Table 1. Compilation of temperature impacts experienced by rear-edge and central populations of Scytothalia during the heatwave and translocation experiment.
| Source location | Heatwave/experimental treatment | Max temperature (°C) | Max stess anomaly (°C) | Max DHW (°C-weeks) | Recorded impact |
|---|---|---|---|---|---|
| Central | 2011 Heatwave | 23.86 | 2.12 | 8.83 | None |
| (Ce, Hamelin Bay) | Ce to Ce | 23.20 | 1.46 | 0.70 | None |
| Ce to RE | 24.41 | 2.67 | 22.54 | Net biomass loss, failed reproductive development, >60% cover of putative disease symptoms and mortality | |
| Ce to FRE | 24.40 | 2.66 | 22.87 | Net biomass loss, failed reproductive development, >50% cover of putative disease symptoms and mortality | |
| Range edge | 2011 Heatwave | 25.38 | 1.91 | 3.69 | None |
| (RE, Marmion) | RE to RE | 24.41 | 0.95 | 0 | None |
| RE to FRE | 24.40 | 0.93 | 0 | None | |
| Former range edge (FRE, Jurien Bay) | 2011 Heatwave | 27.34 | 3.50 | 9.46 | 100% Mortality |
Ce, central; FRE, former warm rear edge; RE, rear edge.
Impacts were compared for three common temperature stress metrics: maximum temperature; maximum thermal-stress anomaly; and maximum degree heating weeks (Max DHW). Note that only stress anomalies >2.5 °C consistently correspond impact among the different locations.