The dynamics and relative strength of bottom-up vs top-down impacts in a community of subtropical lake plankton [food web theory, Piona, piscivore biomass]

acarina argentina argentine biomasa biomass biomasse clima subtropical climat subtropical depredadores fitoplancton freshwater ecology herbivore herbivores lac lagos lakes phytoplancton phytoplankton predators seasonal variation subtropical climate temps tiempo time zooplancton zooplankton