The behavior and polymorphism of insects depend on environmental factors and on seasonal and circadian rhythms. Locomotor activity is also influenced by physiological states (imminent molting, sexual maturity) that are dependent on hormones. For example, in lepidopteran prepupae, a decrease in juvenile hormone or a surge of ecdysterone causes behavioral changes such as arrested feeding and decline in locomotor activity, or, on the contrary, provokes the wandering stage. During the period of sexual activity, juvenile hormone triggers the behavioral sequences that precede copulation and oviposition. In addition, juvenile hormone stimulates the alimentary flight and migratory flight in several insects. Metabolic neurohormones are involved in flight and in activity, providing the substrates for muscle functioning, but certain neurohormones exert a specific action in the regulation of behavior and polymorphism.
KeywordsLocomotor Activity Circadian Rhythm Juvenile Hormone Ventral Nerve Cord Neurosecretory Cell
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