I want to test if there are diferences in species composition between groups in a large dataset (25k observations). I have the relative weight of 200 species divided into 30 groups. I don't need to specificaly know which species are different (no need for post-hoc test). Here is an example of a row:

Obs Group Species Relative Weight (kg/total weight of Obs)

1 Alpha A 0.68

I casted the data and tried using vegdist but it was too heavy to perform.