Quantifying the complexities of Saccharomyces cerevisiae's ecosystem engineering via fermentation
Quantifying the complexities of Saccharomyces cerevisiae's ecosystem engineering via fermentation
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DOI：
10.1890/07-2060.1
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发表时间：
2008-08-01
期刊：
影响因子：
4.8
通讯作者：
Goddard, Matthew R.
中科院分区：
文献类型：
--
作者：
Goddard, Matthew R.
生态位构建理论认为，生物可以通过它们的活动来改造环境。尽管达尔文意识到了这种现象的潜力，但生态位构建将生态学和进化生物学统一起来的能力从未被经验量化。在这里，我量化的健身效果酿酒酵母的生态系统工程在自然发酵，以了解生态和进化过程之间的相互作用。我证明了S。酿酒酵母最终在水果小生境中占据主导地位，在那里它最初是自然稀少的，通过发酵（克拉布特里效应）以超越仅仅考虑乙醇生产的方式改变环境。这些数据表明，S.酿酒酵母的竞争优势超过其他酵母在社区是由于生产的热量通过发酵。尽管发酵的能量效率不如呼吸，但似乎这种特性被选中是因为它的净效应提供了比群落其他成员大约7%的适应性优势。这些数据为生态位的构建提供了一个很好的例子，因为这种特性明显地改变了环境，从而改变了S。酿酒酵母和其他获得水果资源的生物体，包括人类，都暴露于其中。
The theory of niche construction suggests that organisms may engineer environments via their activities. Despite the potential of this phenomenon being realized by Darwin, the capability of niche construction to generally unite ecological and evolutionary biology has never been empirically quantified. Here I quantify the fitness effects of Saccharomyces cerevisiae's ecosystem engineering in a natural ferment in order to understand the interaction between ecological and evolutionary processes. I show that S. cerevisiae eventually dominates in fruit niches, where it is naturally initially rare, by modifying the environment through fermentation (the Crabtree effect) in ways which extend beyond just considering ethanol production. These data show that an additional cause of S. cerevisiae's competitive advantage over the other yeasts in the community is due to the production of heat via fermentation. Even though fermentation is less energetically efficient than respiration, it seems that this trait has been selected for because its net effect provides roughly a 7% fitness advantage over the other members of the community. These data provide an elegant example of niche construction because this trait clearly modifies the environment and therefore the selection pressures to which S. cerevisiae, and other organisms that access the fruit resource, including humans, are exposed to.