Phylogeography of the Red-Headed Manakin Supports the River-Refuge Hypothesis

IF 3.4 2区 环境科学与生态学 Q2 ECOLOGY
Else Mikkelsen, Diogo Lavareda, Marcelo Vallinoto, Alexandre Aleixo, Jason Weir
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Abstract

Aim

The Amazon rainforest is one of the most biodiverse regions on earth, but our understanding of the processes that have shaped its patterns of diversity remains incomplete. One hypothesis for Amazonian speciation is the river-refuge hypothesis, which suggests that retraction of forests away from the periphery of Amazonia, where rivers are narrow, facilitated divergence of populations separated by wide rivers. Later re-expansion of forests would have allowed secondary contact between these populations, and co-occurring hybrid zones may reveal the location where expanding forests first reconnected. Here, we test whether a widespread Amazonian songbird species shows evidence of population contact zones in the eastern headwaters of the Tapajós river, hypothesised to be an area of secondary contact under the river-refuge hypothesis.

Location

Amazon and Atlantic forests of South America.

Taxon

Ceratopipra rubrocapilla (Pipridae, Passeriformes).

Methods

We sampled 147 C. rubrocapilla (Red-headed Manakin) across its vast range, with 70 samples sequenced using reduced-representation genomic sequencing and 139 sequenced at the mitochondrial gene cytochrome b. We use population genetic and phylogenetic analyses to investigate patterns of gene flow and population structure across the range, with a particular focus on samples from the headwaters of the Tapajós River to evaluate the potential role of the river-refuge hypothesis.

Results

We observe shallow population structure and evidence for widespread gene flow across the range of C. rubrocapilla. Patterns in the Tapajós headwaters match predictions of the river-refuge hypothesis, with eastern headwater samples most similar to samples farther west on the opposite bank of the Tapajós River.

Main Conclusions

The close co-occurrence between population contact zones within C. rubrocapilla and other previously studied hybrid zones reinforces the hypothesis that the eastern Tapajós headwaters is where rainforest populations reconnected in the past, following predictions of the river-refuge hypothesis of Amazonian speciation.

Abstract Image

红发侏儒猴的系统地理学支持河流避难假说
亚马逊雨林是地球上生物多样性最丰富的地区之一,但我们对形成其多样性模式的过程的理解仍然不完整。关于亚马逊物种形成的一个假说是河流避难假说,该假说认为森林从亚马逊河流域的边缘撤退,那里河流狭窄,促进了被宽阔河流分隔的种群分化。后来森林的再次扩张可能使这些种群之间有了二次接触,而共同发生的杂交带可能揭示了扩张的森林首次重新连接的位置。在这里,我们测试了一种广泛分布的亚马逊鸣禽物种是否在Tapajós河的东部源头显示出种群接触带的证据,该区域被假设为河流避难假说下的二次接触区域。地理位置:南美洲的亚马逊和大西洋森林。毛毛蠓分类群(蠓科,雀形目)。方法选取了147个红头马纳金(C. rubrocapilla,红头马纳金)样本,其中70个样本采用减少代表性基因组测序,139个样本采用线粒体基因细胞色素b测序。我们使用群体遗传和系统发育分析来研究整个范围内的基因流动模式和群体结构。特别关注Tapajós河源头的样本,以评估河流避难假说的潜在作用。结果观察到浅层的种群结构和广泛的基因流动。Tapajós源头的模式与河流避难假说的预测相吻合,东部的源头样本与Tapajós河对岸更西边的样本最相似。红毛瓢虫种群接触带与其他先前研究的杂交带之间的密切共存强化了东部Tapajós源头是过去雨林种群重新连接的假设,这是亚马逊物种形成的河流避难假设的预测。
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来源期刊
Journal of Biogeography
Journal of Biogeography 环境科学-生态学
CiteScore
7.70
自引率
5.10%
发文量
203
审稿时长
2.2 months
期刊介绍: Papers dealing with all aspects of spatial, ecological and historical biogeography are considered for publication in Journal of Biogeography. The mission of the journal is to contribute to the growth and societal relevance of the discipline of biogeography through its role in the dissemination of biogeographical research.
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