Eur. J. Entomol. 94 (4): 435-444, 1997
Photo-thermoperiodic responses in some species of lacewings (Neuroptera: Chrysopidae): Their role in diapause induction
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The effects of combinations of photoperiod and temperature on diapause induction in six species of lacewings (Chrysopidae) from the forest-steppe zone (Russia, 50°N) were examined. Diapause induction in the short day was temperature-independent ill all species, with exception of Chrysopa phyllochroma. In this species the incidence of diapause decreased within the range from 25 to 33°C. The long day prevented diapause only within particular temperature limits, which were species specific. In species with typical long-day photoperiodic response (C. perla, C. septempunctata and Chrysoperla carnea) daily temperature fluctuations were less favourable to diapause induction than constant mean temperature. In C. phyllochroma and C. abbreviata the similar high incidence of diapausing prepupae was induced both by daily natural thermoperiods and constant mean temperature. In experiments carried out under 12-h thermophase: 12-h cryophase conditions it was revealed that photo-thermoperiodic responses of C. phyllochroma were significantly dependent on cryophase temperature, whereas diapause of C. perla was determined mainly by photoperiod. The diversity of seasonal cycles in Chrysopa species and the role of photoperiod and thermoperiod in the development and diapause control in nature are discussed.
Keywords: Photoperiod, temperature, thermoperiod, cryophase, thermophase, diapause, seasonal cycle, Chrysopidae
Accepted: April 12, 1997; Published: October 1, 1997 Show citation
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