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

  • W. W. Nijholt (a1) and T. S. Sahota (a1)

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.

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.

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References

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Amenta, J. S. 1964. A rapid chemical method for quantification of lipids separated by thin-layer chromatography. J. Lipid Res. 5: 270272.
Atkins, M. D. 1959. A study of the flight of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk. (Coleoptera: Scolytidae). I. Flight preparation and response. Can. Ent. 91: 283291.
Atkins, M. D. 1969. Lipid loss with flight in the Douglas-fir beetle. Can. Ent. 101: 164165.
Barlow, J. S. 1964. Fatty acids in some insect and spider fats. Can. J. Biochem. 42: 13651374.
Bligh, E. G. and Dyer, W. J.. 1959. A rapid method of total lipid extraction and purification. Can. J. Biochem. Physiol. 37: 911917.
Engelmann, F. 1970. The physiology of insect reproduction. Pergamon Press, Oxford.
Gilbert, L. I. 1967 a. Lipid metabolism and functions in insects, pp. 69211. In Beament, J. W. L., Treherne, J. E., and Wigglesworth, V. B. (Eds.), Advances in insect physiology. Academic Press, London and New York.
Gilbert, L. I. 1967 b. Changes in lipid content during the reproductive cycle of Leucophaea maderae and effects of juvenile hormone on lipid metabolism in vitro. Comp. Biochem. Physiol. 21: 237257.
Horning, M. G., Williams, E. A., and Horning, E. C.. 1960. Separation of tissue cholesterol esters and triglycerides by silicic acid chromatography. J. Lipid Res. 1: 482485.
Martin, J. S. 1969. Lipid composition of fat body and its contribution to maturing oocytes in Pyrrhocoris apterus. J. Insect Physiol. 15: 10251045.
McMullen, L. H. and Atkins, M. D.. 1961. Intraspecific competition as a factor in the natural control of the Douglas-fir beetle. For. Sci. 7: 197203.
Morrison, W. R. and Smith, L. M.. 1964. Preparation of fatty acid methyl esters and dimethylacetals from lipids with boron fluoride-methanol. J. Lipid Res. 5: 600608.
Nijholt, W. W. 1967. Moisture and fat content during the adult life of ambrosia beetle, Trypodendron lineatum (Oliv.). J. ent. Soc. Br. Columb. 64: 5155.
Nijholt, W. W. 1969. Fat content of the ambrosia beetle, Trypodendron lineatum (Oliv.) during attack and brood production. J. ent. Soc. Br. Columb. 66: 2931.
Penner, K. R. 1970. Metabolism of fatty acids in Ips paraconfusus Lanier (Coleoptera: Scolytidae): in vivo synthesis of fatty acids from acetate-1-14C in freshly emerged females. M.S. Thesis, Simon Fraser University, Burnaby, B.C.
Richeson, J. L., Nation, J. L., and Wilkinson, R. C.. 1971. Fatty acid composition in Ips calligraphus (Coleoptera: Scolytidae) during postembryonic development. Ann. ent. Soc. Am. 64: 251254.
Sahota, T. S. 1970. Haemolymph and ovarial proteins in the bark beetle, Dendroctonus pseudotsugae in relation to ovarian development. Can. J. Zool. 48: 13071312.
Sahota, T. S. 1973. Yolk deposition in Douglas-fir beetle oocytes: possible role of RNA synthesis in the follicular epithelium. J. Insect Physiol. 19: 18871895.
Sahota, T. S. and Ibaraki, A.. 1973. Yolk deposition in the Douglas-fir beetle, Dendroctonus pseudotsugae (Hopk.): the significance of physiological state of oocytes. Can. J. Zool. 51: 659661.
Thompson, S. N. and Bennett, R. B.. 1971. Oxidation of fat during flight of male Douglas-fir beetles, Dendroctonus pseudotsugae. J. Insect Physiol. 17: 15551563.

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

  • W. W. Nijholt (a1) and T. S. Sahota (a1)

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