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Sensitivity to juvenile hormone is not reduced in clustering monarch butterflies, Danaus plexippus, in Australia

ABSTRACT. Female monarch butterflies, Danaus plexippus (L.) were collected from clusters in the Sydney region at weekly intervals after cluster formation. They were neck‐ligated and injected with juvenile hormone (JH) in order to test for any period of lowered JH sensitivity during the non‐reproductive clustering phase. Response was assessed by production of mature oocytes. In all weekly samples, the mean response was equal to or greater than that of newly emerged females reared and maintained in optimal conditions, and was substantially higher than that reported for diapausing monarchs in North American clusters. The result is further evidence for the absence of a true reproductive diapause in New South Wales populations.