The European river lamprey Lampetra fluviatilis and the European brook lamprey Lampetra planeri (Block 1784) are classified as a paired species, characterized by notably different life histories but morphological similarities. Previous work has further shown limited genetic differentiation between these two species at the mitochondrial DNA level. Here, we expand upon this previous work - which focused on lamprey species from the Iberian Peninsula in the south and mainland Europe in the north - by sequencing three mitochondrial marker regions of Lampetra individuals from five river systems in Ireland and five in southern Italy. Our results corroborate the previously identified pattern of genetic diversity for the species pair. We also show significant genetic differentiation between Irish and mainland European lamprey populations, suggesting another ichthyogeographic district distinct from those previously defined. Finally, our results stress the importance of southern Italian L. planeri populations, which maintain several private alleles and notable genetic diversity. This article is protected by copyright. All rights reserved.

中文翻译：

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基于线粒体数据的欧洲溪七鳃鳗 (Lampetra planri) 和欧洲河七鳃鳗 (Lampetra fluviatilis) 物种对的系统地理学

欧洲河七鳃鳗 Lampetra fluviatilis 和欧洲溪流七鳃鳗 Lampetra planeri (Block 1784) 被归类为配对物种，其特征是生活史明显不同，但形态相似。先前的工作进一步表明，这两个物种在线粒体 DNA 水平上的遗传差异有限。在这里，我们通过对来自爱尔兰五个河流系统和意大利南部五个河流系统的 Lampetra 个体的三个线粒体标记区域进行测序，扩展了之前的这项工作——重点是来自南部伊比利亚半岛和北部欧洲大陆的七鳃鳗物种。我们的结果证实了先前确定的物种对的遗传多样性模式。我们还展示了爱尔兰和欧洲大陆七鳃鳗种群之间的显着遗传差异，暗示另一个不同于先前定义的鱼类地理区域。最后，我们的结果强调了意大利南部 L. planri 种群的重要性，这些种群保持了几个私有等位基因和显着的遗传多样性。本文受版权保护。版权所有。