aravo | R Documentation |
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 :
spe
is a data.frame with the abundance values of 82 species (columns) in 75 sites (rows).
env
is a data.frame with the measurements of 6 environmental variables for the sites.
traits
is data.frame with the measurements of 8 traits for the species.
spe.names
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.
Dray S, Dufour A (2007). The ade4 Package: Implementing the Duality Diagram for Ecologists. Journal of Statistical Software, 22(4), 1-20. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.18637/jss.v022.i04")}.
data(aravo, package="jSDM")
summary(aravo)
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