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Entomophaga

, Volume 37, Issue 4, pp 583–590 | Cite as

Influence of feeding interval on reproduction and longevity ofPodisus sagitta (Het.: Pentatomidae)

  • P. de Clercq
  • D. Degheele
Article

Abstract

The effect of various feeding intervals on reproduction and longevity of the predatory bugPodisus sagitta (Fabricius) (Heteroptera: Pentatomidae) was studied in the laboratory. Isolated pairs of adult bugs were given moisture in excess and were fed 1 seventh-instar larva of the greater wax moth,Galleria mellonella (L.), with a mean weight of 90 mg every 1, 3, 7, 14 and 21 days. Reproduction ofP. sagitta reflected well the feeding intervals. Females fed at increasing time intervals reduced reproductive outputs by decreasing oviposition frequency and size of egg batches. Predators fed every 21 days produced a mean of only 1.0 egg per day in comparison with 9.9 eggs per day for females fed daily. Longevity of females fed daily was 110.7 days; females fed less frequently tended to live longer, with a maximum mean longevity of 217.5 days for females fed every 14 days. No cannibalism among adults was observed, but females were occasionally seen to feed on their own eggs. Availability of moisture was found to be essential for the predators to survive during periods of low food supplies. These findings are discussed in relation to the predator's adaptation strategies in conditions of prey scarcity.

Key-Words

Podisus sagitta predatory bug prey regimens reproduction adaptation 

Résumé

L'influence de différents régimes nutritionnels (intervalles entre les repas) sur la reproduction et la longévité de la punaise prédatricePodisus sagitta (Fabricius) (Het.: Pentatomidae) a été étudiée en laboratoire. A des couples d'adultes isolés on a offert de l'eau à volonté et une larve du 7ième stade de la fausse teigne de la cire,Galleria mellonella (L.), d'un poids moyen de 90 mg tous les 1, 3, 7, 14 et 21 jours. Les indices de reproduction deP. sagitta ont bien réflété l'intervalle entre les repas. Les femelles nourries moins fréquemment ont réduit leur fréquence d'oviposition et le nombre moyen d'œufs par ponte. Les femelles nourries tous les 21 jours ont produit en moyenne 1,0 œuf par jour comparé à 9,9 œufs par jour pour celles nourries journalièrement. La longévité des femelles nourries journalièrement a été de 110,7 jours; la survie des femelles nourries moins fréquemment a été plus longue, avec un maximum de 217,5 jours en moyenne pour les femelles nourries tous les 14 jours. Le cannibalisme entre adultes n'a pas été observé, mais les femelles nourries tous les 7, 14 et 21 jours ont été occasionnellement vues se nourrissant de leurs œufs. La présence d'eau s'est démontrée nécessaire pour assurer la survie des prédateurs pendant des périodes de faible prédation. Ces observations sont discutées en rapport avec l'adaptation de ce prédateur à des conditions de faible abondance des proies.

Mots Clés

Podisus sagitta hémiptère prédateur régime nutritionnel reproduction adaptation 

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Copyright information

© Lavoisier Abonnements 1992

Authors and Affiliations

  • P. de Clercq
    • 1
  • D. Degheele
    • 1
  1. 1.Laboratory of Agrozoology, Faculty of Agricultural SciencesUniversity of GentGentBelgium

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