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首页> 外文期刊>American journal of botany >The evolution of substrate differentiation in Minuartia series Laricifoliae (Caryophyllaceae) in the European Alps: in situ origin or repeated colonization?
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The evolution of substrate differentiation in Minuartia series Laricifoliae (Caryophyllaceae) in the European Alps: in situ origin or repeated colonization?

机译：欧洲阿尔卑斯山的Minuartia系列Laricifoliae（石竹科）中底物分化的演变：原位起源还是重复定殖？

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Premise of the study: Substrate specialization is often considered an important factor in evolutionary diversification. A classic example of divergence related to different substrate types is the dichotomy between calcicole and calcifuge plants on calcareous and siliceous substrates as found in the European Alps. When closely related species with contrasting substrate preferences are found in the same area, it is generally hypothesized that they diverged where they now occur. However, it is possible that Alpine edaphic diversity instead allows the coexistence of related species whose edaphic differentiation took place deeper in the phylogeny, in some other part of the range of their clades. Methods: We used sequences of the nuclear internal and external transcribed spacer regions to examine the origin of substrate differentiation in Minuartia series Laricifoliae, which contains many edaphic endemics, including a pair of Alpine taxa with contrasting substrate preferences: Minuartia langii (calcicole) and M. laricifolia (calcifuge). Key results: Minuartia langii and M. laricifolia are each more closely related to Balkan species than they are to each other and reached the Alps independently. The clade to which they belong is ancestrally calcicole. Minuartia langii inherited the ancestral ecology, while M. laricifolia is part of a subclade with serpentine endemics and one substrate generalist. Conclusions: In the study group, taxa with contrasting substrate preferences did not diverge in the Alps. Instead, taxa whose substrate differentiation arose elsewhere, likely on the Balkan Peninsula, were preadapted to take advantage of Alpine substrate diversity.
机译：研究的前提：底物专业化通常被认为是进化多样化的重要因素。与不同底物类型有关的分歧的经典例子是在欧洲阿尔卑斯山发现的钙质和硅质底物上的细穗植物和碎屑植物之间的二分法。当在同一地区发现具有不同底物偏好的密切相关物种时，通常假设它们在现在发生的地方发散了。然而，有可能的是，阿尔卑斯山的edaphic多样性却允许其edaphic分化发生在更深的进化史上，在其进化枝范围的其他部分，相关物种并存。方法：我们使用核内和外转录间隔区的序列来检查Minuartia系列Laricifoliae系列中底物分化的起源，该系列包含许多特有的地方性物种，包括一对具有不同底物偏好的高山类群：Minuartia langii（calcicole）和M laricifolia（碎屑）。主要结果：Minuartia langii和M. laricifolia与巴尔干物种之间的关系比彼此更紧密，并分别到达阿尔卑斯山。他们所属的进化枝是钙。 Minuartia langii继承了祖先的生态学，而M. laricifolia是一个蛇形地方病和一个底物通才的小分支的一部分。结论：在研究组中，具有不同底物偏好的分类单元在阿尔卑斯山没有差异。取而代之的是，其底物分化发生在其他地方（可能在巴尔干半岛上）的分类单元被预先利用了高山底物的多样性。

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