Summary
In eggs of European Tettigoniidae species, an initial diapause can occur just after blastoderm formation and a final diapause close to the end of embryonic development. The effect of photoperiod experienced maternally on the induction of the initial diapause was studied, using 13 species from Central and Southeastern Europe. In Conocephalus dorsalis and Platycleis albopunctata there was no initial diapause induced by photoperod, while, in Tettigonia-and Saga-species and in Metrioptera saussuriana it occurred independently of day length. In Metrioptera roeseli, M. bicolor, Leptophyes punctatissima, Eupholidoptera smyrnensis, and Decticus verrucivorus, oviposition at short day induced an initial diapause, while after oviposition at long day, the eggs developed directly until final diapause. On the other hand, in up to 1/4 of the eggs of Pholidoptera griseoaptera an initial diapause was induced by long day length. Populations of D. verrucivorus from different latitudes differed with respect to the critical day length. For E. smyrnensis and M. roeseli, a photoperiodic response curve was calculated.
In the Rhodian population of E. smyrnensis, the dormancy sequence of initial and final embryonic diapause can be used for aestivation and hibernation within an annual life cycle, while enabling hibernation in successive years for the Central European species. The population of D. verrucivorus near Aachen has an “obligatory” plurennial life cycle, since the critical day length for development without initial diapause is above the range of day length occurring in the field.
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Ingrisch, S. The plurennial life cycles of the European Tettigoniidae (Insecta: Orthoptera). Oecologia 70, 617–623 (1986). https://doi.org/10.1007/BF00379914
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DOI: https://doi.org/10.1007/BF00379914