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. 2017 Jan 12;7:40385. doi: 10.1038/srep40385

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Heartbeat rates (means ± s.d., n = 5) of Daphnia magna individuals after 4 (A) and 12 h (B) of exposure to four norfloxacin concentrations (0, 25, 50 and 100 mg L⁻¹). Differences between mean heartbeat rates at the 4^th and 12^th h of the experiment were assessed by one-way analysis of variance (ANOVA) and one-way analysis of covariance (ANCOVA), respectively, followed by Tukey’s post hoc tests. Different letters indicate significant differences among norfloxacin concentrations (P < 0.05). Figure 2 was produced in Microsoft Excel 2016.