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VARIATION IN WEIGHT OF ALEOCHARA BILINEATA (COLEOPTERA: STAPHYLINIDAE) IN RELATION TO HOST SIZE AND REPRODUCTION

Published online by Cambridge University Press:  31 May 2012

X. Langlet ,
G. Boivin ,
E. Brunel  and
J.P. Nénon
X. Langlet
Affiliation:
Laboratoire de Zoologie, Institut National de la Recherche Agronomique, Domaine de la Motte au Vicomte, BP29 35653, Le Rheu Cédex, France
G. Boivin
Affiliation:
Centre de Recherche et de Développement en Horticulture, Agriculture et agro-alimentaire Canada, 430 boulevard Gouin, Saint-Jean-sur-Richelieu, Quebec, Canada J3B 3E6
E. Brunel
Affiliation:
Laboratoire de Zoologie, Institut National de la Recherche Agronomique, Domaine de la Motte au Vicomte, BP29 35653, Le Rheu Cédex, France
J.P. Nénon
Affiliation:
Laboratoire d'Écobiologie des Insectes Parasitoïdes, Campus de Beaulieu, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cédex, France
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Abstract

No sexual dimorphism in weight was observed at emergence of adult Aleochara bilineata Gyll. (Coleoptera: Staphylinidae). The weight of adults was strongly correlated with the size of the pupa in which the parasitoid developed. Newly emerged adults increased in weight after feeding, and this increase was greater in females than in males, reflecting the beginning of oogenesis. We showed that females invested simultaneously in reproduction and somatic functions the first day following mating. Although males and females showed no significant differences in weight at emergence, the females fed actively upon emergence and weighed significantly more than the males for 30 days after emergence. After that period, most of the eggs has been laid and both male and female weights were similar.

Résumé

Aucune différence de poids entre les sexes n’a été observée chez les adultes de Aleochara bilineata Gyll. (Coleoptera : Staphylinidae) à l’émergence. Le poids des adultes est fortement relié à la taille de la pupe hôte dans laquelle le parasitoïde a effectué son développement. Le poids des adultes nouvellement émergés a augmenté après qu’ils aient mangé et cette augmentation pondérale était supérieure chez les femelles reflétant le démarrage de l’ovogénèse. Nous montrons que les femelles investissent simultanément dans la reproduction et les fonctions somatiques le jour suivant l’accouplement. A l’émergence, le poids des mâles et des femelles n’étaient pas significativement différents mais ces dernières se sont nourries activement dès l’émergence et leur poids est devenu significativement supérieur à celui des mâles pour les 30 premiers jours. Après cette période, la plupart des oeufs ont été pondus et le poids des mâles et des femelles est redevenu similaire.

Type
Articles
Information
The Canadian Entomologist , Volume 130 , Issue 3 , June 1998 , pp. 257 - 265
Copyright
Copyright © Entomological Society of Canada 1998

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