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Longevity-fertility trade-offs in the tephritid fruit fly, Anastrepha ludens, across dietary-restriction gradients

Carey, James R [autor] | Harshman, Lawrence [autor] | Liedo Fernández, Pablo [autor] | Müller, Hans Georg [autor] | Wang, Jane Ling [autor] | Zhang, Zhen [autor].
Tipo de material: Artículo en línea Artículo en línea Tema(s): Moscas de la fruta | Dietas restrictas en energía | Longevidad | Reproducción de insectosTema(s) en inglés: Fruit flies | Energy restricted diets | Longevity | Insect reproductionNota de acceso: Acceso en línea sin restricciones En: Aging Cell. volumen 7, número 4 (August 2008), páginas 470-477. --ISSN: 1474-9726Número de sistema: 7141Resumen:
Inglés

Although it is widely known that dietary restriction (DR) not only extends the longevity of a wide range of species but also reduces their reproductive output, the interrelationship of DR, longevity-extension and reproduction is not well understood in any organism. Here we address the question: "Under what nutritional conditions do the longevity-enhancing effects resulting from food restriction either counteract, complement or reinforce the mortality costs of reproduction? To answer this question we designed a fine-grained DR study involving 4,800 individuals of the tephritid fruit fly Anastrepha ludens in which we measured sex-specific survival and daily reproduction in females in each of 20 different treatments (sugar:yeast ratios) plus 4 starvation controls. The database generated from this 3-year study consisted of approximately 100,000 life-days for each sex and 750,000 eggs distributed over the reproductive lives of 2,400 females. The fertility and longevity-extending responses were used to create contour maps (X-Y grid) that show the demographic responses (Z-axis) across dietary gradients that range from complete starvation to both ad libitum sugar-only and ad libitum standard diet (3:1 sugar-to-yeast). The topographic perspectives reveal demographic equivalencies along nutritional gradients, differences in the graded responses of males and females, egg production costs that are sensitive to the interaction of food amounts and constituents, and orthogonal contours (equivalencies in longevity or reproduction) representing demographic thresholds related to both caloric content and sugar-yeast ratios. If general, the finding that lifespan and reproductive maxima occur at much different nutritional coordinates poses a major challenge for the use of food restriction (or a mimetic) in humans to improve health and extend longevity in humans.

Recurso en línea: http://onlinelibrary.wiley.com/doi/10.1111/j.1474-9726.2008.00389.x/pdf
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Acceso en línea sin restricciones

Although it is widely known that dietary restriction (DR) not only extends the longevity of a wide range of species but also reduces their reproductive output, the interrelationship of DR, longevity-extension and reproduction is not well understood in any organism. Here we address the question: "Under what nutritional conditions do the longevity-enhancing effects resulting from food restriction either counteract, complement or reinforce the mortality costs of reproduction? To answer this question we designed a fine-grained DR study involving 4,800 individuals of the tephritid fruit fly Anastrepha ludens in which we measured sex-specific survival and daily reproduction in females in each of 20 different treatments (sugar:yeast ratios) plus 4 starvation controls. The database generated from this 3-year study consisted of approximately 100,000 life-days for each sex and 750,000 eggs distributed over the reproductive lives of 2,400 females. The fertility and longevity-extending responses were used to create contour maps (X-Y grid) that show the demographic responses (Z-axis) across dietary gradients that range from complete starvation to both ad libitum sugar-only and ad libitum standard diet (3:1 sugar-to-yeast). The topographic perspectives reveal demographic equivalencies along nutritional gradients, differences in the graded responses of males and females, egg production costs that are sensitive to the interaction of food amounts and constituents, and orthogonal contours (equivalencies in longevity or reproduction) representing demographic thresholds related to both caloric content and sugar-yeast ratios. If general, the finding that lifespan and reproductive maxima occur at much different nutritional coordinates poses a major challenge for the use of food restriction (or a mimetic) in humans to improve health and extend longevity in humans. eng

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