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Predicting adult lifespan and lifetime reproductive success from early-life reproductive events

机译：从早期生殖事件预测成人寿命和终身生殖成功

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摘要

Fitness is a product of survival and fecundity, which arise from a host of individual traits that vary among individuals. Estimating fitness is central to many research programs in ecology and evolution. Yet, because researchers are rarely able to track individuals through a complete lifetime, they typically rely on proxies of reproductive success. Because it can be readily measured, the number of offspring produced at first reproduction has been used as a proxy for fitness in some studies, including some on the marine copepodTigriopus californicus. However, to date, no validation of the accuracy of this metric has been completed. We tracked the lifetime reproductive success ofT. californicusmothers to test whether the number of offspring in a mother's first clutch is a reliable indicator of lifetime reproductive success. We used a repeated measures design to quantify variation in reproductive metrics among individual mothers and within each mother across her lifetime. We found positive associations between first clutch size, adult lifespan, and lifetime reproductive success. We detected negative effects on clutch size, offspring body size and offspring survival due to aging and the increase in reproductive bouts over time. Finally, we observed a trade-off between clutch size and offspring body size. These results indicate that first clutch size is a good predictor of lifetime reproductive success and may serve as a suitable fitness proxy inT. californicuscopepods. The observed decline in female reproductive traits over time may underscore an emphasis on early reproduction due to the variable conditions this species endures in the wild or, alternatively, may result from resource limitations imparted on females that must mate only once per lifetime.
机译：健身是一种生存和繁殖力的产物，它来自一系列各自的个体特征。估算健身是生态和演化中许多研究计划的核心。然而，因为研究人员很少能够通过完整的寿命来跟踪个人，他们通常依赖于生殖成功的代理。因为可以容易地测量，首次再现产生的后代的数量已被用作一些研究中的适用性的代理，包括一些在海洋蛋白酶蛋白酶上的一些研究。但是，迄今为止，没有完成对该度量标准的准确性的验证。我们履行了终身生殖成功。加州大学/母亲测试母亲的第一个离合器中的后代数量是否是终身生殖成功的可靠指标。我们使用了一项重复的措施设计来量化各个母亲的生殖指标的变化，以及在她的一生中的每个母亲内。我们发现了第一个离合器大小，成人寿命和终身生殖成功之间的积极协会。我们检测对离合器尺寸，后代体尺寸和后代存活率的负面影响，并且随着时间的推移随着时间的推移增加生殖回应。最后，我们观察了离合器尺寸和后代体型之间的权衡。这些结果表明，第一离合器尺寸是寿命生殖成功的良好预测因子，并且可以用作合适的健身代理int。 Californicuscopopods。由于这种物种在野外的可变条件，或者，或者，可能是由于在野外的资源限制可能导致必须在每一生中施加一次的资源限制可能导致必须施加一次的雌性的资源限制，因此观察到的女性生殖特性可能强调早期繁殖。

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  • 来源
    《Marine biology》 |2020年第10期|147.1-147.11|共11页
  • 作者

    Powers Matthew J.; Weaver Ryan J.; Heine Kyle B.; Hill Geoffrey E.;

  • 作者单位

    Auburn Univ Dept Biol Sci 156 Funchess Hall Auburn AL 36849 USA;

    Auburn Univ Dept Biol Sci 156 Funchess Hall Auburn AL 36849 USA|Univ Texas Austin Dept Integrat Biol Austin TX 78712 USA;

    Auburn Univ Dept Biol Sci 156 Funchess Hall Auburn AL 36849 USA;

    Auburn Univ Dept Biol Sci 156 Funchess Hall Auburn AL 36849 USA;

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