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Phylogeography of the Variable Antshrike (Thamnophilus caerulescens), a South American passerine distributed along multiple environmental gradients.
Molecular Phylogenetics and Evolution ( IF 4.1 ) Pub Date : 2020-04-05 , DOI: 10.1016/j.ympev.2020.106810
Sergio D Bolívar-Leguizamón 1 , Luís F Silveira 1 , Elizabeth P Derryberry 2 , Robb T Brumfield 3 , Gustavo A Bravo 4
Affiliation  

The Neotropics show a wealth of distributional patterns shared by many co-distributed species. A distinctive pattern is the so-called "circum-Amazonian distribution," which is observed in species that do not occur in Amazonia but rather along a belt of forested habitats spanning south and east of Amazonia, the Andean foothills, and often into the Venezuelan Coastal Range and the Tepuis. Although this pattern is widespread across animals and plants, its underlying biogeographic mechanisms remain poorly understood. The Variable Antshrike (Thamnophilus caerulescens) is a sexually dimorphic suboscine passerine that exhibits extreme plumage variation and occurs along the southern portion of the circum-Amazonian belt. We describe broad-scale phylogeographic patterns of T. caerulescens and assess its demographic history using DNA sequences from the mitochondrion and ultraconserved elements (UCEs). We identified three genomic clusters: a) northern Atlantic Forest; b) southeastern Cerrado and central-southern Atlantic Forest, and c) Chaco and Andes. Our results were consistent with Pleistocene divergence followed by gene flow, mainly between the latter two clusters. There were no genetic signatures of rapid population expansions or bottlenecks. The population from the northern Atlantic Forest was the most genetically divergent group within the species. The demographic history of T. caerulescens was probably affected by series of humid and dry periods throughout the Quaternary that generated subtle population expansions and contractions allowing the intermittent connection of habitats along the circum-Amazonian belt. Recognizing the dynamic history of climate-mediated forest expansions, contractions, and connections during the South American Pleistocene is central toward a mechanistic understanding of circum-Amazonian distributions.

中文翻译:

南美蚁er可变植物(Thamnophilus caerulescens)的植物志,沿着多个环境梯度分布。

新近热带显示出许多共同分布物种共有的丰富分布模式。一种独特的模式是所谓的“亚马逊环流分布”,这种现象在并非发生在亚马逊河中的物种中观察到,而是沿着横跨亚马逊河南部和东部,安第斯山麓和通常到委内瑞拉的森林栖息地带发生沿海山脉和Tepuis。尽管这种模式在动植物中普遍存在,但对其潜在的生物地理机制仍然知之甚少。可变蚂蚁(Thamnophilus caerulescens)是一种性二形亚卵亚种雀形目,显示出巨大的羽毛变化,并出现在环亚马逊河带的南部。我们描述了T的大规模系统学模式。使用来自线粒体和超保守元素(UCE)的DNA序列评估花青素并评估其人口统计历史。我们确定了三个基因组簇:a)北部大西洋森林;b)东南的塞拉多和中南部大西洋森林,以及c)查科和安第斯山脉。我们的结果与更新世的发散以及随后的基因流一致,主要是在后两个簇之间。没有人口快速增长或瓶颈的遗传特征。来自北大西洋森林的种群是该物种内遗传差异最大的群体。第四纪的湿润和干燥时期影响了淡色锥虫的人口历史,产生了微妙的种群膨胀和收缩,从而使环生-亚马逊河带的生境间歇性地连通。
更新日期:2020-04-06
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