, Volume 37, Issue 6, pp 599-601

Flight enhances juvenile hormone inactivation inDanaus plexippus plexippus L. (Lepidoptera: Danaidae)

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Adult Monarch butterflies injected with3H-juvenile hormone (JH) showed a significant increase in haemolymph JH metabolites after a 40 min flight compared to unflown controls. In addition, haemolymph enzymatic JH metabolism was shown to increase with thoracic temperature increases previously shown to be associated with flight.

We thank Paul Cherubini for supplying California Monarchs, Dr L.I. Gilbert for his helpful suggestions, Jeanne Whitaker for secretarial assistance, and Henry Lessman for aid in insect culture.