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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Evolution Under Dietary Restriction Decouples Survival From Fecundity in Drosophila melanogaster Females
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Evolution Under Dietary Restriction Decouples Survival From Fecundity in Drosophila melanogaster Females

机译：饮食限制下的演变与果蝇黑素糖蛋白运动员雌雄同体的生存

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One of the key tenets of life-history theory is that reproduction and survival are linked and that they trade-off with each other. When dietary resources are limited, reduced reproduction with a concomitant increase in survival is commonly observed. It is often hypothesized that this dietary restriction effect results from strategically reduced investment in reproduction in favor of somatic maintenance to survive starvation periods until resources become plentiful again. We used experimental evolution to test this "waiting-for-the-good-times" hypothesis, which predicts that selection under sustained dietary restriction will favor increased investment in reproduction at the cost of survival because "good-times" never come. We assayed fecundity and survival of female Drosophila melanogaster fruit flies that had evolved for 50 generations on three different diets varying in protein content-low (classic dietary restriction diet), standard, and high-in a full-factorial design. High-diet females evolved overall increased fecundity but showed reduced survival on low and standard diets. Low-diet females evolved reduced survival on low diet without corresponding increase in reproduction. In general, there was little correspondence between the evolution of survival and fecundity across all dietary regimes. Our results contradict the hypothesis that resource reallocation between fecundity and somatic maintenance underpins life span extension under dietary restriction.
机译：生命历史理论的关键原则之一是繁殖和生存链接，它们彼此交易。当膳食资源有限时，通常观察到减少繁殖的存活增加。通常假设这种饮食限制效应从战略性降低的繁殖投资中产生了繁殖，以便在饥饿期内生存，直到资源再次变得丰富。我们使用实验演变来测试这一“等待 - 愉快的时期”假设，这预测了在持续饮食限制下的选择将有利于在生存成本上增加繁殖的投资，因为“好时报”永远不会来。我们在蛋白质含量低（经典饮食限制饮食），标准和高度全面设计的三种不同饮食中，在不同的饮食中进行了50代的雌性果蝇的果蝇的繁殖力和生存。高饮食女性进化总体增加了繁殖力，但表现出降低的饮食中的存活率降低。低饮食女性在低饮食中进化了降低的生存，而不会相应地增加再现。一般而言，在所有饮食制度的生存和繁殖力的演变之间几乎没有对应。我们的结果与饮食限制下的繁殖力和体重维护之间的资源重新分配的假设相矛盾。

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