Figure 3.
The effect of a combination of heat shock and rapid cold-hardening pre-treatments in four larval stages (instars I, II, III and wandering late 3rd instars - w) of four strains of Drosophila melanogaster. Acute exposures were at the previously-determined LT90 at −7 °C and chronic exposures were at the LT90 for −2 °C (see Tables 1 & 2 for further details). All bars represent mean survival (± s.d.) derived from 3−5 replicates each consisting of 10−20 larvae. Bars sharing common letters are not statistically different from each other.