Archipelagic genetics in a widespread Caribbean anole

Aim We examine the influence of fluctuating sea levels in a land-bridge archipelago on the apportioning of intraspecific genetic diversity and divergence in the widespread Puerto Rican crested anole (Anolis cristatellus). We compare three alternative scenarios for genetic diversification in an archipelagic species that contrast the relative influences of periodic isolation versus island connectedness driven by fluctuating sea levels. Our approach combines information from geography and population genetics to assess the influence of island size, island isolation, island historical geography, and population genetic processes such as drift on the contemporary distribution of genetic variation within and among islands. Location The Puerto Rico Bank in the Caribbean focusing primarily on the Spanish, British and U.S. Virgin Islands. Methods We used nuclear and mitochondrial DNA sequences and microsatellite genotypes sampled from A. cristatellus populations to investigate: 1) the broad-scale ...

研究目的：本研究旨在探讨陆桥群岛的海平面波动，对广布物种波多黎各冠安乐蜥（Anolis cristatellus）的种内遗传多样性分配与种群分化的影响。我们针对群岛物种种群的遗传多样化模式，对比三种备选情景，以厘清海平面波动驱动的周期性岛屿隔离与岛屿连通性二者的相对影响。本研究结合地理学与种群遗传学信息，评估岛屿面积、岛屿隔离程度、岛屿历史地理格局，以及遗传漂变等种群遗传过程，对岛屿内部及岛屿间当代遗传变异分布的影响。研究区域：加勒比海的波多黎各海台，主要聚焦于西班牙维尔京群岛、英国维尔京群岛与美属维尔京群岛。研究方法：我们采用采自A. cristatellus种群的核DNA序列、线粒体DNA序列以及微卫星基因型，开展如下研究：1）大尺度……