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).