BTW the fully reproducible code and the data can be found here:

entrepot.recherche.data.gouv.fr/dataset.xhtm...

We are also working on R package that will be availble soon!

Congrats! I jumped to comment on your great Plant&Soil paper to mention that it is key to evaluate myco colonization in collaboration gradient, which you agreed. Yet, this one does not use myco colonization but infers the collaboration gradient. There is variation in diameter regardless of myco too