As a dispersive lineage expands its distribution across a heterogeneous landscape, it leaves behind allopatric populations with varying degrees of geographic isolation that often differentiate rapidly. In the case of oceanic islands, even narrowly separated populations often differentiate, which seems contrary to the highly dispersive nature of the founding lineage. This pattern of highly dispersive lineages differentiating across narrow sea barriers has perplexed biologists for more than a century. We used two reduced-representation genomic datasets to examine the diversification of a recent, rapid geographic radiation, the white-eyes (Aves: Zosterops) of the Solomon Islands. We incorporated methods that targeted phylogenetic structure, population structure, and explicit tests for gene flow. Both data sets showed evidence of gene flow among species, but not involving the closely spaced islands in the New Georgia Group. Instead, gene flow has occurred among the larger islands in the archipelago, including those recently connected by land bridges as well as those isolated by large expanses of deep ocean. Populations separated by shallow seas, and connected by land bridges during glacial cycles, ranged from no differentiation to both phenotypic and genomic differentiation. These complex patterns of gene flow and divergence support a model of rapid geographic radiation in which lineages differentially evolve dispersal disparity and phenotypic differences. This article is protected by copyright. All rights reserved.

中文翻译：

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基因流动和快速分化表征西南太平洋的快速岛屿辐射（Aves：Zosterops）

随着分散的谱系在异质景观中扩展其分布，它留下了具有不同地理隔离程度的异域种群，这些种群通常迅速分化。在海洋岛屿的情况下，即使是狭隘分离的种群也经常发生分化，这似乎与创始世系的高度分散性质相反。一个多世纪以来，这种跨越狭窄海障的高度分散的谱系模式一直困扰着生物学家。我们使用两个减少表示的基因组数据集来检查最近快速地理辐射的多样化，即​​所罗门群岛的白眼（Aves：Zosterops）。我们结合了针对系统发育结构、种群结构和基因流显式测试的方法。两个数据集都显示了物种间基因流动的证据，但不涉及新乔治亚群中间隔很近的岛屿。相反，基因流发生在群岛中较大的岛屿之间，包括最近通过陆桥连接的岛屿以及被大片深海隔离的岛屿。被浅海隔开并在冰川循环期间通过陆桥连接的种群，范围从无分化到表型和基因组分化。这些复杂的基因流动和分化模式支持快速地理辐射模型，在该模型中，谱系不同地演化出分散差异和表型差异。本文受版权保护。版权所有。群岛中较大的岛屿之间发生了基因流动，包括最近通过陆桥连接的岛屿以及被大片深海隔离的岛屿。被浅海隔开并在冰川循环期间通过陆桥连接的种群，范围从无分化到表型和基因组分化。这些复杂的基因流动和分化模式支持快速地理辐射模型，在该模型中，谱系不同地演化出分散差异和表型差异。本文受版权保护。版权所有。群岛中较大的岛屿之间发生了基因流动，包括最近通过陆桥连接的岛屿以及被大片深海隔离的岛屿。被浅海隔开并在冰川循环期间通过陆桥连接的种群，范围从无分化到表型和基因组分化。这些复杂的基因流动和分化模式支持快速地理辐射模型，在该模型中，谱系不同地演化出分散差异和表型差异。本文受版权保护。版权所有。范围从无分化到表型和基因组分化。这些复杂的基因流动和分化模式支持快速地理辐射模型，在该模型中，谱系不同地演化出分散差异和表型差异。本文受版权保护。版权所有。范围从无分化到表型和基因组分化。这些复杂的基因流动和分化模式支持快速地理辐射模型，在该模型中，谱系不同地演化出分散差异和表型差异。本文受版权保护。版权所有。