Comparative analysis of maternal and grand-maternal photoperiodic responses of Trichogramma species (Hymenoptera: Trichogrammatidae)

• Published in: European journal of entomology Vol. 110; no. 3; pp. 451 - 460
• Main Authors: Voinovich, Natalia D, Vaghina, Nina P, Reznik, Sergey Ya
• Format: Journal Article
• Language: English
• Published: Ceske Budejovice Institute of Entomology 01.07.2013; Institute of Entomology, Biology Centre, Czech Academy of Science
• Subjects: cumulative photoperiodic effect; diapause; Eggs; grand-maternal effect; Hymenoptera; Hypotheses; maternal effect; photoperiod; Studies; Temperature; trichogramma; trichogrammatidae
• ISSN: 1210-5759; 1802-8829
• DOI: 10.14411/eje.2013.060

Maternal and grand-maternal photoperiodic responses of Trichogramma buesi, T. embryophagum, T. evanescens, T. piceum, T. principium, and T. telengai were investigated in laboratory conditions. During the experiment, grand-maternal and maternal generations developed at 20 degrees C and one of the 4 photoperiodic regimes: L : D = 12 : 12, 14 : 10, 16 : 8, and 18 : 6 (in total, 16 combinations) while the progeny developed at L : D = 12 : 12 and one of the 3 thermal regimes: 13, 14, and 15 degrees C. The proportion of diapausing individuals in the progeny of all the studied species was significantly dependent on the direct influence of temperature and on the maternal photoperiodic response. The influence of the photoperiodic conditions during development of the grandmaternal generation was statistically significant in 5 of the 6 studied species, being relatively weak in T. embryophagum and T. telengai, whose geographical ranges extend up to north-western regions of Europe.