of rare representatives was likely to determinecluster differentiation. Rare taxa are not easily dispersed over
long distances, since their cells have a lower chance of moving
far from their origin or of establishing new populations
[33,34]. However, rare taxa, often considered K-strategists, are
crucial due to their specific metabolic properties, that is, a
piloting capacity at promoting metal biotransformation or
xenobiotic mineralization at low environmental concentrations.
Consequently, their detection is of considerable importance
for differentiation of land-use systems [35].