“…Thus, HC probably act as a filter selecting the organisms that are able to survive and establish in this specific condition (Bordenave et al, 2004;Duran et al, 2015;Stauffert et al, 2013). However, the functional microbial communities structure was not affected by the spiking of HC (PERMANOVA F(1) = 1.0825; p > 0.05) suggesting a legacy effect (Jurburg et al, 2017;Nunes et al, 2018;Hafez et al, 2022). Additionally, NMDS analysis separated clusters according to the compartment, distinguishing the effect of runoff in sediments (Figure 2), which indicated functional redundancy, similar function carried by different genes and/or species (Jurburg and Salles, 2015;Louca et al, 2018), as illustrated in Figure 2 B for the organic remediation function.…”