F1 generation
Exposure to MHW strongly reduced the survival of both males and females (MHW, Table 1, Fig. 2). The lethal effect of MHW was independent of FPC exposure, as indicated by an insignificant interaction of MHW × FPC (Table 1, Fig. 2).
The reproductive success and grazing of P. incisus were overall affected negatively by MHW (MHW, Table 1, Fig. 3a-e). The hatched nauplii per clutch dropped by 62% at 34°C (Table 1, Fig. 3c). The cumulative nauplii and faecals were 27% and 28% lower in MHW than in the control temperature (Table 1, Fig. 3d,e). The FPC effect on the percentage of females with hatched eggs was insignificant (Table 1, Fig. 3b). The number of hatched nauplii per clutch, and cumulative faecals ofP. incicus increased in the presence of FPC, but the FPC effect was several times higher in the control temperature than in MHW (MHW × FPC, Table 1, Fig. 3c,e). For the clutch size, the effect of FPC was statistically insignificant in both temperatures (MHW × FPC, Table 1, Fig. 3a). P. incisus produced approximately 15% more cumulative nauplii in the presence of FPC only in control temperature, but not in MHW (MHW × FPC, Table 1, Fig. 3d). The correlation of cumulative nauplii production and cumulative faecals was insignificant (F1, 36 = 2.65, P = 0.11, slope ± 1 SE = 0.38 ± 0.24).