Results
Germination and influence of temperature
treatments
Overall, the experiment found low germination rates across all
temperature treatments with ~2 % (n = 44) of seeds
germinating from ambient locations and ~4 % (n = 73) of
seeds germinating from thermally affected locations despite viability
from all locations being >95 %. There were significant
differences in mean time to germination, germination likelihood and the
number of dead seeds depending on if seeds were sourced from thermally
affected sites or if they were from ambient sites.
Mean time to germination
There was no difference in mean time to germination (MTG) between the
two different sampling years. Cox models identified that the 16°C
treatment germinated significantly faster than all other treatments
(Figure 2; Table 1; p < 0.001). Seeds sourced from plants
living in thermally affected sites germinated faster (46.4 ± 5.7 days)
compared to seeds from ambient locations (52.7 ± 7.3 days) (p =
< 0.001; Table 1, Figure 3). Further, seeds in salinities of 8
ppt germinated faster than those in 32 ppt, however there were no
interactions between salinity and location or salinity and treatment.