Fig. 2

a Heatmap shows hierarchical clustering of taxa (relative abundance ≥1.0 % of the analyzed sequences). The scale bar represents color saturation gradient based on the relative abundances of the bacterial genera. The dendrogram at the top shows the weighted Euclidean distance analysis of community similarity. Classification is presented at the genus and phylum levels. b PCA of bacterial communities based on the relative abundances (≥2.3 %) of selected genera. The vectors indicate the direction and impact of each genus on the overall variance. R squared (r²) = 0.49. MCG8 Microcerotermes sp. gut homogenate, MIG7 Microtermes sp. gut homogenate, OTG1 Odontotermes sp. gut homogenate, MTG4 M. michaelseni gut homogenate, OTN2 soil from mound C of Odontotermes sp., MTN5 soil from mound D of M. michaelseni, MTS6 soil collected 3 m away from mound D, OTS3 soil collected 3 m away from mound C