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GEOGRAPHICAL DISTRIBUTION OF CHORISTONEURA SPECIES (LEPIDOPTERA: TORTRICIDAE) FEEDING ON ABIES, PICEA, AND PSEUDOTSUGA IN WESTERN CANADA AND ALASKA

Published online by Cambridge University Press:  31 May 2012

R.F. Shepherd ,
T.G. Gray  and
G.T. Harvey
R.F. Shepherd
Affiliation:
Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
T.G. Gray*
Affiliation:
Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
G.T. Harvey
Affiliation:
Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, 1219 Queen Street East, Sault Ste. Marie, Ontario, Canada P6A 5M7
*
1 Author to whom correspondence should be addressed.
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Abstract

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Male moths of Choristoneura occidentalis Freeman, C. biennis Freeman, C. fumiferana (Clemens), and C. orae Freeman were caught in pheromone-baited traps. Ten traps were placed at each site, five baited with an aldehyde lure and five with an acetate lure. This procedure permitted separation of species based on the specific chemical lure and also provided specimens for further study of morphological and isozyme differences. The color of the forewings, presence or absence of spicules on the aedeagus, and a specific allozyme frequency were determined on selected specimens where these characteristics were useful in separating species at a particular site. Distributions of all species were more extensive than previously known, sometimes adding hundreds of kilometres to the recorded range. Areas of sympatry were identified and the fidelity and usefulness of characteristics for separating species in areas of overlap were discussed.

Résumé

Des mâles de Choristoneura occidentalis Freeman, de C. biennis Freeman, de C. fumiferana (Clemens) et de C. orae Freeman ont été capturés dans des pièges à phéromone. Dix pièges ont été placés dans chacun des sites : cinq dont l’appât était un aldéhyde et cinq de l’acétate. Grâce à cette technique, il a été possible de séparer les espèces à l’aide d’un appât chimique spécifique et d’obtenir aussi des spécimens pour poursuivre l’étude sur les différences morphologiques et la constitution des isozymes. La couleur des ailes antérieures, la présence ou l’absence de spicules sur l’édéage, et la fréquence d’une allozyme spécifique ont été établies chez certains spécimens lorsque ces caractéristiques étaient utiles pour séparer les espèces à un endroit donné. L’aire de répartition de toutes les espèces était plus étendue que l’on croyait; elle comportait parfois des centaines de kilomètres de plus que l’aire connue. Des aires de sympatrie sont déterminées; les auteurs traitent de la fidélité et de l’utilité des caractéristiques pour séparer les espèces dans les aires de chevauchement.

Type
Articles
Information
The Canadian Entomologist , Volume 127 , Issue 6 , December 1995 , pp. 813 - 830
Copyright
Copyright © Entomological Society of Canada 1995

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