Summarized information of denaturing gradient gel electrophoresis (DGGE) profiles in the present study.

aShannon index of general diversity (H) as described by Tiwar et al. [23].bThe indice (E) to evaluate the evenness of microbial structure as calculated by Pielou [24].cBased on the Pareto principle, the cumulative y axis value (in this case the proportion of intensities) corresponding with the 20% level on the x axis (in this case the cumulative proportion of band numbers) (20%PL Evenness) used to evaluate the Lorenz curves by Wittebolle et al. [25].dRichness (S) of the bacterial and archaeal communities as described by Chau et al. [26], which is the number unique taxa present in the sample (here represented by the number of bands in the DGGE lanes).