Physical factors 10 environmental factor 8 Cyanobacteria 6 biomass 6 phytoplankton 6 Argentina 4 Climate variables 4 Euglenida 4 Functional groups 4 Hydrological conditions 4 Latitudinal gradient 4 Potamoplankton 4 Rivers 4 Salado River 4 Spartina 4 Tidal salt-marshes 4 alga 4 algae 4 amplitude 4 biodiversity 4 dominance 4 environmental conditions 4 environmental effect 4 environmental gradient 4 functional group 4 grass 4 hydrological cycle 4 inflow 4 landscape 4 latitudinal gradient 4