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PREDATION ON PUPAE OF THE SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) ON THE FOREST FLOOR

Published online by Cambridge University Press:  31 May 2012

Brett Kelly  and
Jacques Régnière
Brett Kelly
Affiliation:
Canadian Forestry Service, Great Lakes Forest Research Centre, Sault Ste Marie, Ontario P6A 5M7
Jacques Régnière
Affiliation:
Canadian Forestry Service, Great Lakes Forest Research Centre, Sault Ste Marie, Ontario P6A 5M7
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Abstract

Predation on spruce-budworm, Choristoneura fumiferana (Clem.), pupae on the forest floor was estimated at 72.5% per day. It is unlikely that many adults of the spruce budworm emerge from the forest floor and there would be little bias introduced in the estimation of apparent fecundity by disregarding pupae on the ground. There were large seasonal fluctuations in the rate of predation attributable to various predator groups; the overall rate ranged from 66 to 91% per day. Low temperatures had no detectable effect on vertebrate predation, but reduced invertebrate predation; however, this effect is unlikely to result in much variation in survival of pupae on the forest floor.

Résumé

Un taux journalier de prédation de 72.5% a été observé chez des pupes de la tordeuse des bourgeons de l'épinette, Choristoneura fumiferana (Clem.), placées au sol. Il est donc peu probable qu'un grand nombre d'adultes puisse émerger du sol forestier. Donc, il y a peu de biais introduit dans l'estimation de la fécondité apparente de l'insecte si les pupes au sol sont négligées. D'importantes fluctuations du taux de prédation par divers groupes de prédateurs ont été observées. Toutefois le taux global est demeuré relativement élevé. Les températures basses n'ont pas affecté la prédation par les vertébrés, mais ont réduit celle des invertébrés. Cet effet ne devrait cependant pas mener à des variations importantes du taux de survie des pupes au sol.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 1 , January 1985 , pp. 33 - 38
Copyright
Copyright © Entomological Society of Canada 1985

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