top-down control Phytoplankton 8 bottom-up control 8 lake ecosystem 8 phytoplankton 8 Top-down 6 abundance 6 environmental factor 6 food web 6 temporal variation 6 Animals 4 Antarctica 4 Argentina 4 Bottom-up 4 Cyanobacteria 4 Northern Hemisphere 4 Shallow lakes 4 Top-down control 4 algae 4 biomass 4 cyanobacterium 4 experimental study 4 peatland 4 picoplankton 4 plankton 4 zooplankton 4 Tierra del Fuego [(ARC) South America] 3 Algae control 2 Anoxia 2 Anoxic conditions 2