“…The presence of native forest in Andean zones of Araucania region (38°S) would be an important determinant of water quality in associated rivers and lakes (Pedrozo et al, 1993;De los Ríos-Escalante, 2010), that in consequence would affects the aquatic communities such as was observed for pelagial environment (De los Ríos-Escalante et al, 2012). There are not published information about benthic fauna in Araucania region (38°S) among river beds, only there are an inventory without site specifications of macroinvertebrate fauna in Cautin river (Vega et al, 2020), Crustacean in Tolten river (De los Rios-Escalante et al, in press) and descriptions of benthic macroinvertebrates as preys on native fishes in Tolten river (Barile et al, in press).…”