Temporal trends in FBI metrics annual median values across sites for REPNET and REFNET. Solid regression lines indicate that the Mann-Kendall trend test is significant at the 5% threshold. It is worth noting that while all metrics but one (i.e., “nb_lithophilic_sp”) show temporal tendencies toward degradation for REFNET, four metrics (i.e., “total_nb_sp”, ”nb_rheophilic_sp”, “nb_lithophilic_sp” and “dens_invertivorous_indiv”) show slight temporal trends toward amelioration for REPNET (although these last trends are not statistically significant).