Data collection
To test the hypotheses, we used a database composed of 76 streams of
three distinct hydrographic regions of Brazil: (i) Araguaia-Tocantins;
(ii) Paraná; and (iii) São Francisco, with all streams located within
the Cerrado biome (Fig 1) and can be accessed in Vieira et al. (2020).
All sampled streams are first- to third-order, georeferenced; the
ichthyofauna was sampled by trawl or electric fishing at least along 50
m of the channel. The local environmental conditions measured were
turbidity, conductivity, pH, dissolved oxygen, water velocity, width and
depth channel (three measurements in each stream).
Fig 1. Location of the 76 sampled streams (points) in the three
hydrographic regions considered of the Brazilian Cerrado biome.