“…Certain squamates (Machado et al, 2014;Fonseca et al, 2018), frogs (Oliveira et al, 2018a;Thomé et al, 2021a), birds (Corbett et al, 2020), insects (Andrade-Souza et al, 2017), and plants (Balbino et al, 2018) exhibit no genetic break totally concordant with the SFR. On the other hand, concordant genetic breaks indicate that the river clearly structures other lizards (Passoni et al, 2008;Siedchlag et al, 2010;Werneck et al, 2012;Almeida et al, 2020), frogs (Bruschi et al, 2019), mammals (Nascimento et al, 2011;Faria et al, 2013;Fegies et al, 2021), fishes (Costa et al, 2018), and plants (Menezes et al, 2016). Meanwhile, the SFR acts merely as a soft barrier for certain species, contributing to fine interpopulation structure while allowing gene flow across its margins (Werneck et al, 2015;Miranda et al, 2016;Oliveira et al, 2018b;Lanna et al, 2020;Thomé et al, 2021b).…”