Figure 1.

The short-term temperature dependencies of (a) daily gross primary production and (b) daily ecosystem respiration for heated (filled circles) and ambient treatments (open circles) over the annual temperature cycle. Each data point corresponds to a measurement in a single mesocosm on one of the seven sampling occasions. The solid lines correspond to the predictions of the constrained model, which was fitted to data using equations (3.3)–(3.6) and yielded the parameter estimates listed in table 1. Fluxes were standardized using these estimates in combination with community size-structure data for each pond. The dashed lines are unconstrained OLS regression models fitted to bivariate relationships (parameter estimates and statistics listed in the figure panels). Both regression models yielded 95% CIs for the slopes that overlapped with those of the constrained model (p > 0.05).