The effects of a temperature shock on zooplankton

Summary Exposure of 4–5 day oldDaphnia hyalina to temperatures of 32° C and higher caused substantial mortality when the exposure time was an hour or more. The tolerance ofBosmina sp. to temperature shocks appears to be about that ofD. hyalina. Naupllus larvae ofCyclops sp. were much more tolerant.Survival and reproduction ofD. hyalina at high temperatures were strongly influenced by the food concentration. In a high food concentration the reproduction is at 28° C as high as at 20° C.