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Influence de la densité de population larvaire sur la taille des adultes, la durée de développement et la fréquence de la diapause chezPteromalus puparum L. [Hym., Chalcidien]

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Summary

The parasitoid waspPteromalus puparum was reared for many generations under controlled laboratory conditions: larval development in diapausing pupae ofPieris brassicae, 14 hours photoperiod, temperature of 21 °C or 25 °C. The fluctuations in the density of population appear to be the main source of variation for larval development.

An increase in the number of larvae living in the same host pupa results in a decrease of adult size, a reduction of developmental time and a diminution of incidence of larval diapause.

According to these results, it appears that a high population density hastens the occurrence of metamorphosis and makes it easier. It is suggested that various nervous stimulations, such as food shortage and interactions between larvae, may induce the onset of neurosecretion by the brain.

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Authors and Affiliations

  1. Laboratoire de Zoologie générale, Faculté des Sçiences de Lyon, Lyon, Frankreich

    M. Bouletreau & J. David

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  1. M. Bouletreau
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  2. J. David
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Bouletreau, M., David, J. Influence de la densité de population larvaire sur la taille des adultes, la durée de développement et la fréquence de la diapause chezPteromalus puparum L. [Hym., Chalcidien]. Entomophaga 12, 187–197 (1967). https://doi.org/10.1007/BF02370616

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