Evolution of character displacement in Darwin's finches
Evolution of character displacement in Darwin's finches
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DOI：
10.1126/science.1128374
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发表时间：
2006-07-14
期刊：
影响因子：
56.9
通讯作者：
Grant, B. Rosemary
中科院分区：
文献类型：
--
作者：
Grant, Peter R.;Grant, B. Rosemary
竞争物种可以对彼此产生进化影响，导致生态特征的转移;也就是说，在资源开发特征上的分歧，如下巴和喙。然而，在自然界中发生的字符位移的过程中，从最初遇到的竞争对手的进化变化，在一个或多个，以前没有被调查。在这里，我们报告说，一个达尔文的雀种（Geospiza fortis）在一个未受干扰的加拉帕戈斯岛分歧的喙大小从竞争对手的物种（G。在竞争者到来的22年后，当他们共同严重耗尽食物供应时，大喙龙（magnirostris）。观察到的进化反应自然选择是最强的记录在33年的研究，接近的值预测从高遗传喙大小。这些研究结果支持竞争的社区集会，物种形成和适应性辐射模型中的作用。
Competitor species can have evolutionary effects on each other that result in ecological character displacement; that is, divergence in resource-exploiting traits such as jaws and beaks. Nevertheless, the process of character displacement occurring in nature, from the initial encounter of competitors to the evolutionary change in one or more of them, has not previously been investigated. Here we report that a Darwin's finch species (Geospiza fortis) on an undisturbed Galapagos island diverged in beak size from a competitor species ( G. magnirostris) 22 years after the competitor's arrival, when they jointly and severely depleted the food supply. The observed evolutionary response to natural selection was the strongest recorded in 33 years of study, and close to the value predicted from the high heritability of beak size. These findings support the role of competition in models of community assembly, speciation, and adaptive radiations.