Figure 1.

Results of the 21-d chronic D. magna test for (a) amoxicillin, (b) enrofloxacin, and (c) neomycin. The results are shown as mean ± standard deviation (n = 10). The Asterisk (*) denotes a significant difference in the observation endpoint from that of the control (p < 0.05). Monotonous trend was assumed for statistical analysis of the growth of D. magna following exposure to enrofloxacin (b). Nominal concentration was used for enrofloxacin (b). β, slope; r², coefficient of determination; p, probability value.