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Number of instars and sexual dimorphism of Tetropium fuscum (Coleoptera: Cerambycidae) larvae determined by maximumlikelihood

Published online by Cambridge University Press:  08 August 2012

Leah Flaherty ,
Jacques Régnière  and
Jon Sweeney
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Abstract

Tetropium fuscum (Fabricius) (Coleoptera: Cerambycidae) isa Palaearctic wood borer that has been established in Atlantic Canada sinceat least 1990. Neither the number of instars nor methods for determining theinstar of field-collected larvae have been documented for this species.Head-capsule width was measured for 949 T. fuscum larvae inorder to determine the number of instars in this species, estimate the meanand variance of head-capsule widths associated with each instar, andidentify whether head-capsule width is sexually dimorphic. Head-capsulewidth data were analysed using maximum likelihood analysis of mixture modelsand the Brooks–Dyar rule. Our results provide strong support for theexistence of six larval instars, with sexually dimorphic head-capsule widthsin instars five and six. The probability of misclassifying larvae intoinstar-specific and sex-specific categories ranged from 0.6% to 12.8%, withthe highest probabilities occurring when assigning a sex to fifth-instar andsixth-instar larvae.

Résumé

Le Tetropium fuscum (Fabricius) (Coleoptera: Cerambycidae)est un insecte xylophage paléarctique qui est établi dans les provinces deatlantiques du Canada depuis au moins 1990. Ni le nombre de stades larvairesni les méthodes permettant de déterminer le stade des larves récoltées surle terrain n'ont été documentés pour cette espèce. La largeur de la capsulecéphalique de 949 larves a été mesurée afin de déterminer le nombre destades larvaires chez cette espèce, d'estimer la moyenne et la variance desvaleurs de largeur de capsule céphalique associées à chaque stade et devérifier si la largeur de la capsule céphalique diffère selon le sexe. Lesdonnées relatives à la largeur de la capsule céphalique ont été analysées àl'aide de la méthode du maximum de vraisemblance de modèles de mélangegaussiens et de la règle de Brooks–Dyar. Nos résultats confirmentl'existence de six stades larvaires et indiquent que la largeur de lacapsule céphalique diffère selon le sexe chez les larves de cinquième et desixième stades. Le risque de se méprendre sur l’âge et le sexe d'une larvevariait entre 0,6%–12,8%, les risques d'erreurs les plus élevés étantassociés à la détermination du sexe des larves de cinquième et de sixièmestades.

Information

Type
Original Article
Information
The Canadian Entomologist , Volume 144 , Issue 5 , October 2012 , pp. 720 - 726
Copyright
Copyright © Entomological Society of Canada 2012

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