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首页> 外文期刊>Molecular ecology >The anatomy of a 'suture zone' in Amazonian butterflies: A coalescent-based test for vicariant geographic divergence and speciation
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The anatomy of a 'suture zone' in Amazonian butterflies: A coalescent-based test for vicariant geographic divergence and speciation

机译：亚马逊蝴蝶“缝线区”的解剖：基于联盟的测试，对维多利亚时代的地理差异和物种形成

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Attempts by biogeographers to understand biotic diversification in the Amazon have often employed contemporary species distribution patterns to support particular theories, such as Pleistocene rainforest refugia, rather than to test among alternative hypotheses. Suture zones, narrow regions where multiple contact zones and hybrid zones between taxa cluster, have been seen as evidence for past expansion of whole biotas that have undergone allopatric divergence in vicariant refuges. We used coalescent analysis of mutilocus sequence data to examine population split times in 22 pairs of geminate taxa in ithomiine and heliconiine butterflies. We test a hypothesis of simultaneous divergence across a suture zone in NE Peru. Our results reveal a scattered time course of diversification in this suture zone, rather than a tight cluster of split times. Additionally, we find rapid diversification within some lineages such as Melinaea contrasting with older divergence within lineages such as the Oleriina (Hyposcada and Oleria). These results strongly reject simple vicariance as a cause of the suture zone. At the same time, observed lineage effects are incompatible with a series of geographically coincident vicariant events which should affect all lineages similarly. Our results suggest that Pleistocene climatic forcing cannot readily explain this Peruvian suture zone. Lineage-specific biological traits, such as characteristic distances of gene flow or varying rates of parapatric divergence, may be of greater importance.
机译：生物地理学家试图了解亚马逊地区的生物多样性的尝试经常采用当代物种分布模式来支持特定理论，例如更新世雨林避难所，而不是在其他假设之间进行检验。缝线区，狭窄的区域（在多个单元区之间有多个接触区和混合区）被看作是整个生物群过去扩张的证据，而整个生物群已经在异域避难所中经历了异相扩散。我们使用了对mutilocus序列数据的合并分析，以检查了在依托米因和螺旋藻蝴蝶中22对成对的类群中的种群分裂时间。我们检验了在秘鲁东北部跨缝合区同时发散的假设。我们的结果显示，在该缝合区内分散的时间过程分散，而不是紧密的分散时间簇。另外，我们发现某些物种（如Melinaea）中的物种迅速分化，而与像Oleriina（Hyposcada和Oleria）这样的家族中较早的分化形成鲜明对比。这些结果强烈拒绝简单的差异作为缝合区域的原因。同时，观察到的宗族效应与一系列地理上同时发生的维多利亚时代事件不相容，这些事件应同样影响所有宗族。我们的结果表明，更新世的气候强迫不能轻易解释这个秘鲁缝合带。特定于世袭的生物学特征，例如基因流的特征距离或不同的祖传异质速率，可能更为重要。

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