Figure 5.

The number of byssal threads produced by mussels varied by temperature treatment and collection site. Significant main effects are indicated, the asterisk indicates significant difference between measured and predicted values under temperature variation. Tofino mussels produced significantly more byssal threads than Reed Point mussels. Mussels produced significantly fewer byssal threads when acclimated to at 18°C than when acclimated to other stable conditions. Reed Point mussels acclimated to variable temperature conditions produced significantly more mussels than predicted based upon acclimation to stable conditions. However, there was no difference between the amount of byssal threads predicted and actually produced by Tofino mussels acclimated to variable temperature treatments. Predicted values for variable conditions are bootstrapped estimates based upon byssal threat production at stable temperatures. All values shown are means ± s.e. except for predicted values, which are means ± s.d., as is standard for bootstrapped values.