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ON THE DYNAMICS OF BLACKHEADED BUDWORM POPULATIONS1

Published online by Cambridge University Press:  31 May 2012

Alan A. Berryman
Alan A. Berryman
Affiliation:
Department of Entomology, Washington State University, Pullman, Washington, USA 99164–6432
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Abstract

Based on a simple graphic analysis, I conclude that blackheaded budworm population density cycles are caused by delayed negative feedback processes, probably due to the numerical response of insect parasitoids. The parasitoid–host interaction, however, has a stable solution and continuous population density cycles can only be maintained in a variable environment.

Résumé

Sur la base d’une simple analyse graphique, je conclus que les fluctuations cycliques de la densité de population de la tordeuse à tête noire de l’épinette sont causées par des processus négatifs de régulation à retardement, résultant probablement de la réponse numérique des insectes parasitoïdes. L’interaction hôte–parasitoïdes a cependant une solution stable et le maintien des cycles de densité de population repose sur la variabilité environnementale.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 8 , August 1986 , pp. 775 - 779
Copyright
Copyright © Entomological Society of Canada 1986

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