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ENVIRONMENTAL AND GENETIC EFFECTS ON MEAN EGG WEIGHT IN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

G. T. Harvey
G. T. Harvey
Affiliation:
Canadian Forestry Service, Great Lakes Forest Research Centre, Sault Ste. Marie, Ontario P6A 5M7
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Abstract

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Laboratory studies of the mean weights of initial eggs (Ei) of the spruce budworm, Choristoneura fumiferana (Clem.), show that this value is determined by the genetic constitution of the female moth and is relatively independent of environmental control. Dietary differences experienced by the female during larval development, and originating from different hosts or from reduced nutrient levels in artificial diets, did not affect Ei values; however, depletion of nutrients sufficient to reduce fertility greatly did reduce Ei. Temperature conditions during the ultimate larval and pupal stages influence Ei values which vary inversely. Mean egg weights are strongly heritable and are readily selected for, thereby demonstrating the presence of strong genetic control.

Résumé

L'étude en laboratoire de la masse moyenne des oeufs initiaux (Ei) de la tordeuse des bourgeons de l'épinette, Choristoneura fumiferana (Clem.), montre que sa valeur est déterminée par le bagage génétique de la femelle et qu'elle est relativement indépendante du milieu. Le régime alimentaire de la femelle au cours de sa période larvaire, qui peut différer selon l'hôte ou selon les carences introduites artificiellement, n'a pas modifié Ei; toutefois, des carences suffisantes pour réduire la fertilité ont grandement réduit Ei. La température au cours du dernier stade larvaire et du stade de la chrysalide ont influé sur Ei de façon inversement proportionnelle. La masse moyenne des oeufs est fortement héritable et fait d'emblée l'objet d'une sélection, ce qui montre l'effet d'un puissant déterminisme génétique.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 9 , September 1983 , pp. 1109 - 1117
Copyright
Copyright © Entomological Society of Canada 1983

References

Campbell, I. M. 1958. A genetic study of factors determining fecundity in the genus Choristoneura Led. (Lepidoptera: Tortricidae). Ph.D. Thesis, University of Toronto.Google Scholar
Campbell, I. M. 1962. Reproductive capacity in the genus Choristoneura Led. (Lepidoptera: Tortricidae). I. Quantitative inheritance and genes as controllers of rates. Can. J. Genet. Cytol. 4: 272–288.CrossRefGoogle Scholar
Falconer, D. S. 1960. Introduction to Quantitative Genetics. Longman Group Ltd., London.Google Scholar
Harvey, G. T. 1957. The occurrence and nature of diapause-free development in the spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae). Can. J. Zool. 35: 549–572.CrossRefGoogle Scholar
Harvey, G. T. 1967. On coniferophagous species of Choristoneura (Lepidoptera: Tortricidae) in North America. V. Second diapause as a species character. Can. Ent. 99: 486–503.CrossRefGoogle Scholar
Harvey, G. T. 1974. Nutritional studies of eastern spruce budworm (Lepidoptera: Tortricidae). I. Soluble sugars. Can. Ent. 106: 353–365.CrossRefGoogle Scholar
Harvey, G. T. 1977. Mean weight and rearing performance of successive egg clusters of eastern spruce budworm (Lepidoptera: Tortricidae). Can. Ent. 109: 487–496.CrossRefGoogle Scholar
Harvey, G. T. 1983. A geographical cline in egg weights in Choristoneura fumiferana (Lepidoptera: Tortricidae) and its significance in population dynamics. Can. Ent. 115: 1103–1108.CrossRefGoogle Scholar
Harvey, G. T. and Stehr, G.. 1971. Experiments on field hybridization between western Choristoneura occidentalis Freeman males and native populations of eastern spruce budworm, Choristoneura fumiferana (Clem.) Freeman. Dep. Environ., Can. For. Serv. (Sault Ste. Marie, Ont.) Intern. Rep. 0–28.Google Scholar
McMorran, A. 1965. A synthetic diet for the spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae). Can. Ent. 97: 58–62.CrossRefGoogle Scholar
Miller, C. A. 1957. A technique for estimating the fecundity of natural populations of the spruce budworm. Can. J. Zool. 35: 1–13.CrossRefGoogle Scholar
Miller, C. A. 1963. The analysis of fecundity proportion in the unsprayed area. pp. 75–87 in Morris, R. F. (Ed.), The dynamics of epidemic spruce budworm populations. Mem. ent. Soc. Can. 31. 332 pp.Google Scholar
Miller, C. A. and Renault, T. R.. 1966. Notes on the fecundity of endemic populations of the spruce budworm. Dep. For. Rur. Devel. (Fredericton, N.B.) Intern. Rep. M-8.Google Scholar
Morris, R. F. and Fulton, W. C.. 1970. Heritability of diapause intensity in Hyphantria cunea and correlated fitness responses. Can. Ent. 102: 927–938.CrossRefGoogle Scholar
Outram, I. 1971. Morphology and histology of the reproductive system of the female spruce budworm, Choristoneura fumiferana (Lepidoptera: Tortricidae). Can. Ent. 103: 32–43.CrossRefGoogle Scholar
Richards, L. J. and Myers, J. H.. 1980. Maternal influences on size and emergence time of the cinnabar moth. Can. J. Zool. 58: 1452–1457.CrossRefGoogle ScholarPubMed
Sanders, C. J., Wallace, D. R., and Lucuik, G. S.. 1978. Flight activity of female eastern spruce budworm (Lepidoptera: Tortricidae) at constant temperatures in the laboratory. Can. Ent. 110: 627–732.CrossRefGoogle Scholar
Stehr, G. 1954. A laboratory method for rearing the spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae). Can. Ent. 86: 423–428.CrossRefGoogle Scholar