Figure 2.

(A) Forewing length of L. pulchella dragonflies during the summer of 1998. A cutoff of 42 mm was used to assign individuals to the early season (circles) or late season (squares) morphs. Filled symbols denote newly emerged adults, none of which were observed after July 13. The small data set for mid-June is the result of a period of cold, rainy weather during which there was little dragonfly activity. (B–D) Wing-beat frequency (B), the first principal component of relative abundances of different-sized TnT transcripts (Table 1) (C), and calcium sensitivity of demembraneated muscle fibers (D) as a function of body mass. The * in D indicates an outlier that may have resulted from an error in the measurement of calcium sensitivity.