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Differences in the constitutive terpene profile of lodgepole pine across a geographical range in British Columbia, and correlation with historical attack by mountain pine beetle

Published online by Cambridge University Press:  02 April 2012

Erin L. Clark*
Affiliation:
Ecosystem Science and Management Program, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia, Canada V2N 4Z9
Allan L. Carroll
Affiliation:
Forest Sciences Department, University of British Columbia, 2424 Main Mall, Vancouver, British Columbia, Canada V6T 1Z4
Dezene P.W. Huber
Affiliation:
Ecosystem Science and Management Program, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia, Canada V2N 4Z9
*
1 Corresponding author (e-mail: eclark1@unbc.ca).

Abstract

The mountain pine beetle, Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae), is a destructive insect pest in western Nearctic conifer forests. Currently, British Columbia, Canada, is experiencing the largest recorded outbreak of this insect, including areas that historically have had low climatic suitability for it. We analyzed 26 constitutive resin terpenes in phloem samples from British Columbia lodgepole pine (Pinus contorta) populations to test for differential resistance to mountain pine beetle attack, based upon the likelihood of previous exposure to mountain pine beetle. We assessed sampled trees for number of mountain pine beetle attacks, number of pupal chambers, and tree survival the following spring. Significant differences were found when levels of certain terpenes in lodgepole pine populations that had likely experienced substantial mountain pine beetle infestations in the past were compared with those in populations that likely had not experienced large outbreaks of mountain pine beetle. Although we expected southern pine populations to contain more total terpenes than northern populations, owing to higher historical exposure to the beetle, the converse was found. Northern populations generally had higher levels of constitutive terpenes and beetle attack than southern populations. Because several terpenes are kairomones to the mountain pine beetle and also serve as precursors for the synthesis of pheromones, the lower levels of terpenes expressed by lodgepole pines from the historical range of the mountain pine beetle may render them less chemically perceptible to foraging beetles.

Résumé

Le dendroctone du pin ponderosa, Dendroctonus ponderosae Hopkins (Coleoptera : Curculionidae), est un insecte ravageur des forêts de conifères de l'Ouest néarctique. À présent, la Colombie-Britannique connaît l'épidémie la plus importante signalée de cet insecte, même dans des régions dont le climat dans le passé a été peu propice à ce coléoptère. Nous avons analysé 26 terpènes constitutifs dans des échantillons de phloème de populations de pins vrillés (Pinus contorta) de la Colombie-Britannique pour tester leurs différences de résistance aux attaques du dendroctone du pin ponderosa basées sur la probabilité d'expositions antérieures au dendroctone du pin ponderosa. Nous avons déterminé chez les arbres échantillonnés le nombre d'attaques par le dendroctone du pin ponderosa, le nombre de chambres nymphales et la survie des arbres au printemps suivant. Il existe des différences significatives de concentrations de certains terpènes entre les populations qui ont vraisemblablement connu d'importantes infestations de dendroctones du pin ponderosa dans le passé et les populations qui n’ont pas subi de telles grandes infestations du dendroctone du pin ponderosa. Bien que nous nous attendions à ce que les populations du sud contiennent plus de terpènes totaux que les populations du nord à cause de leur plus forte exposition dans le passé aux coléoptères, c’est l'inverse qui prévaut. Les populations nordiques ont généralement de plus fortes concentrations de terpènes constitutifs et de plus forts taux d'attaques des coléoptères que les populations du sud. Parce que plusieurs des terpènes sont des kairomones du dendroctone du pin ponderosa et servent de précurseurs dans la synthèse des phéromones, les concentrations plus faibles de terpènes affichées par les pins vrillés dans l'aire de répartition historique du dendroctone du pin ponderosa peut les rendre chimiquement moins perceptibles aux coléoptères en recherche de nourriture.

[Traduit par la Rédaction]

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Copyright
Copyright © Entomological Society of Canada 2010

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