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Evolution of host acceptance and its reversibility in a seed beetle

1. Adapting to a low‐quality plant may require modification of an insect's digestive physiology, oviposition behaviour, or other host‐use traits. If colonising a marginal host entails a cost, a decay in adaptation would be expected after selection is relaxed, i.e. if populations on a novel host are reverted to their high‐quality ancestral host.