Rundle Howard D, Mooers Arne Ø, Whitlock Michael C
Department of Zoology and Centre for Biodiversity Research, University of British Columbia, Vancouver, British Columbia, V6T 1Z4, Canada.
Evolution. 1998 Dec;52(6):1850-1855. doi: 10.1111/j.1558-5646.1998.tb02263.x.
By demonstrating the evolution of significant premating isolation, previous laboratory experiments have provided some evidence for the founder-flush model of speciation. However, these experiments are subject to a number of criticisms, including the use of hybrid populations recently collected from the wild and the use of multiple bottlenecks. Here we present the results of a test of founder-flush speciation using a single, well-adapted laboratory stock of Drosophila melanogaster subjected to one founder-flush event. The experiment was replicated at larger scale than previous studies, and results indicate that none of 50 independent founder-flush lines evolved significant assortative mating relative to the control (base) population. This suggests a diminished emphasis on population bottlenecks in speciation of D. melanogaster and perhaps in general.
通过展示显著的交配前隔离的演变，先前的实验室实验为物种形成的奠基者-扩张模型提供了一些证据。然而，这些实验受到了一些批评，包括使用最近从野外收集的杂交种群以及使用多个瓶颈。在这里，我们展示了一项使用单一、适应良好的实验室黑腹果蝇种群进行一次奠基者-扩张事件的物种形成测试结果。该实验的规模比先前的研究更大，结果表明，相对于对照（基础）种群，50个独立的奠基者-扩张系中没有一个进化出显著的选型交配。这表明在黑腹果蝇的物种形成中，或许一般情况下，对种群瓶颈的重视程度有所降低。
