"tributary","species.upstream","species.downstream"
"Ica",14,19
"Jutai",11,18
"Japura",8,8
"Coari",5,7
"Purus",10,16
"Manacapuru",5,6
"Negro",23,24
"Madeira",29,30
"Trombetas",19,16
"Tapajos",16,20
"Xingu",25,21
"Tocantins",10,12
