Parental exposure to heat waves improves offspring reproductive investment in <i>Tetranychus urticae</i> (Acari: Tetranychidae), but not in its predator, <i>Phytoseiulus persimilis</i> (Acari: Phytoseiidae).

3 RESULTS 3.1 Effects of heat waves on total losses induced by escaping and mortality (i) Total losses : The statistical analysis revealed a highly significant species‐specific effect (PROC FREQ: χ 2 2 = 147.9; p < .0001) on the total losses (escaped, died) of predator and prey females: 40 (26%) out of 155 predators ( P. persimilis ) and 135 (65%) out of 206 prey ( T. urticae ) remained alive on the bean leaves until day 10, respectively.

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