Table 1. Summary statistics of 72 h LC50 values (mS/cm) estimated from Kaplan-Meier functions for the different regions and various taxa.
| Range | Mean (95%CI) | Median (95%CI) | HC1 | HC5 | HC10 | HC20 | n –point & interval | n - right censored | n - total | |
| E Australia | 5.5−77.5 | 33.3a (30.1−36.6) | 32.5 (28.2−36.8) | 6.2 | 10.4 | 13.8 | 16.4 | 106 | 100 | 206 |
| France | 2.2−57.3 | 22.3b (19.5−25.0) | 18.8 (16.6−21.0) | 2.2 | 4.7 | 7.3 | 11.8 | 89 | 3 | 92 |
| Israel | 3.8−50.0 | 24.9b (19.5−26.6) | 22.8 (16.3−29.3) | <3.8 | 3.8−8 | 8.0−10.3 | 11.8−12 | 29 | 0 | 29 |
| S Africa | 10.8−47 | 31.4a (27.5−35.2) | 35.0 (30.7−39.2) | <10.8 | 10.8−11 | 11−12.6 | 16.0 | 24 | 26 | 50 |
| Rare | 2.2−77.5 | 33.6a (30.6−36.5) | 32.5 (29.3−35.7) | 2.3 | 9.5−10.8 | 12.8−13.3 | 16.4 | 132 | 129 | 261 |
| Abundant | 3.8−52 | 22.3b (29.2−24.4) | 19.0 (17.7−22.1) | 3.8 | 6.5 | 9.3−10 | 11.9 | 116 | 116 | 0 |
| Crustaceans | 11−77.5 | 39.6a (32.9−49.3) | 40.5 (30.1−51.0) | <11 | 11−13.5 | 14.8 | 21−24 | 25 | 6 | 31 |
| Insects &Hydracarina | 2.1−57.3 | 29.1b (27.3−30.9) | 28 (25.8−32.0) | 3.3 | 8.4 | 12.6 | 14.6 | 187 | 114 | 301 |
| Non-arthropods | 4.6−37.9 | 15.6b (13.2−18.0) | 13.8 (11.7−15.9) | <4.7 | 6.5 | 9.0 | 10.8 | 36 | 9 | 45 |
| Annelids | 9.3−17.5 | 13.7a (11.7−15.6) | 13.8 (11.2−16.4) | <9.3 | <9.3 | <9.3 | 9.3−11.4 | 8 | 1 | 9 |
| Insects | 2.2−57.2 | 29.0b (27.2−30.9) | 28.9 (25.6−32.2) | 3.3 | 8.4 | 12.5 | 15.0 | 177 | 107 | 284 |
| Hydracarina | 19.3−45.0 | 30.1b (25.2−34.9) | 29.1 (24.6−33.6) | <19.3 | <19.3 | 19.3−20.9 | 20.9−21.5 | 10 | 7 | 17 |
| Molluscs | 4.6−37.9 | 17.2a (13.6−20.7) | 13.8 (10.2−17.4) | <4.6 | 4.6−6.5 | 9.0 | 10.8 | 22 | 8 | 30 |
| Turbellaria | 8−14.4 | 11.9a (10.0−13.8) | 11.6 (9.9−13.3) | <8.0 | <8.0 | <8.8 | 8.0−10.0 | 6 | 0 | 6 |
| Coleoptera | 13.6−53.5 | 38.0a (34.2−41.7) | 40.2 (36.0−44.4) | <13.6 | 17.6 | 18.8 | 23.4 | 29 | 36 | 65 |
| Diptera | 7.8−57.2 | 25.0b (19.0−31.0) | 21.1 (17.5−24.7) | <7.8 | 7.8−8.0 | 8.0−10.0 | 14.7 | 19 | 13 | 32 |
| Ephemeroptera | 2.4−>20 | 12.0c (10.2−13.7) | 12.8 (12.0−13.6) | <2.4 | 2.4−3.3 | 3.8−4.8 | 6.2−6.8 | 27 | 9 | 36 |
| Hemiptera | 10.8−>51 | 27.5b (23.8−31.2) | 25.3 (23.3−27.3) | <10.8 | 10.8−12.4 | 14.0−15.0 | 17.5−18.4 | 27 | 12 | 39 |
| Lepidoptera | 18.0−24.3* | 1 | 0 | 1 | ||||||
| Megaloptera | 41.6 | 1 | 0 | 1 | ||||||
| Odonata | 12.6−55 | 38.0a (35.3−40.7) | 36.3 (30.0−42.6) | <12.6 | 21−27.5 | 29.5−30 | 30.3 | 32 | 24 | 56 |
| Plecoptera | 9.1−36.7 | 21.5b (14.4−28.6) | 18.3 (17.3−19.3) | <9.1 | <9.1 | <9.1 | 9.1−12.6 | 9 | 2 | 45 |
| Trichoptera | 2.2−32.0 | 19.6b (17.5−21.8) | 19.1 (17.2−21.1) | <2.2 | 8.4 | 11.8 | 14.4 | 34 | 11 | 45 |
| Overall | 2.2−77.5 | 28.9 (27.1−30.8) | 27.0 (24.3−29.7) | 3.0 | 8.2 | 11.2 | 13.9 | 248 | 129 | 377 |
HCp is the estimated hazardous concentration (in terms of 72 h LC50 values) for p% of species tested and n is the number of samples. Mean values with the same letter are not statistically significant different from each other at the 0.05 level.
*
Single species with an interval estimate of its LC50 value.