Data obtained from the statistical analyses of clone libraries.

aThe clone libraries are denoted as: letters d, e and f (representing the alkB-targeting primers as described in Table 1), followed by the sampling site codes sI, sR, sY (three uncontaminated (pristine) soil samples) and s3 (one diesel contaminated soil sample) from King George Island, Antarctica (Fig. S1) and sC (oil-contaminated soil) from Carmópolis.bSpecies richness [28];cConfidence intervals [46];dSpecies richness [47];eShannon’s diversity index (H’) [29];fBoneh estimator [31].