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Costs and benefits of host feeding in the parasitoid wasp Trichogramma turkestanica
Authors:Chiara Ferracini  Guy Boivin  & Alberto Alma
Institution:Di.Va.P.R.A. –Entomologia e Zoologia applicate all'Ambiente 'Carlo Vidano', University of Turin, via L. da Vinci, 44 –10095 Grugliasco (TO), Italy,;Horticultural Research and Development Centre, Agriculture and Agri-food Canada, 430 Boul. Gouin, Saint-Jean-sur-Richelieu, Quebec, Canada J3B3E6
Abstract:Females of the parasitoid wasp Trichogramma turkestanica Meyer (Hymenoptera: Trichogrammatidae) generally host feed after ovipositing on the first egg of Ephestia kuehniella Zeller (Lepidoptera: Pyralidae) they encounter. We measured the impact of host feeding on the fecundity and longevity of females, in absence of host or food, and on the fitness of their progeny. We also determined if the frequency of host feeding is influenced by the humidity level at which T. turkestanica females developed. Host feeding increased egg production by 70% but decreased female longevity. This impact of host feeding on the longevity of females is probably due to the allocation of carbohydrates to egg production at the expense of somatic maintenance. Humidity did not influence the occurrence or duration of host feeding. The size of individuals developing in eggs on which females host fed was smaller, indicating that their fitness was affected.
Keywords:fecundity  longevity  fitness  Trichogrammatidae  Hymenoptera  resource allocation  concurrent host feeding
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