ade4 (version 1.7-5)

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)

Format

aravo is a list containing the following objects :

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:

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

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

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)