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CHANGES IN TRIGLYCERIDE FATTY ACIDS DURING BROOD PRODUCTION OF DOUGLAS-FIR BEETLES (COLEOPTERA: SCOLYTIDAE)

Published online by Cambridge University Press:  31 May 2012

W. W. Nijholt  and
T. S. Sahota
W. W. Nijholt
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia
T. S. Sahota
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia
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Abstract

The triglyceride fatty acids of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk., were studied 0–21 days during the beetle’s reproductive period. Fatty acids present were identified as myristic (14:0), palmitic (16:0), palmitoleic (16:1), stearic (18:0), oleic (18:1), and linoleic (18:2). Palmitic acid increased from 12 to 23%, while palmitoleic decreased from 15 to 6% of the total triglyceride fatty acids during reproduction. Oleic acid was the predominant fatty acid in both sexes (approx. 65%) and formed 55% of the fatty acid moiety of the egg triglycerides.

Résumé

L’auteur étudia les acides gras à triglycérides du Dendroctone du Sapin de Douglas, Dendroctonus pseudotsugae Hopk. au moment où cet insecte se reproduisait (0–21 jours). Les acides gras étaient méristique (14 = 0), palmitique (16 = 0), palmitoléique (16 = 1), stéarique (18 = 0), oléique (18 = 1) et linoléique (18 = 2). Durant la reproduction, l’acide palmitique augmenta de 12 à 23%, tandis que l’acide palmitoléique diminua de 15 à 6% de la quantité totale d’acides gras à triglycérides. L’acide oléique était la plus abondante chez les deux sexes (environ 65%) et formait 55% de la portion d’acides gras chez les triglycérides des œufs.

Type
Articles
Information
The Canadian Entomologist , Volume 106 , Issue 9 , September 1974 , pp. 927 - 932
Copyright
Copyright © Entomological Society of Canada 1974

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