Figure 2.

Size-standardized metabolic rate (rVO₂, mean ± s.e., measured at 17°C) of D. pulex reared at two new temperatures for one, two, or three generations relative to controls being maintained at the original temperature (17°C). Deviations from the zero baselines thus indicate an upregulation (positive values) or downregulation (negative values) in VO₂. (a) Generation-specific mean rVO₂ across all clones; (b) clone-specific rVO₂ means across all generations.