a clear trendP < 0.01
Furthermore, the thermal width experienced by native species (mean ± SEM = 19 ± 1.5°C, n = 30) was significantly lower than that for non-native ones (mean ± SEM = 31.2 ± 1.5°C; Student's unpaired t -test, t = 7.7, n = 17, P < 0.0001). Hypothesis 2: the upper thermal extreme experienced in nature is correlated with the UTT For invasive ectotherms, a clear trend emerged between the geographical high temperature experienced and the UTT, with r 2 = 0.50 (Fig. 3 ; y = 0.862 x + 3.147, F = 15, n = 17, P < 0.01).