RiversFloodsWater MovementsBrazilCestodaWetlandsPopulation DensityFresh WaterGastrointestinal ContentsSeasonsFishesBiodiversityCladoceraOnagraceaeEcosystemRotiferaTrematodaPopulation DynamicsChironomidaeStomatognathic SystemPolygonumPhytoplanktonHuman ActivitiesLakesPlanktonFood ChainTreesSoil PollutantsGeologic SedimentsEnvironmental MonitoringBiomassConservation of Natural ResourcesGeographyLarva