Founder-effect speciation theory: failure of experimental corroboration.
Founder-effect speciation theory: failure of experimental corroboration.
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创始人效应物种形成理论：实验佐证的失败。
DOI：
10.1073/pnas.92.9.3983
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发表时间：
1995
影响因子：
11.1
通讯作者：
Ayala,FJ
中科院分区：
文献类型：
--
作者：
Moya,A;Galiana,A;Ayala,FJ
创始人效应物种形成理论认为，极少数个体在空旷的栖息地定居有利于快速的遗传变化和新物种的进化。我们在这里报道了一项长达10年的大规模果蝇实验的结果，该实验旨在验证这一理论。在我们的实验协议中，建立的种群数量可变，个体数量很少，并允许几代人大幅扩张，直到达到对资源的激烈竞争条件，种群崩溃。然后，一些随机的幸存者被带去开始新的人口扩张，从而启动了一个新的创建事件、人口激增和崩溃的周期。我们的结果不支持新物种很可能作为创始人事件的副产品出现的理论。
The theory of founder-effect speciation proposes that colonization by very few individuals of an empty habitat favors rapid genetic changes and the evolution of a new species. We report here the results obtained in a 10-year-long and large-scale experiment with Drosophila pseudoobscura designed to test the theory. In our experimental protocol, populations are established with variable numbers of very few individuals and allowed to expand greatly for several generations until conditions of severe competition for resources are reached and the population crashes. A few random survivors are then taken to start a new population expansion and thus initiate a new cycle of founding events, population flushes, and crashes. Our results provide no support for the theories proposing that new species are very likely to appear as by-products of founder events.