Table 2.
EC50 values following copper exposure in the four species of tardigrades.
| Species | EC50, 2 h (μg l−1) | EC50, 24 h (μg l−1) | EC50, 48 h (μg l−1) |
|---|---|---|---|
| E. sigismundi | 237 (228–240); r2 = 0.99 |
178 (168–186); r2 = 0.99 |
185 (177–192); r2 = 1.00 |
| E. testudo | N/A; r2 = 0.56 | N/A; r2 = 0.65 | N/A; r2 = 0.55 |
| R. oberhaeuseri | 365 (343–401); r2 = 0.98 |
310 (295–328); r2 = 0.99 |
260 (233–284); r2 = 0.97 |
| H. crispae (P1) | N/A; r2 = 0.18 | N/A; r2 = 0.59 | N/A; r2 = 0.75 |
EC50 values indicating the predicted concentration of copper necessary to abolish 50% of activity (95% confidence intervals in parentheses) at the given time point following copper exposure. r2 values were derived from dose-response regression analyses. N/A, not applicable.