Avendaño Jorge Enrique, Arbeláez-Cortés Enrique, Cadena Carlos Daniel
Laboratorio de Biología Evolutiva de Vertebrados, Departamento de Ciencias Biológicas, Universidad de los Andes, Bogotá, Colombia.
Colección de Tejidos, Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Palmira, Colombia; Grupo de Estudios en Biodiversidad, Escuela de Biología, Facultad de Ciencias, Universidad Industrial de Santander, Bucaramanga, Colombia.
Mol Phylogenet Evol. 2017 Jun;111:87-97. doi: 10.1016/j.ympev.2017.03.020. Epub 2017 Mar 24.
Phylogeographic studies seeking to describe biogeographic patterns, infer evolutionary processes, and revise species-level classification should properly characterize the distribution ranges of study species, and thoroughly sample genetic variation across taxa and geography. This is particularly necessary for widely distributed organisms occurring in complex landscapes, such as the Neotropical region. Here, we clarify the geographic range and revisit the phylogeography of the Black-billed Thrush (Turdus ignobilis), a common passerine bird from lowland tropical South America, whose evolutionary relationships and species limits were recently evaluated employing phylogeographic analyses based on partial knowledge of its distribution and incomplete sampling of populations. Our work employing mitochondrial and nuclear DNA sequences sampled all named subspecies and multiple populations across northern South America, and uncovered patterns not apparent in earlier work, including a biogeographic interplay between the Amazon and Orinoco basins and the occurrence of distinct lineages with seemingly different habitat affinities in regional sympatry in the Colombian Amazon. In addition, we found that previous inferences about the affinities and taxonomic status of Andean populations assumed to be allied to populations from the Pantepui region were incorrect, implying that inferred biogeographic and taxonomic scenarios need re-evaluation. We propose a new taxonomic treatment, which recognizes two distinct biological species in the group. Our findings illustrate the importance of sufficient taxon and geographic sampling to reconstruct evolutionary history and to evaluate species limits among Neotropical organisms. Considering the scope of the questions asked, advances in Neotropical phylogeography will often require substantial cross-country scientific collaboration.
旨在描述生物地理格局、推断进化过程以及修订物种水平分类的系统发育地理学研究，应恰当地描述研究物种的分布范围，并全面采样跨分类群和地理区域的遗传变异。对于出现在复杂景观中的广泛分布的生物，如新热带地区的生物，这一点尤为必要。在此，我们明确了黑嘴鸫（Turdus ignobilis）的地理分布范围，并重新审视了其系统发育地理学，黑嘴鸫是一种来自南美洲低地热带地区的常见雀形目鸟类，其进化关系和物种界限最近基于对其分布的部分了解和种群采样不完整进行了系统发育地理学分析评估。我们利用线粒体和核DNA序列的研究对南美洲北部所有命名的亚种和多个种群进行了采样，发现了早期研究中未显现的模式，包括亚马逊河和奥里诺科河流域之间的生物地理相互作用，以及在哥伦比亚亚马逊地区区域同域分布中出现的具有看似不同栖息地亲和力的不同谱系。此外，我们发现之前关于安第斯种群与潘塔纳尔地区种群亲缘关系及分类地位的推断是错误的，这意味着推断的生物地理和分类学情景需要重新评估。我们提出了一种新的分类处理方法，该方法在该类群中识别出两个不同的生物物种。我们的研究结果说明了足够的分类群和地理采样对于重建进化历史以及评估新热带生物物种界限的重要性。考虑到所提出问题的范围，新热带系统发育地理学的进展往往需要大量的跨国科学合作。
