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Mothers reduce egg provisioning with age

机译:母亲随着年龄的增长而减少鸡蛋的供应

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摘要

Precise and comprehensive data on resource allocation into individual eggs are rare and this empirical void in the literature of life history strategies contrasts with the large number of theoretical studies. We show a marked decrease in reproductive investment in eggs with mother's age for egg size, sugar, protein, lipid and energy contents of eggs for a parasitic wasp. Egg size is a good predictor of offspring fitness, measured as survival of starving neonate larvae, but does not reveal possible biochemical changes. Lipids stabilize quickly at a minimal threshold while proteins and sugars decrease smoothly down to about 30% of the amount invested in the first egg. Because proteins have been highest correlation with egg size, we predict that they should be better predictors of larval fitness than lipids and sugars. Assessing the adaptive value of the observed patterns will require a multidimensional approach to egg provisioning.
机译:很少有关于将资源分配到单个卵子中的精确而全面的数据,并且这种生命史策略文献中的经验空缺与大量的理论研究形成了鲜明的对比。我们发现,随着母亲年龄的增长,寄生黄蜂的卵的生殖投资显着下降,这与母亲的年龄有关,即卵的大小,糖,蛋白质,脂质和卵的能量含量。鸡蛋大小可以很好地预测后代的健康状况,用饥饿的新生幼虫的存活率来衡量,但不能揭示可能的生化变化。脂质迅速稳定在最小限度,而蛋白质和糖类平稳下降,下降至第一个鸡蛋投入量的约30%。因为蛋白质与蛋的大小具有最高的相关性,所以我们预测它们应比脂和糖更好地预测幼虫的健康状况。评估观察到的模式的自适应值将需要多维方法来进行鸡蛋供应。

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