RiversRoss River virusFresh WaterWater MovementsWater Pollutants, ChemicalWater PollutionEnvironmental MonitoringFishesWater MicrobiologySeasonsWater QualityBrazilGeologic SedimentsFloodsPopulation DensityEcosystemWater Pollution, ChemicalCatfishesGeographyCyprinidaeBiodiversityTrematode InfectionsOttersPopulation DynamicsOnchocerciasis, OcularFish DiseasesWater SupplySewageSalmonSimuliidaeDolphinsFisheriesAlphavirus InfectionsPhylogenyConservation of Natural ResourcesAnimal MigrationPhytoplanktonInvertebrates