The effects of temperature and photoperiod on diapause development in the eggs of four species of Lestes (Odonata: Zygoptera)

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Abstract
Lestes disjunctus, L. unguiculatus, and L. dryas diapause late in embryogenese when the embryo is almost fully formed. Lestes congener enters diapause just before blastokinesis. Lestes disjunctus, L. unguiculatus, and L. congener undergo a primarily temperature-controlled phase of diapause development, which proceeds most rapidly at 10 °C. In the field it is completed in most eggs by the end of October in L. disjunctus and L. unguiculatus, and by the end of November in L. congener. Subsequent development in L. disjuncius and L. unguiculatus is inhibited by photoperiods shorter than 12 to 14 h. There apparently is some overlap between the temperature- and photoperiod-controlled phases. The inhibitory effects of short photoperiods gradually disappear during the winter. In L. congener there is no significant photoperiod-controlled second phase of diapause. Diapause development in L. dryas probably is similar to that in L. disjunctus and L. unguiculatus.

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