Hello everyone,
I am using non-metric multidimensional scaling and ordihull (package vegan)
to compare groups of sites in the environmental space defined by several
variables. I would like to quantify percentages of the environmental space
shared and not-shared by each group of sites using the convex polygons
created by ordihull as a Venn diagram. I have three questions.

1. Is this a legitimate way to interpret environmental space in NMDS?

2. It is relatively straightforward to do this by exporting the plots and
using a program such as imageJ to circumscribe the polygons and calculate
shared areas but is there a way to do this in R for an R novice?

3. Unfortunately a few ordinations are solved best with 3 dimensions, there
isn't a way to calculate areas of convex polygon "spheres" using the  two
dimensional plots. Could the calculation of shared space by the 3D spheres
be done in R?

Thanks for your time and help.
Eric

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