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PROGRESS TOWARDS EARLY DETECTION OF POPULATION QUALITY DIFFERENCES IN BARK BEETLES (COLEOPTERA: SCOLYTIDAE)

  • T. S. Sahota (a1), F. G. Peet (a1) and P. H. Bartels (a2)

Abstract

Samples of the Douglas-fir bark beetle, Dendroctonus pseudotsugae Hopk., taken from two different segments of the infested bole were different in gallery production, egg deposition, and yolk deposition. The same two groups were distinguished by comparing fat body cell nuclei taken before the onset of the reproductive period. Techniques for comparing nuclei involved creation and analysis of digital images of nuclei. These groups were indistinguishable from each other, at that stage, by any other known method. The two groups differed in total absorbance of Fuelgen-stained nuclei (DNA content) and nuclear area. Significance of these findings is discussed in relation to early detection of reproduction-related quality differences and population dynamics of bark beetles.

Les dendroctones du Douglas, Dendroctonus pseudotsugae Hopk., prélevés dans deux sections différentes du tronc se sont révélés différents quant à la production de galeries, au dépôt d'oeufs et au dépôt de vitellus. Une distinction a été établie entre les deux groupes par comparaison des noyaux cellulaires des corps gras prélevés avant le déclenchement de la période de la reproduction. Les deux groupes étaient indistinguables à cette période par toutes les autres méthodes connues. Les techniques de comparaison des noyaux comportent la création et l'analyse d'images numériques. Les deux groupes se sont trouvés différents quant à la grandeur et à l'absorption complète des noyaux cellulaires (contenu ADN) teints avec la teinture Fuelgen. L'importance de ces résultats est examinée du point de vue de la détection précoce des différences qualitatives des dendroctones quant à la reproduction.

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PROGRESS TOWARDS EARLY DETECTION OF POPULATION QUALITY DIFFERENCES IN BARK BEETLES (COLEOPTERA: SCOLYTIDAE)

  • T. S. Sahota (a1), F. G. Peet (a1) and P. H. Bartels (a2)

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