Testing the effect of early-life reproductive effort on age-related decline in a wild insect.
Testing the effect of early-life reproductive effort on age-related decline in a wild insect.
复制标题
测试生命早期繁殖努力对野生昆虫与年龄相关的衰退的影响。
DOI：
10.1111/evo.13679
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Rodríguez-Muñoz R
中科院分区：
文献类型：
--
作者：
Rodríguez-Muñoz R
衰老的可抛弃索马理论预测，当生物体投资于繁殖时，它们会减少对身体保养的投资，从而在繁殖和生存之间进行权衡。在实验室中对无脊椎动物的实验通过展示对生殖努力或寿命的操纵的预测反应来支持该理论。然而，在鸟类中的实验研究和自然界中观察性（非操纵性）研究的证据并不总是揭示权衡。之前在野外研究的大多数物种都是哺乳动物和鸟类，它们在多个不连续的季节中繁殖。这与温带无脊椎动物形成鲜明对比，温带无脊椎动物通常每年繁殖一次，在一个季节内繁殖。我们扩大了衰老研究系统的分类范围，包括大多数温带无脊椎动物的典型生活史。我们监测了十多年的自然田野蟋蟀种群的生殖努力，衰老和生存情况，以检验对早期生殖投资更多的个体衰老得更快，死得更早的预测。我们没有发现早期生命的繁殖努力和生存之间的权衡的证据，只有微弱的证据与表型衰老的权衡。我们讨论的可能性，生物体与多个离散的繁殖季节可能有更大的机会来表达繁殖和衰老之间的权衡。
The disposable soma theory of ageing predicts that when organisms invest in reproduction they do so by reducing their investment in body maintenance, inducing a trade-off between reproduction and survival. Experiments on invertebrates in the lab provide support for the theory by demonstrating the predicted responses to manipulation of reproductive effort or lifespan. However, experimental studies in birds and evidence from observational (nonmanipulative) studies in nature do not consistently reveal trade-offs. Most species studied previously in the wild are mammals and birds that reproduce over multiple discrete seasons. This contrasts with temperate invertebrates, which typically have annual generations and reproduce over a single season. We expand the taxonomic range of senescence study systems to include life histories typical of most temperate invertebrates. We monitored reproductive effort, ageing, and survival in a natural field cricket population over ten years to test the prediction that individuals investing more in early-reproduction senesce faster and die younger. We found no evidence of a trade-off between early-life reproductive effort and survival, and only weak evidence for a trade-off with phenotypic senescence. We discuss the possibility that organisms with multiple discrete breeding seasons may have greater opportunities to express trade-offs between reproduction and senescence.