Log gene copy number (<i>y</i> axis) of (a) 16S rRNA and (b) <i>bph</i> genes across the studied sites.

<p>Sites are indicated in the <i>x</i> axis. Error bars represent the standard deviation of three independent replicates. ADE = Amazon Dark Earth; ADJ = Adjacent soils; SF = Secondary Forest; M = Manioc cultivation. Different upper case letters refer to differences for the 16S rRNA across sites; while different lower case letters refer to differences for the <i>bph</i> gene (<i>P</i><0.01, Tukey test).