Before revision: + Average physico-chemical characteristics Juruá River (typical whitewater) Tapajós River (typical clearwater) Tefé River (typical blackwater) pH 7.27 6.56 5.03 Electric conductivity (μS/cm) 191.14 14.33 7.36 Total suspended solids (mg/L) 51.42 10.56 7.90 Ca (mg/L) 32.55 0.52 0.71 Mn (mg/L) 4.42 0.26 0.22 Na (mg/L) 10.19 1.50 0.40 K (mg/L) 1.98 0.93 1.41 Total P (mg/L) 0.080 0.010 0.033 (mg/L) 106.14 8.80 6.86 (mg/L) 0.031 0.040 0.014 (mg/L) 0.062 0.19 0.13 Total N (mg/L) 0.39 0.35 0.24 (mg/L) 2.56 0.30 4.20 Colour (mg/Pt/L) 41.61 4.02 54.90 Si (mg/L) 5.78 5.25 0.33 Cl (mg/L) 4.75 0.53 0.85 Ecology The zebra pleco is one of the many species, including several other catfish, that are restricted to clearwater rivers and threatened by dams The difference in chemistry and visibility between the various black, white and clearwater rivers result in distinct differences in flora and fauna.
After revision: + Average physico-chemical characteristics Juruá River (typical whitewater) Tapajós River (typical clearwater) Tefé River (typical blackwater) pH 7.27 6.56 5.03 Electric conductivity (μS/cm) 191.14 14.33 7.36 Total suspended solids (mg/L) 51.42 10.56 7.90 Ca (mg/L) 32.55 0.52 0.71 Mg (mg/L) 4.42 0.26 0.22 Na (mg/L) 10.19 1.50 0.40 K (mg/L) 1.98 0.93 1.41 Total P (mg/L) 0.080 0.010 0.033 (mg/L) 106.14 8.80 6.86 (mg/L) 0.031 0.040 0.014 (mg/L) 0.062 0.19 0.13 Total N (mg/L) 0.39 0.35 0.24 (mg/L) 2.56 0.30 4.20 Colour (mg/Pt/L) 41.61 4.02 54.90 Si (mg/L) 5.78 5.25 0.33 Cl (mg/L) 4.75 0.53 0.85 Ecology The zebra pleco is one of the many species, including several other catfish, that are restricted to clearwater rivers and threatened by dams The difference in chemistry and visibility between the various black, white and clearwater rivers result in distinct differences in flora and fauna.