FIG 4.

Effect of the indigenous species (A) and the trapping species (B) on Frankia community structure in soils and in the trapped nodules, illustrated by nonmetric multidimensional scaling (NMDS). NMDS were performed on Frankia OTU matrices computed from nifH sequences. Colors refer to the alder species, both on the field and in the trapping experiment. P values of permutational multivariate analysis of variance (adonis function) are given for both factors tested (A and B). Ellipses are graphical overviews.