The effect of temperature and predation on performance in monoculture and in competition in three <scp>Daphniidae</scp> differing in body size

Zooplankton body size shows a strong association with temperature, competition, and predation. Global warming affects all three drivers of is thus expected to lead substantial changes in zooplankton community composition distributions. To disentangle the isolated joint effect fish predation on species biomass zooplankton, we monitored population biomasses Daphniidae that differ (Daphnia magna, Daphnia pulex, Ceriodaphnia reticulata) for 20 days, manipulating competition (monoculture, pairwise trials, three-species communities), temperature (20°C, 24°C, 28°C) presence or absence In predation, D. magna dominated experiments, even at high temperatures. went extinct, however, treatments 24°C 28°C. pulex outcompeted C. reticulata was negatively affected by temperature. did not reduce temperatures but positively Our results indicate two larger-bodied are more combination than smallest species. While higher reduced species, it fundamentally change their ability dominate over competition. The combined changed fundamentally, resulting dominance small-bodied This can have important ecosystem-wide impacts, such as transition turbid, algae-dominated systems.