Longitudinal changes on ecological diversity of Neotropical fish along a 1700 km river gradient show declines induced by dams Anahí López-Rodríguez; Mariana Meerhoff; Alejandro D¿Anatro; Sunshine de Ávila-Simas; Ivana Silva; Joaquín Pais; Franco Teixeira de Mello; David Augusto Reynalte-Tataje; Evoy Zaniboni-Filho; Iván González-Bergonzoni;