Department of Biology and Biotechnology "C. Darwin", Sapienza University of Rome, 00161 Rome, Italy.
Department of Biology, University of Rome "Tor Vergata", 00133 Rome, Italy.
Genes (Basel). 2022 Jun 15;13(6):1071. doi: 10.3390/genes13061071.
Italy hosts a large number of endemic freshwater fish species due to complex geological events which promoted genetic differentiation and allopatric speciation. Among them, the South European roach inhabits various freshwater environments in three different ichthyogeographic districts. We investigated the genetic diversity of using two different mitochondrial markers (COI and CR), aiming to define its relationship with other similar taxa from the Balkan area and, from a phylogeographic perspective, test the effects of past hydrogeological dynamics of Italian river basins on its genetic structure and demographic history. Our analysis highlighted a marked genetic divergence between and all other roach species and, among Italian samples, revealed the existence of three deeply divergent geographic haplogroups, named A, B and C. Haplogroup C likely corresponds to a new putative cryptic species and is located at the northern border of the South European roach range; haplogroup B is restricted to Southern Italy; and haplogroup A is widespread across the entire range and in some sites it is in co-occurrence with C or B. Their origin is probably related to the tectonic uplifting of the Apuan Alps in the north and of the Colli Albani Volcano in the south during the Pleistocene, which promoted isolation and vicariance followed by secondary contacts.
意大利由于复杂的地质事件而拥有大量的淡水鱼类特有种，这些事件促进了遗传分化和异域物种形成。其中，南欧拟鲤栖息于三个不同的鱼类地理区的各种淡水环境中。我们使用两种不同的线粒体标记物（COI 和 CR）研究了 的遗传多样性，旨在确定它与来自巴尔干地区的其他类似分类群的关系，并从系统地理学的角度检验过去意大利流域的水文地质动态对其遗传结构和种群历史的影响。我们的分析表明，与其他拟鲤物种相比， 存在明显的遗传分化，在意大利样本中，存在三个深度分化的地理单倍型群，分别命名为 A、B 和 C。单倍型群 C 可能对应于一个新的潜在隐种，位于南欧拟鲤分布范围的北部边界；单倍型群 B 仅限于意大利南部；单倍型群 A 广泛分布于整个分布区，在一些地点与 C 或 B 共存。它们的起源可能与更新世期间阿尔卑斯山脉北部的阿普安阿尔卑斯山脉和南部的阿尔巴尼火山的构造隆起有关，这促进了隔离和地理隔离，随后发生了次生接触。
