Comparing the effects of five naturally occurring monosaccharide and oligosaccharide sugars on longevity and carbohydrate nutrient levels of a parasitic phorid fly, Pseudacteon tricuspis

Physiological Entomology - Tập 31 Số 1 - Trang 46-56 - 2006
L. Chen1, Henry Y. Fadamiro1
1Department of Entomology and Plant Pathology Auburn University Auburn Alabama U.S.A.

Tóm tắt

Abstract.  The longevity and nutrient levels of Pseudacteon tricuspis provided with 1 m solutions of five naturally occurring sugars, fructose, glucose, sucrose, trehalose and melezitose, are compared. All but melezitose, result in significant increases in the longevity of P. tricuspis in comparison with sugar‐starved flies (flies provided with water only). Sugar‐starved female and male P. tricuspis have an average longevity of 3.3 and 4.1 days, respectively. Provision of free water in addition to sugar solution is necessary for optimum longevity by female and male flies. Longevity is increased by 2.4–2.6‐fold by the two monosaccharides, fructose and glucose, and by 2.6–2.8‐fold by the disaccharides, sucrose and trehalose. Phorid flies provided with the trisaccharide sugar, melezitose, had a marginal increase in lifespan (approximately 1 day), but this is not significantly different from the longevity of sugar‐starved flies. Significantly greater levels of total sugars are detected in P. tricuspis fed the disaccharide sugars (sucrose, trehalose) or the monosaccharide sugars (fructose, glucose), compared with flies provided with melezitose (trisaccharide), or to sugar‐starved flies. Fructose is not detected in sugar‐starved flies, or in flies fed glucose or trehalose. However, high levels of fructose are detected in flies fed sucrose or fructose, whereas levels of fructose in melezitose‐fed flies are intermediate. In general, significantly greater glycogen levels are detected in P. tricuspis fed sucrose, glucose, trehalose or fructose, compared with melezitose‐fed or sugar‐starved flies. Levels of total sugars and glycogen in sugar‐fed flies are positively correlated with wing length, possibly indicating a higher accumulation of storage sugars by larger flies. These results are discussed in relation to the nutritional ecology of the phorid fly.

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Physiological Entomology

Tập 31 Số 1

46-56

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