[R-sig-eco] Bringing ordispider labels to the front of plot and decluttering

[Thomas Parr]

I have the following code that creates an ordispider plot (adapted from:
http://r.789695.n4.nabble.com/Plotting-Ellipses-and-Points-of-Matching-Color
s-in-an-Ordination-td3731968.html). However, due to the plotting order in
the code the lines for HF fall atop the label for BF. How would I adjust
this so the labels are added after all the lines are added? Also, let's
assume the labels overlap.  Is there a simple way to declutter the labels?

data(dune) 
data(dune.env) 
mod <- cca(dune ~ Management, dune.env) 
attach(dune.env) 
plot(mod, type="n") 
points(mod, display="sites", pch=as.numeric(Management),
col=as.numeric(Management)) 
groupz <- sort(unique(Management)) 
for(i in seq(groupz)) { 
  ordispider(mod, Management,label=T, font=2, cex=1.5, col=i,
show.groups=groupz[i])
}


Thanks,

Thomas