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THE EFFECT OF FOREST DISTURBANCES ON POPULATIONS OF WASPS AND BEES IN NORTHWESTERN ONTARIO (HYMENOPTERA: ACULEATA)

Published online by Cambridge University Press:  31 May 2012

R. E. Fye
Affiliation:
Great Lakes Forest Research Centre, Canadian Forestry Service, Sault Ste. Marie, Ontario

Abstract

Populations of wasps and bees are larger and more diverse in areas of recently disturbed boreal forest than in non-disturbed areas. Population differences are correlated directly with light penetration which also results in a larger array of pioneer ground cover. The ground cover provides abundant floral forage for the bees and adequate lepidopterous prey for the wasps. The regeneration of the forest results in a decline in the quantity and diversity of the ground cover and the attending aculeate populations. Results from timed census studies, glass-pane barrier traps, and trap nests reflected similar relative attractiveness of the study sites to wasps and bees.

Résumé

Les colonies de guêpes et d’abeilles sont plus denses et plus variées dans les régions récemment perturbées de la forêt boréale que dans celles non perturbées. Les différences entre ces populations sont en corrélation directe avec la pénétration de lumière, condition qui se traduit également par une plus grande luxuriance de la couverture vivante. La couverture du sol fournit une abondante pâture de fleurs aux abeilles et un champ propice aux guêpes pour la prédation de Lépidoptères. La régénération de la forêt a pour effet de réduire le volume et la diversité de cette couverture et, partant, les populations d’Aculés qui y vivent. Les résultats obtenus au moyen de recensements chronométrés, pièges à portillon vitré ou à filet, reflétaient un semblable attrait relatif des sites étudiés pour les guêpes et les abeilles.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1972

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