Population structure, genetic diversity, and geophylogeny of five populations of the Scarface rockskipper, Istiblennius pox Springer & Williams, 1994 were explored from two ecoregions using the D-loop marker of the mitochondrial control region. The results revealed no significant population genetic structure and no provable recent demographic expansion in the studied samples. The phylogeographic pattern retrieved in this study was a deep genealogical separation with major lineages broadly sympatric. The possible reasons for this phylogeographic pattern could be explained by the following: (i) high gene flow in a species with large evolutionary effective population size, in which some anciently separated lineages might by chance have been retained, whereas many intermediate genotypes were lost over time by gradual lineage sorting; and (ii) secondary contact and admixture between allopatrically evolved populations/lineages as a result of the Late Pleistocene glaciations, followed by recent and ongoing colonization events and high level of gene flow along the coasts of the Persian Gulf and Oman Sea, caused by larval dispersal. These findings were incongruent with previous morphological studies on this species from the same area, suggesting that phenotypic variability among the Scarface rockskipper populations may arise without major genetic differentiation.

中文翻译：

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波斯湾和阿曼海的Scarface矶kIstiblennius pox（Teleostei：Blenniidae）的遗传多样性，种群结构和地理系统发生

斯卡菲斯石斑鱼（Istiblennius pox）的五个种群的种群结构，遗传多样性和地理发生Springer＆Williams，1994年使用线粒体控制区的D环标记从两个生态区进行了研究。结果表明，在研究的样本中没有明显的种群遗传结构，也没有可证明的近期人口膨胀。在这项研究中检索到的谱系模式是与主要谱系广泛同伴的深谱系分离。可能通过以下方式解释这种系统地理模式的原因：（i）具有较大进化有效种群规模的物种中的高基因流，其中一些古老分离的谱系可能会被保留，而许多中间基因型在通过逐步沿袭分类的时间；（ii）由于晚更新世冰川作用，异相演化的种群/血统之间的第二次接触和混合，随后是近期和持续的定居事件，以及幼虫引起的波斯湾和阿曼海沿岸的高水平基因流动分散。这些发现与之前在同一地区对该物种的形态学研究不一致，这表明在没有重大遗传分化的情况下，Scarface岩礁种群的表型变异可能会出现。