aravo)
   coa1 <- dudi.coa(aravo$spe, scannf = FALSE, nf = 2)
   dudienv <- dudi.hillsmith(aravo$env, scannf = FALSE, nf = 2, row.w = coa1$lw)
   duditrait <- dudi.pca(aravo$traits, scannf = FALSE, nf = 2, row.w = coa1$cw)
   rlq1 <- rlq(dudienv, coa1, duditrait, scannf = FALSE, nf = 2)
   plot(rlq1)