Large daphniids are keystone species that link fish predation and phytoplankton in trophic cascades

Abstract

Daphniids act as keystone species in lake ecosystems by controlling phytoplankton biomass and experiencingintense fish predation. However, the importance of single daphniid species as trophic links betweenphytoplankton and fish remains unclear, especially compared with other zooplankton taxa. To disentangle the roleof individual zooplankton taxa in the food web of a large lake, we performed an in-situ mesocosm experiment withnatural phytoplankton and zooplankton communities in three treatments with native, invasive or no fish predators,respectively. A large daphniid, Daphnia longispina, was the zooplankter most strongly predated by both fish species,and also had the highest top-down effects on phytoplankton. All other zooplankton taxa, including a smalldaphniid species, had minor roles in terms of both predation by fish and grazing on phytoplankton. We suggest thatdaphniid species with large body sizes can strongly link higher and lower trophic