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Figure 4.1 Developmental plasticity in Bicyclus butterflies. A, The seasonal forms illustrated by two sisters of B. safitza. The specimen to the left is of the wet-season form (WSF) and was reared at 27 °C, whereas the one to the right, which is of the dry-season form (DSF), was switched to a low temperature for a few days just before pupation. B, The wet-dry seasonal cycle in Malawi. A dry season with low rainfall (histogram) is followed by a wet season. Temperatures are cooler throughout most of the dry season before increasing prior to the rains. Two generations of the WSF are produced in each rainy period followed by a single generation of the DSF that emerges in the early dry season before the larval food plants have completely dried out.

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