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Figure 3


Fig. 3. Heart rate response to temperature and salinity in differently acclimated mussels. Species are referred to by the first letter of the species' name: M. trossulus (t), M. galloprovincialis (g), M. edulis (e), and M. trossulus/M. galloprovincialis hybrids (h). Symbols connected by solid lines are 14°C-acclimated; symbols connected by dotted lines are 21°C-acclimated. Values are means ± s.e.m. For N and P values, see Table 2. (A) Resting heart rate measured at the acclimation temperatures (14°C or 21°C). (B) Response to heat stress (Hcrit); all species show an increase in Hcrit with increased acclimation temperature. While there are some differences in Hcrit among salinity treatments, salinity acclimation does not contribute statistically to the observed pattern. (C) Response to cold stress (lowest heart rate at 0°C); at comparable acclimations, M. trossulus has an equal or higher heart rate than M. galloprovincialis. Note that to make overlapping symbols visible, we offset the g-14°C data by +0.2°C along the x-axis. (D) Response to low salinity stress (Scrit); there is a clear increase in Scrit with increasing salinity acclimation in all species.





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