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TEMPERATURE INDUCED VARIATION IN THE RATES OF REPRODUCTIVE PROCESSES IN DENDROCTONUS RUFIPENNIS (COLEOPTERA: SCOLYTIDAE): A NEW APPROACH TO DETECTING CHANGES IN POPULATION QUALITY

Published online by Cambridge University Press:  31 May 2012

T.S. Sahota  and
A.J. Thomson
T.S. Sahota
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia V8Z 1M5
A.J. Thomson
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia V8Z 1M5
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Abstract

To discover measurable parameters for detecting quality differences (with respect to reproduction) in insect populations, variations in temperature were utilized to obtain manifestation of quality at different levels. Rates of reproductive and associated processes such as yolk deposition, gallery excavation, and oviposition were measured in Dendroctonus rufipennis (Kirby) at four temperatures. Information presented here allows an estimation of D. rufipennis reproduction as affected by temperature. Among the various parameters measured the length of initial egg-free gallery and the number of eggs/unit productive gallery length and yolk deposition rate could be used to discriminate bark-beetle population quality. Rates of yolk deposition appeared most useful and widely applicable for this purpose.

Résumé

Pour découvrir des paramètres mesurables afin de déceler les différences de qualité (quant à la reproduction) chez les populations d’insectes, les auteurs ont utilisé des variations de température pour obtenir une manifestation de la qualité à divers niveaux. Ils ont mesuré les taux de reproduction et les procédés connexes, tels la déposition de vitellus protéiniques, l’excavation de galeries et les taux d’oviposition chez le Dendroctonus rufipennis (Kirby), à quatre températures différentes. Les renseignements divulgués dans cet article permettent de faire une évaluation de la reproduction du D. rufipennis, telle qu’influencée par la température. Au nombre des divers paramètres mesurés, on compte la longueur des galeries initiales libres d’oeufs, puis celle des galeries à unités productrices d’oeufs et le taux de déposition de vitellus protéiniques, utilisés pour distinguer la qualité des populations de ce dendroctone. Les taux de déposition de vitellus protéiniques ont semblé les plus utiles et les plus applicables à de telles fins.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 9 , September 1979 , pp. 1069 - 1078
Copyright
Copyright © Entomological Society of Canada 1979

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