Figure 3.

Concentration of toxins in caterpillar haemolymph. Haemolymph from caterpillars raised on eight species of Asclepias was analysed by HPLC; plant species codes are given in figure 1; plant species are arranged from lowest to highest foliar cardenolide concentration. Bars represent means ± s.e. Grey bars, Euploea core; blue bars, Danaus gilippus; red bars, D. plexippus. No cardenolides were detectable in the haemolymph of E. core (grey bars are shown for clarity). The grey bar for A. linaria is lacking as no E. core haemolymph sample was obtained. Inset: means ± s.e. of haemolymph cardenolides over all plant species (Online version in colour.)