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