Fig. 8. Endogenous levels of heat-shock transcription factor-1 (HSF1) in three Tegula congeners field-acclimatized (July 1997) and laboratory-acclimated to 13, 18 or 23°C for 30–34 days. Values are means +1 S.E.M. N=5 for all data points except for T. funebralis under field conditions (N=4), at 13°C (N=3) and 18°C (N=4) and for T. montereyi at 18°C (N=4) and 23°C (N=4). For further details, see Fig. 3.