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Association of tree diameter with body size and lipid content of mountain pine beetles

Published online by Cambridge University Press:  01 May 2012

M. Graf ,
M.L. Reid ,
B.H. Aukema  and
B.S. Lindgren
M. Graf
Affiliation:
Natural Resources and Environmental Studies Institute, University of Northern British Columbia, Prince George, British Columbia, Canada V2N 4Z9
M.L. Reid
Affiliation:
Department of Biological Sciences, University of Calgary, Calgary, Alberta, CanadaT2N 1N4
B.H. Aukema
Affiliation:
Natural Resources and Environmental Studies Institute, University of Northern British Columbia, Prince George, British Columbia, Canada V2N 4Z9; and Department of Entomology, University of Minnesota, St. Paul, Minnesota 55108, United States of America
B.S. Lindgren*
Affiliation:
Natural Resources and Environmental Studies Institute, University of Northern British Columbia, Prince George, British Columbia, Canada V2N 4Z9
*
Corresponding author (e-mail: lindgren@unbc.ca).
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Abstract

Host tree diameter is considered an important predictor of the population dynamics of the mountain pine beetle, Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae: Scolytinae), but the relationship between host tree diameter and beetle traits is unclear. The primary objective of this study was to determine how the quality of individual mountain pine beetles, measured as body size (pronotum width) and lipid content, varied with the diameter of lodgepole pine trees, Pinus contorta var. latifolia Engelmann (Pinaceae). Naturally attacked trees, ranging in diameter from 10 to 35 cm, were selected from stands near Prince George, British Columbia, Canada. Colonisation density and pupal density generally increased with tree diameter, but the number of pupal chambers per gallery start remained constant. Tree diameter positively affected beetle body size, which in turn was positively correlated with absolute lipid content in both sexes and relative lipid content in males. However, tree diameter did not directly predict absolute lipid content, and relative lipid content decreased with tree diameter in males. Larger beetles emerged earlier in the emergence period with relative lipid content remaining constant throughout emergence. All relationships had considerable unexplained variation. Thus, the use of tree diameter or emergence time as predictors of population dynamics of mountain pine beetles should be done with caution.

Résumé

On considère que le diamètre de l'arbre hôte est une variable prédictive importante de la dynamique de population du dendroctone du pin ponderosa, Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae: Scolytinae), mais la relation entre le diamètre de l'arbre hôte et les traits du coléoptère n'est pas claire. Le principal objectif de notre étude est de déterminer comment la qualité de dendroctones du pin ponderosa individuels, déterminée par la taille corporelle (largeur du pronotum) et le contenu lipidique, varie en fonction du diamètre de pins vrillés, Pinus contorta var. latifolia Engelmann (Pinaceae). Nous avons sélectionné des pins attaqués de manière naturelle de diamètres variant de 10–35 cm dans des peuplements près de Prince George, Colombie-Britannique, Canada. La densité de colonisation et la densité de nymphes augmentent généralement en fonction du diamètre de l'arbre, mais le nombre de chambres nymphales par ouverture de galerie demeure constant. Le diamètre de l'arbre a un effet positif sur la taille corporelle du coléoptère, qui à son tour est en corrélation positive avec le contenu lipidique absolu chez les deux sexes et avec le contenu lipidique relatif chez les mâles. Cependant, le diamètre de l'arbre ne permet pas de prédire directement le contenu lipidique absolu et le contenu lipidique relatif décroît en fonction du diamètre de l'arbre chez les mâles. Les coléoptères de plus grande taille apparaissent plus tôt durant la période d’émergence et leur contenu lipidique relatif demeure constant durant toute la période d’émergence. Toutes ces relations contiennent beaucoup de variation inexpliquée. Il faut utiliser avec prudence le diamètre de l'arbre ou le moment de l’émergence comme variables prédictives de la dynamique de population du dendroctone du pin ponderosa.

Type
Original Article
Information
The Canadian Entomologist , Volume 144 , Issue 3 , 28 May 2012 , pp. 467 - 477
Copyright
Copyright © Entomological Society of Canada 2012

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