MacGuigan Daniel J, Geneva Anthony J, Glor Richard E
Department of Ecology and Evolutionary Biology Yale University New Haven CT USA.
Department of Organismic and Evolutionary Biology Harvard University Cambridge MA USA.
Ecol Evol. 2017 Apr 15;7(11):3657-3671. doi: 10.1002/ece3.2751. eCollection 2017 Jun.
Delimiting young species is one of the great challenges of systematic biology, particularly when the species in question exhibit little morphological divergence. , a trunk anole with more than a dozen subspecies that are defined primarily by dewlap color, may actually represent several independent evolutionary lineages. To test this, we utilized amplified fragment length polymorphisms (AFLP) genome scans and genetic clustering analyses in conjunction with a coalescent-based species delimitation method. We examined a geographically widespread set of samples and two heavily sampled hybrid zones. We find that genetic divergence is associated with a major biogeographic barrier, the Hispaniolan paleo-island boundary, but not with dewlap color. Additionally, we find support for hypotheses regarding colonization of two Hispaniolan satellite islands and the Bahamas from mainland Hispaniola. Our results show that is composed of seven distinct evolutionary lineages still experiencing a limited degree of gene flow. We suggest that merits taxonomic revision, but that dewlap color cannot be relied upon as the primary diagnostic character.
界定年轻物种是系统生物学面临的重大挑战之一，尤其是当相关物种在形态上几乎没有差异时。例如，一种有十几个主要由喉扇颜色定义的亚种的树干安乐蜥，实际上可能代表了几个独立的进化谱系。为了验证这一点，我们结合基于溯祖的物种界定方法，利用扩增片段长度多态性（AFLP）基因组扫描和遗传聚类分析。我们检查了一组地理分布广泛的样本以及两个采样密集的杂交区域。我们发现遗传分化与一个主要的生物地理屏障——伊斯帕尼奥拉古岛边界有关，而与喉扇颜色无关。此外，我们发现了关于从伊斯帕尼奥拉岛大陆殖民到两个伊斯帕尼奥拉卫星岛和巴哈马群岛的假设的证据。我们的结果表明，该物种由七个不同的进化谱系组成，它们仍经历着有限程度的基因流动。我们建议该物种值得进行分类修订，但不能将喉扇颜色作为主要的诊断特征。
