Action of photoperiod at cold in diapausing Chrysopa carnea females (Chrysopidae,Neuroptera) |
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Authors: | I Hodek A Honěk |
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Institution: | (1) Institute of Entomology, Czechoslovak Academy of Science, Vininá 7, 12800 Prague 2, Czechoslovakia;(2) Institute of Plant Protection, Research Institute of Crop Production, 16106 Prague, Czechoslovakia |
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Abstract: | Summary To reveal the effect of photoperiod on insects under low temperatures, dormant females of Chrysopa carnea were exposed for 3 months (November–January) to cold (7°±2.5°C) and to long- or short-day conditions (18L:6D or 12L:12D). They were thereafter activated under short-day conditions at 25°C.The samples differed considerably in the incidence of ovipositing females, duration of pre- and post-oviposition period, and fecundity. All parameters evidenced a considerably higher reproductive activity of insects chilled under short-day conditions. It was thus confirmed that adults of C. carnea perceive photoperiod at cold. The action of short photoperiod at cold does not impair the subsequent oviposition; by contrast it promotes future reproduction, apparently also due to photoperiod changes. Although short-day photoperiod inhibits the activation at warm temperatures, it enables diapause development under cold temperatures.Dedicated to Prof. Dr. Hans Joachim Müller, Jena, on the occasion of his 65th birthday |
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