FIGURE 3.

Taxonomic tree of the bacterial strains isolated from Saint Donatus statue. The node sizes reflect the microorganisms’ abundance. The annotations above the terminal nodes of the tree indicate the isolation location on the statue: N (North), S (South), E (East), W (West), U (Upper part), and L (Lower part). The first external circle shows the Gram coloration results, while the second one (with yellow boxes) highlights the bacteria capable of CaCO₃ precipitation. The number within the first clade marker represents the total number of isolated bacterial strains that received taxonomic identification.