Distribution of Alpine plants in Aravo (Valloire, France)
This dataset describe the distribution of 82 species of Alpine plants in 75 sites. Species traits and environmental variables are also measured.
data(aravo)
aravo is a list containing the following objects :
is a data.frame with the abundance values of 82 species (columns) in 75 sites (rows).
is a data.frame with the measurements of 6 environmental variables for the sites.
is data.frame with the measurements of 8 traits for the species.
is a vector with full species names.
The environmental variables are:
| 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:
| 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 |
Choler, P. (2005) Consistent shifts in Alpine plant traits along a mesotopographical gradient. Arctic, Antarctic, and Alpine Research, 37,444–453.
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)
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