Entomophaga

, Volume 33, Issue 4, pp 505–515 | Cite as

Ecological requirements for hibernatingPropylea quatuordecimpunctata (L.) andCoccinella septempunctata [Col.: Coccinellidae]

  • J. L. Hemptinne
Article

Abstract

During 3 successive winters, we studied the dormancy sites ofPropylea quatuordecimpunctata (L.) andCoccinella septempunctata L., 2 species of ladybirds which hibernate in leaf litter. Samples of litter were taken from several kinds of forest to study the influence of 3 variables (exposure; altitude; sampling place: edge or inner wood) on the abundance of ladybirds.

We found the ecological requirements of the 2 species of coccinellids to be quite different:C. septempunctata prefers forest edges orientated towards the South and the West.P. quatuordecimpunctata prefers the inner wood and does not show a preference for station exposure. For each species, the number of ladybirds collected in the samples is positively correlated with station altitude. In addition, some observations were carried out to examine the main mortality factors just before and during dormancy. In maize fields near dormancy sites, the harvest is very harmful forC. septempunctata. During the winter,P. quatuordecimpunctata andC. septempunctata suffer fromBeauveria ssp. and some ladybirds have parasitoïds.

Key-Words

Propylea quatuordecimpunctata Coccinella septempunctata hibernation Beauveria ssp. parasitoïds 

Résumé

Durant 3 hivers successifs, on a étudié les sites d'hivernation dePropylea quatuordecimpunctata (L.) et deCoccinella septempunctata L., espèces hivernant toutes deux dans la litière forestière. Des échantillons de litière ont été récoltés pour étudier l'influence de 3 variables (exposition; altitude; lisière ou intérieur des peuplements) sur les effectifs de coccinelles.

Les exigences écologiques des 2 espèces sont différentes.C. septempunctata préfère les lisières orientées du Sud à l'Ouest, tandis queP. quatuordecimpunctata se rencontre à l'intérieur des peuplements. Pour les 2 espèces, on a mis en évidence une corrélation positive entre les effectifs observés et l'altitude des sites d'hivernation.

L'impact de quelques facteurs de mortalité intervenant avant et pendant l'hivernation a été évalué. La récolte des champs de maïs adjacents aux sites d'hivernation provoque de lourds dégâts aux populations deC. septempunctata. Durant l'hiver, les 2 espèces souffrent deBeauveria ssp. et abritent des parasitoïdes.

Mots Clés

Propylea quatuordecimpunctata Coccinella septempunctata hivernation Beauveria ssp. parasitoïdes 

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Copyright information

© Lavoisier Abonnements 1988

Authors and Affiliations

  • J. L. Hemptinne
    • 1
  1. 1.Laboratoire de Biologie animale et cellulaireUniversité Libre de BruxellesBruxellesBelgium

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