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EFFECTS OF ELEVATION ON THE RATE OF DEVELOPMENT OF WESTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) IN BRITISH COLUMBIA

Published online by Cambridge University Press:  31 May 2012

A. J. Thomson ,
J. W. E. Harris ,
R. H. Silversides  and
R. F. Shepherd
A. J. Thomson
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia V8Z 1M5
J. W. E. Harris
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia V8Z 1M5
R. H. Silversides
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia V8Z 1M5
R. F. Shepherd
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia V8Z 1M5
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Abstract

A simple empirical model of temperature variation with elevation was successfully used to explain variation in observed rates of development of larvae and pupae of the western spruce budworm in mountainous terrain. Hopkins' Bioclimatic Law did not adequately describe development of stages earlier than the sixth instar. Regional differences in the effect of elevation are demonstrated and related to coastal and interior conditions. Direct solar heating effects appear to be of major significance in the early instars. The empirically-derived rates of temperature decrease could be generally applied to regions with dry inland conditions, but not to moist coastal regions.

Résumé

Un simple modèle empirique de la variation de la température selon l'altitude a permis d'expliquer les variations observées de la vitesse de croissance chez les larves et les chrysalides de la tordeuse occidentale de l'épinette en terrain montagneux. La loi de Hopkins était insatisfaisante pour les stades antérieurs au sixième. Des différences régionales de l'effet de l'altitude ont été mises en évidence et corrélées à des régimes continental et maritime. Les effets du réchauffement direct par le soleil semblent de la plus haute importance pour les premiers stades larvaires. Les gradients de refroidissement obtenus de façon empirique étaient généralement valables pour les régions à régime continental sec, mais non pour celles à régime maritime humide.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 9 , September 1983 , pp. 1181 - 1187
Copyright
Copyright © Entomological Society of Canada 1983

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