Competition between species can stabilize public-goods cooperation within a species.
Competition between species can stabilize public-goods cooperation within a species.
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DOI：
10.1038/msb.2012.54
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发表时间：
2012
影响因子：
9.9
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中科院分区：
文献类型：
--
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物种之间的竞争是推动进化的主要生态力量。在这里，我们测试这种力量对物种内部合作进化的影响。我们使用蔗糖代谢的芽殖酵母，酿酒酵母，作为一个模型的合作系统，受到社会寄生的骗子策略。我们发现，当与细菌的竞争对手，大肠杆菌，酵母菌群中的合作者表型的频率显着增加相比，孤立的酵母菌群。细菌竞争通过限制酵母菌群密度以及消耗合作酵母细胞产生的公共产品来稳定酵母菌内的合作。这两个变化引起的细菌竞争增加合作者的频率，因为合作者酵母细胞有一个小的优先访问他们生产的公共产品，这种优先访问变得更加重要时，公共产品是稀缺的。我们的研究结果表明，物种相互作用的透彻理解是至关重要的解释在自然界中的合作的维护和进化。
Competition between species is a major ecological force that can drive evolution. Here, we test the effect of this force on the evolution of cooperation within a species. We use sucrose metabolism of budding yeast, Saccharomyces cerevisiae, as a model cooperative system that is subject to social parasitism by cheater strategies. We find that when cocultured with a bacterial competitor, Escherichia coli, the frequency of cooperator phenotypes in yeast populations increases dramatically as compared with isolated yeast populations. Bacterial competition stabilizes cooperation within yeast by limiting the yeast population density and also by depleting the public goods produced by cooperating yeast cells. Both of these changes induced by bacterial competition increase the cooperator frequency because cooperator yeast cells have a small preferential access to the public goods they produce; this preferential access becomes more important when the public good is scarce. Our results indicate that a thorough understanding of species interactions is crucial for explaining the maintenance and evolution of cooperation in nature.