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...trics for each species in the area of overlap and in areas where neither species occurs.  I've taken a look at the dune and dune.env datasets in vegan. Using the str() command gives me  > str(dune) 'data.frame':   20 obs. of  30 variables:  $ Belper: num  3 0 2 0 0 0 0 2 0 0 ...  $ Empnig: num  0 0 0 0 0 0 0 0 0 0 ...  $ Junbuf: num  0 3 0 0 0 0 0 0 0 0 ...  $ Junart: num  0 0 0 3 0 0 4 0 0 3 ...  ... However, when I try looking directly at the data frame using the edit command I see that there is a column called "row.names" to the left of "Belper". Likewise, w...