Living on the mountains: Patterns and causes of diversification in the springsnail subgenus Pseudamnicola (Corrosella) (Mollusca: Caenogastropoda: Hydrobiidae)
Living on the mountains: Patterns and causes of diversification in the springsnail subgenus Pseudamnicola (Corrosella) (Mollusca: Caenogastropoda: Hydrobiidae)
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DOI：
10.1016/j.ympev.2013.04.022
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发表时间：
2013-09-01
影响因子：
4.1
通讯作者：
Ramos, Marian A.
中科院分区：
文献类型：
--
作者：
Delicado, Diana;Machordom, Annie;Ramos, Marian A.
Hydrobiidae 是淡水腹足动物最大的科之一，由大约 400 属和 1000 种组成。尽管多样性程度很高，但大多数水生物种都栖息在有限分布区域的脆弱生态系统中。在这项工作中，我们分析了水生春蜗牛亚属 Pseudamnicola (Corrosella) 的物种形成模式和多样化原因。该群体的物种通常生活在营养贫乏的泉水和溪流中，仅限于伊比利亚半岛（西班牙）和法国南部的山区。先前的形态学和分子（仅基于细胞色素 C 氧化酶亚基 I (COI) 基因）研究揭示了 11 种名义 Corrosella 物种。在这项研究中，我们通过从 50 个 Corrosella 种群的线粒体（16S rRNA 和 COI）和核核糖体区域（18S 和 28S rRNA）生成新数据来增强已发表的分子结果。作为这项研究的结果，我们鉴定出了一个新物种，使得 Corrosella 亚属中总共有 12 个公认物种。我们的系统发育结果还揭示了该亚属内存在三个谱系，并且时间分歧的估计表明在中新世上部到更新世期间发生了三个主要物种形成事件。我们测试了几个地理和生态变量的影响，并观察到多样化模式与栖息地破碎化有关，而不是与环境条件有关。这一结果表明，在该亚属内观察到的高水平多样性可能是由非适应性辐射造成的。伊比利亚半岛山脉（北部的比利牛斯山脉和南部的贝蒂克科迪勒拉山脉）的形成和伊比利亚洋流水文系统的构造在科罗塞拉菌物种形成中发挥了重要作用。此外，在中新世期间，伊比利亚半岛经历了从北到南温度和干燥度的梯度上升，再加上高水平的构造活动，可能导致了伊比利亚半岛南部发现的大部分多样性。 (C) 2013 Elsevier Inc. 保留所有权利。
Hydrobiidae is one of the largest families of freshwater gastropods comprised of approximately 400 genera and 1000 species. Despite this high level of diversity, most hydrobiid species inhabit fragile ecosystems in restricted distribution areas. In this work, we analyze modes of speciation and causes of diversification in the hydrobiid springsnail subgenus Pseudamnicola (Corrosella). Species of this group typically live in nutrient poor springs and streams and are restricted to mountainous regions of the Iberian Peninsula (Spain) and Southern France. Previous morphological and molecular (based only on the cytochrome c oxidase subunit I (COI) gene) studies revealed 11 nominal Corrosella species. In this study, we enhance published molecular results by generating new data from mitochondrial (16S rRNA and COI) and nuclear ribosomal regions (18S and 28S rRNA) from 50 Corrosella populations. As a result of this study we have identified one new species, making a total of twelve recognized species in the subgenus Corrosella. Our phylogenetic results also reveal the existence of three lineages within the subgenus, and the estimation of time divergence indicates the occurrence of three main speciation events during the upper Miocene to Pleistocene. We test the influence of several geographical and ecological variables and observe that diversification patterns are related to habitat fragmentation rather than environmental conditions. This result suggests that the high level of diversity observed within the subgenus may have resulted from a non-adaptive radiation. The formation of the Iberian Peninsula mountain ranges (the Pyrenees in the north and the Betic Cordillera in the south) and the configuration of the Iberian current hydrographic system played important roles in Corrosella speciation. Additionally, during the Miocene the Iberian Peninsula experienced a gradient of increasing temperature and dryness from north to south, which together with a high level of tectonic activity, may have caused the majority of the diversity found in the southern Iberian Peninsula. (C) 2013 Elsevier Inc. All rights reserved.