RiversRoss River virusFresh WaterWater MovementsWater Pollutants, ChemicalWater PollutionEnvironmental MonitoringWater MicrobiologyFishesWater QualityEcosystemSeasonsWater Pollution, ChemicalGeologic SedimentsBrazilPopulation DensityBiodiversityFloodsCatfishesInvertebratesGeographyCyprinidaePopulation DynamicsSewageSalmonWater SupplyTrematode InfectionsOttersFish DiseasesSimuliidaeConservation of Natural ResourcesOnchocerciasis, OcularPhylogenyFisheriesBiomassAnimal MigrationLakesIndustrial WasteDolphinsMetals, HeavyEutrophicationHydrologyWetlandsTreesAlphavirus InfectionsGastrointestinal ContentsEukaryotaRainBacteriaTrematodaPhytoplankton