Abstract
Field perturbations of the foraging force of the continuously polymorphic carpenter ant,Camponotus pennsylvanicus, were conducted over a two-year period to evaluate colony responses. Feeding the insect growth regulator RO-13-5223 resulted in a decrease in the mean proportion of smaller workers in the forager force, colonies receiving this growth regulator, and the insect growth regulator Methoprene, exhibited greater coefficients of variation in morphic caste proportions than found in control colonies, especially during the second year of the study. Neither insect growth regulator could be demonstrated to affect the foraging intensity of the colonies.
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