Figure 1.

Galls on leaves of the creamy strawberry Fragaria viridis (a) induced by the mite Fragariocoptes setiger (b); mite collection localities, samples 1 and 2 (c); Bacterial taxonomic richness in samples 1 and 2, the number of unique bacterial genera in each sample and in their intersection is shown as a Venn diagram (d), k-mer-based taxonomic classification was done in Kraken using a normalized abundance threshold of ≥ 0.0338%; there was a total of 49,514,852 and 3,830,185 classified bacterial reads in samples 1 and 2, respectively; detailed taxonomic classification and abundance estimates are given in Supplementary Table S2 and visualized in Supplementary Fig. S1; abundance of bacterial genera in the intersection of samples 1 and 2 (e), abundance values are percentages of classified reads, while the heatmap colors are based on log₂-transformed abundance values. Maps were generated by modifying public domain maps in Adobe Illustrator CS6 (https://commons.wikimedia.org/wiki/File:Outline_Map_of_Northwestern_Federal_District.svg, Finland (orthographic projection).svg).