Abstract:Analysis of bacterial diversity in soils along the banks of the Solimões and
Negro rivers, state of Amazonas, Brazil, was by partial sequencing of the genes codifying
the rDNA16S region. Diversity of operational taxonomic units (OTU) and of the divergent
sequences obtained were applied in comparative analysis of microbiological diversity in
the two environments, based on richness estimators and OTU diversity indices. The higher
OTU diversity in the Solimões was based on the higher number of parameters that
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