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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Speciation with gene flow on Lord Howe Island
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Speciation with gene flow on Lord Howe Island

机译：豪勋爵岛上具有基因流的物种

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摘要

Understanding the processes underlying the origin of species is a fundamental goal of biology. It is widely accepted that speciation requires an interruption of gene flow between populations: ongoing gene exchange is considered a major hindrance to population divergence and, ultimately, to the evolution of new species. Where a geographic barrier to reproductive isolation is lacking, a biological mechanism for speciation is required to counterbalance the homogenizing effect of gene flow. Speciation with initially strong gene flow is thought to be extremely rare, and few convincing empirical examples have been published. However, using phylogenetic, karyological, and ecological data for the flora of a minute oceanic island (Lord Howe Island, LHI), we demonstrate that speciation with gene flow may, in fact, be frequent in some instances and could account for one in five of the endemic plant species of LHI. We present 11 potential instances of species divergence with gene flow, including an in situ radiation of five species of Coprosma (Rubiaceae, the coffee family). These results, together with the speciation of Howea palms on LHI, challenge current views on the origin of species diversity.
机译：了解物种起源的过程是生物学的基本目标。物种形成需要中断种群之间的基因流动，这一点已被广泛接受：正在进行的基因交换被认为是种群差异以及最终阻碍新物种进化的主要障碍。在缺乏生殖隔离的地理障碍的地方，需要一种用于物种形成的生物学机制来抵消基因流的均质化作用。最初具有强大基因流的物种被认为是极为罕见的，很少有令人信服的经验例子被发表。但是，使用有关微小海洋岛屿（豪勋爵岛，LHI）植物区系的系统发育，核物理和生态学数据，我们证明，在某些情况下，与基因流的物种形成实际上可能很常见，并且可能占五分之一LHI的特有植物种类。我们介绍了11种潜在的物种随基因流发生变化的情况，包括对5种Coprosma（菊科，咖啡家族）的原位辐射。这些结果，加上Howea棕榈在LHI上的物种形成，挑战了当前对物种多样性起源的看法。

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