Figure 2. Population demography of Daphnia magna based on body length measured before (white bars) and after (black bars) the first (left) and second (right) p353-nonylphenol pulse exposure period; bars represent mean and standard deviation of three replicates in a control (a) and three different treatments: (b) predation by Notonecta maculata juveniles, (c) exposure to nonylpenol, and (d) a combination of both nonylphenol exposure and predation.