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Photo-thermal regulation of diapause in Trichogramma piceum Djur. (Hymenoptera, Trichogrammatidae)

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Abstract

Interaction of the photoperiodic conditions of development of maternal females (day lengths of 2 to 22 h at 20°C) with the thermal regime of development of their progeny (temperature of 12 to 15°C at day length of 12 h) in determination of prepupal diapause in Trichogramma piceum was studied under laboratory conditions. At 15°C the diapause was practically absent. At lower temperatures, the proportion of diapausing prepupae was maximal (25% of larvae at 14°C, 70% of larvae at 13°, and 80% of larvae at 12°C) if the maternal females developed under short day conditions (10–12 h). When maternal females developed at day lengths of 18–20 h, diapause was rarely recorded at all temperatures, while ultra-short (less than 8–10 h) days also caused a decrease in the proportion of diapausing progeny. The right (ecologically important) threshold of this maternal long-day photoperiodic response was about 14–15 h independently of the temperature during the progeny development. These results make it possible to clarify the mechanism of the “maternal photoperiodic correction of the progeny thermal response.” Although the impact of the maternal photoperiodic response can be revealed only within a very narrow thermal range, the relative strength of the diapause-inducing effect of different day lengths is independent of the temperature regimen of the progeny development.

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Authors and Affiliations

  1. Zoological Institute, Russian Academy of Sciences, St. Petersburg, 199034, Russia

    S. Ya. Reznik, N. P. Vaghina & A. L. Vasiljev

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  1. S. Ya. Reznik
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  2. N. P. Vaghina
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  3. A. L. Vasiljev
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Original Russian Text © S.Ya. Reznik, N.P. Vaghina, A.L. Vasiljev, 2012, published in Entomologicheskoe Obozrenie, 2012, Vol. 91, No. 3, pp. 485–491.

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Reznik, S.Y., Vaghina, N.P. & Vasiljev, A.L. Photo-thermal regulation of diapause in Trichogramma piceum Djur. (Hymenoptera, Trichogrammatidae). Entmol. Rev. 93, 9–13 (2013). https://doi.org/10.1134/S0013873813010028

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