Table 2 Frequency of Frankia sub-clades occurring in clones
derived from Alnus tenuifolia rhizosphere soils in early (denseAlnus tenuifolia stands) or late succession (mature Picea
glauca forests), or in areas lacking A. tenuifolia in late
succession forests. P-values in bottom rows were derived from Fisher’s
exact test conducted for pairwise comparisons of a priori interest.