Fig. 1. (A) Time course of cumulative metamorphosis percent (ln scale) by the Kaplan–Meier analysis in B. gargarizans larvae exposed to control, 10, 50 and 100 mg/L NO3–N
concentrations. (B) Metamorphosis percent in B. gargarizans larvae exposed to control groups and different concentrations NO3–N (A10, A50, A100) at the end of the
experiment (on the 78th day). The data are presented as mean ± SE. Controls are denoted by C. ⁄ = Significantly different from control (p 6 0.05). ⁄⁄ = Highly significant
different from control (p 6 0.01).