Modern Evolutionary Ecology
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A major focus of modern evolutionary ecology is the investigation of details of interactions between organisms in nature. Lawrence E. Gilbert writes about the Heliconius butterfly, which lays its eggs only on Passiflora vines. This is a case where an interacting pair of plant and animal influenced one another in the course of evolution. Such coevolution is often mutualistic so that the two organisms depend on one another, but this is not always the case. Some instances occur when one of the organisms is parasitic, and this is the type seen with the Heliconius and the Passiflora. The passion-flower vines have developed effective defenses against insects, but a few, among them this genus of butterfly, can circumvent these defenses. Heliconius is parasitic only on Passiflora vines, where the eggs hatch into larvae that feed on the leaves of the vine. Some species of the vine show the ability to mimic the bright yellow eggs of the butterfly in order to forestall the butterfly from depositing more eggs in the same site. Gilbert says one way to account for this is coevolution. Such an explanation might seem to be a stretch. This case of parasitic symbiosis is important because it is easier to study in the field and in artificial culture, and the Heliconius butterflies are prime experimental animals for a variety of investigations. The Passiflora-Heliconius system is ideal for the demonstration and study of coevolution. First, the interaction between the vines and the
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Approximate Word count = 996
Approximate Pages = 4 (250 words per page)
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