Add indval values on a multivariate regression tree

Question

I used the mvpart package in R to generate a multivariate regression tree. To determine the indicator species responsible for the split, I used the indval command in the labdsv package.

My question is, how do I insert my indicator species into my regression tree?

Here is the script I used,

mvpart (Regression Tree)

mfish <- mvpart(as.matrix(fisheries.hell[, 2:34]) ~ Time + 
              Fishing.gear +
              Fishing.vessel + Fishing.ground +
              Fishing.hours + Fishing.days, fisheries.wide,
              method="mrt", xv="pick", which="4",
              xvmult=100, bars=FALSE) 

indval

mfish.indval$indcls[which(mfish.indval$pval <= 0.05)]