Archipelago-Wide Patterns of Colonization and Speciation Among an Endemic Radiation of Galápagos Land Snails
Archipelago-Wide Patterns of Colonization and Speciation Among an Endemic Radiation of Galápagos Land Snails
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加拉帕戈斯陆地蜗牛地方性辐射中全群岛的定殖和物种形成模式
DOI：
10.1093/jhered/esz068
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发表时间：
2019
影响因子：
3.1
通讯作者：
Gillespie, Rosemary
中科院分区：
文献类型：
--
作者：
Phillips, John G;Linscott, T Mason;Rankin, Andrew M;Kraemer, Andrew C;Shoobs, Nathaniel F;Parent, Christine E;Gillespie, Rosemary
与大陆上的原始种群相比，年轻或偏远岛屿上新抵达的物种可能会遇到更少的捕食和竞争。相关的生态释放可能会促进物种的分化和物种形成，因为殖民血统填补了以前空置的生态位空间。确定在岛屿上殖民的顺序和时间是确定地理隔离和生态因素对谱系多样化的相对贡献的第一步。在这里，我们使用基因组规模的数据来估计从南美洲大陆到加拉帕戈斯群岛的Naesiotus蜗牛的殖民时间。我们测试岛间的殖民模式和岛内辐射，以了解它们对社区集会的贡献。与之前发表的拓扑结构部分矛盾的是，系统发育重建表明，大多数Naesiotus物种形成了岛屿特有的分支，岛屿内的物种形成主导着分支形成。加拉帕戈斯-纳埃西奥图斯也坚持岛屿递进规则，从老岛屿到年轻岛屿的殖民进程和岛屿内多样化较早发生在较老的岛屿上。我们的工作为评估殖民和原位物种形成对其他加拉帕戈斯血统多样性的贡献提供了一个框架。
Newly arrived species on young or remote islands are likely to encounter less predation and competition than source populations on continental landmasses. The associated ecological release might facilitate divergence and speciation as colonizing lineages fill previously unoccupied niche space. Characterizing the sequence and timing of colonization on islands represents the first step in determining the relative contributions of geographical isolation and ecological factors in lineage diversification. Herein, we use genome-scale data to estimate timing of colonization inNaesiotussnails to the Galápagos islands from mainland South America. We test inter-island patterns of colonization and within-island radiations to understand their contribution to community assembly. Partly contradicting previously published topologies, phylogenetic reconstructions suggest that mostNaesiotusspecies form island-specific clades, with within-island speciation dominating cladogenesis. GalápagosNaesiotusalso adhere to the island progression rule, with colonization proceeding from old to young islands and within-island diversification occurring earlier on older islands. Our work provides a framework for evaluating the contribution of colonization and in situ speciation to the diversity of other Galápagos lineages.