Eco‐evolutionary feedback promotes Red Queen dynamics and selects for sex in predator populations
Eco‐evolutionary feedback promotes Red Queen dynamics and selects for sex in predator populations
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生态进化反馈促进红皇后动态并在捕食者群体中选择性别
DOI：
10.1111/evo.12885
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发表时间：
2016
期刊：
影响因子：
3.3
通讯作者：
L. Becks
中科院分区：
文献类型：
--
作者：
Haafke;Abou Chakra;L. Becks
尽管存在许多假设来解释生命之树上压倒性的有性繁殖现象，但考虑到所有涉及的内在成本，我们仍然不能解释这种现象的普遍存在。红皇后假说认为，有性行为之所以得以维持，是因为它可以创造出具有选择性优势的新的基因类型。当物种之间的相互作用导致频繁的环境变化时，就会发生这种情况。在这里，我们研究了捕食者-食饵系统中的协同进化和生态进化反馈动力学是否允许捕食者间接选择和维持有性繁殖。结合轮虫-藻类系统的模型和恒化器实验，我们证明了种群和性状变化之间的持续反馈，以及从捕食和竞争有限资源的选择的循环转移。我们发现，在包含这些生态进化动态的环境中，轮虫种群中间接选择并保持着高的性取向；而在恒定条件下的环境中，捕食者迅速进化到较低的性行为水平。因此，我们的结果表明，生态进化反馈动力学对整体进化变化的影响被低估了。
Although numerous hypotheses exist to explain the overwhelming presence of sexual reproduction across the tree of life, we still cannot explain its prevalence when considering all inherent costs involved. The Red Queen hypothesis states that sex is maintained because it can create novel genotypes with a selective advantage. This occurs when the interactions between species induce frequent environmental change. Here, we investigate whether coevolution and eco-evolutionary feedback dynamics in a predator-prey system allows for indirect selection and maintenance of sexual reproduction in the predator. Combining models and chemostat experiments of a rotifer-algae system we show a continuous feedback between population and trait change along with recurrent shifts from selection by predation and competition for a limited resource. We found that a high propensity for sex was indirectly selected and was maintained in rotifer populations within environments containing these eco-evolutionary dynamics; whereas within environments under constant conditions, predators evolved rapidly to lower levels of sex. Thus, our results indicate that the influence of eco-evolutionary feedback dynamics on the overall evolutionary change has been underestimated.