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Morphometric study of the Pissodes strobi complex (Coleoptera: Curculionidae)

Published online by Cambridge University Press:  31 May 2012

Daryl J.M. Williams  and
David W. Langor
Daryl J.M. Williams*
Affiliation:
Natural Resources Canada, Canadian Forestry Service, Northern Forestry Centre, 5320-122nd Street, Edmonton, Alberta, Canada T6H 3S5
David W. Langor
Affiliation:
Natural Resources Canada, Canadian Forestry Service, Northern Forestry Centre, 5320-122nd Street, Edmonton, Alberta, Canada T6H 3S5
*
1 Corresponding author (e-mail: dawillia@nrcan.gc.ca).
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Abstract

Morphometric data were collected on 15 characters in adults of the species of the Pissodes strobi complex (P. nemorensis (Germar), P. schwarzi Hopkins, P. strobi (Peck), and P. terminalis Hopping). Data were examined using stepwise discriminant analysis to determine if all characters contribute significantly to the diagnosis of taxa, and their relative amounts of resolving power were illuminated using canonical variates analysis. Discriminant functions were generated to diagnose species. Separate discriminant functions were generated for each sex for populations from eastern and western North America. Significant sexual dimorphism and variability in body size decrease the utility of morphological characters for diagnosis, but did not prevent the formulation of useful discriminant functions, particularly when selected ratios that control for body size were added.

Résumé

Des données morphométriques relatives à 15 caractères ont été relevées chez des adultes des espèces du complexe Pissodes strobi (P. nemorensis (Germar), P. schwarzi Hopkins, P. strobi (Peck) et P. terminalis Hopping). Les données ont été soumises à une analyse discriminante pas à pas pour vérifier si tous les caractères ont une importance significative dans la diagnose des taxons et leur pouvoir de résolution relatif a été mis en lumière par une analyse des variables canoniques. Des fonctions discriminantes ont été générées pour reconnaître les espèces. Une fonction discriminante a été générée pour chacun des deux sexes chez les populations nord-américaines de l’est et de l’ouest. Le dimorphisme sexuel important et la variabilité de la taille du corps diminuent l’utilité des caractères morphologiques pour établir la diagnose, mais les fonctions discriminantes sont très utiles, particulièrement lorsqu’elles sont combinées à des rapports choisis qui tiennent compte de la taille.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 4 , August 2002 , pp. 447 - 466
Copyright
Copyright © Entomological Society of Canada 2002

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