Abstract
Three species of nymphalid buttertflies with different types of adult feeding behaviour were examined to see how the allocation of larval-derived resources to abdomen vs thorax change with age. Adults of Pararge aegeria and Speyeria mormonia feed on poor-quality diets. They are expected to be more dependent on larval-derived reserves stored in the abdomen for reproduction than are species with high-quality diets. In accordance with these expectations abdomen mass decreases with age in both males and females. Furthermore, thorax mass of females also decreases with age. Since the bulk of the thorax consists of flight muscles, this suggests that old females use resources derived from flight muscles for egg production
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