Ambiguous species boundaries: Hybridization and morphological variation in two closely related Rubus species along altitudinal gradients.,Ecology and Evolution

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Ambiguous species boundaries: Hybridization and morphological variation in two closely related Rubus species along altitudinal gradients.
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-06-15 , DOI: 10.1002/ece3.6473
Makiko Mimura ₁ , Mihoko Suga _{2,

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Although hybridization frequently occurs among plant species, hybrid zones of divergent lineages formed at species boundaries are less common and may not be apparent in later generations of hybrids with more parental‐like phenotypes, as a consequence of backcrossing. To determine the effects of dispersal and selection on species boundaries, we compared clines in leaf traits and molecular hybrid index along two hybrid zones on Yakushima Island, Japan, in which a temperate (Rubus palmatus ) and subtropical (Rubus grayanus ) species of wild raspberry are found. Leaf sinus depth in the two hybrid zones had narrower clines at 600 m a.s.l. than the molecular hybrid index and common garden tests confirmed that some leaf traits, including leaf sinus depth that is a major trait used in species identification, are genetically divergent between these closely related species. The sharp transition in leaf phenotypic traits compared to molecular markers indicated divergent selection pressure on the hybrid zone structure. We suggest that species boundaries based on neutral molecular data may differ from those based on observed morphological traits.

中文翻译：

模糊的物种边界：两个密切相关的悬钩子物种沿海拔梯度的杂交和形态变化。

尽管杂交经常发生在植物物种之间，但在物种边界形成的不同谱系的杂交区域不太常见，并且由于回交的结果，在具有更多类似亲本表型的后代杂交中可能不明显。为了确定扩散和选择对物种边界的影响，我们比较了日本屋久岛两个杂交带的叶片性状和分子杂交指数，其中有温带（ Rubus palmatus ）和亚热带（ Rubus gryanus ）野生覆盆子物种被发现。两个杂交区的叶窦深度在 600 m asl 处的斜线比分子杂交指数更窄，并且普通花园测试证实，一些叶子性状（包括用于物种鉴定的主要性状的叶窦深度）在这些密切相关的基因之间存在遗传差异。相关物种。与分子标记相比，叶片表型性状的急剧转变表明杂种区结构上存在不同的选择压力。我们认为基于中性分子数据的物种边界可能与基于观察到的形态特征的物种边界不同。

更新日期：2020-07-30

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