Table A4.
Critical thermal minima (CTmin), critical thermal maxima (CTmax), thermal range of tolerance and thermal window (TW) (±SD) of tadpoles of the African clawed frog Xenopus laevis at five different temperatures during development exposed at different TH levels. T4 = high TH levels; SP = low TH levels. Regression slopes show the increase of CTmin and CTmax for every 1°C increase in Tdev. Bold for mean values
| Developmental temperature (°C) | Treatment | CTmin (°C) ±SD | CTmax (°C) ±SD | Thermal range of tolerance ±SD | TW (°C2) | Regression slope CTmin (R2) | Regression slope CTmax (R2) |
|---|---|---|---|---|---|---|---|
| 16 | Control | 5.5 ± 0.4 | 35.1 ± 0.8 | 29.6 ± 0.4 | 290.76 | Y = 0.98x−11.28 (0.891) | Y = 0.31x+28.04 (0.161) |
| 19 | 7.3 ± 0.1 | 31.5 ± 0.5 | 24.1 ± 0.3 | ||||
| 22 | 8.4 ± 0.1 | 31.6 ± 0.3 | 23.1 ± 0.8 | ||||
| 25 | 14.2 ± 0.2 | 39.7 ± 0.2 | 25.5 ± 0.5 | ||||
| 28 | 16.9 ± 0.1 | 35.5 ± 0.5 | 18.5 ± 0.4 | ||||
| 16 | SP | 4.2 ± 0.7 | 34.3 ± 0.6 | 30.1 ± 0.3 | 297.85 | Y = 0.96x−10.66 (0.893) | Y = 0.28x+28.58 (0.122) |
| 19 | 7.1 ± 0.9 | 30.9 ± 0.1 | 23.8 ± 0.6 | ||||
| 22 | 7.8 ± 0.1 | 30.8 ± 0.1 | 23 ± 0.5 | ||||
| 25 | 13.1 ± 0.8 | 39.0 ± 0.5 | 25.8 ± 0.6 | ||||
| 28 | 15.1 ± 0.4 | 34.8 ± 0.1 | 19.7 ± 0.7 | ||||
| 16 | T4 | 6.5 ± 0.5 | 35.9 ± 1.1 | 29.4 ± 1.1 | 292.875 | Y = 0.95x−10.68 (0.907) | Y = 0.27x+28.77 (0.124) |
| 19 | 7.9 ± 0.5 | 32.7 ± 0.2 | 24.8 ± 0.1 | ||||
| 22 | 8.5 ± 0.5 | 33.1 ± 0.9 | 24.5 ± 0.4 | ||||
| 25 | 15 ± 0.5 | 41.1 ± 0.3 | 26.1 ± 0.3 | ||||
| 28 | 17.7 ± 0.7 | 35.8 ± 0.1 | 18.1 ± 1.9 |