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Chaotic genetic patchiness in the pelagic teleost fish Sardina pilchardus across the Siculo-Tunisian Strait
Marine Biology Research ( IF 1.1 ) Pub Date : 2020-06-04 , DOI: 10.1080/17451000.2020.1752921
Temim Deli 1 , Souad Guizeni 1 , Lotfi Ben Abdallah 2 , Khaled Said 1 , Noureddine Chatti 1
Affiliation  

This investigation aims at assessing patterns of spatial genetic structure of the teleost fish Sardina pilchardus across the Siculo-Tunisian Strait (a well-known discontinuous biogeographic area) and delineating putative genetic stocks within the species. For this purpose, a total of 180 specimens, collected from 11 locations stretching across the western and eastern Mediterranean coasts of Tunisia, were analysed genetically by means of 18 nuclear allozyme loci. The outcome of this study revealed strong genetic differentiation among populations, with the marked genetic distinctiveness of the central Tunisian population at Mahdia. Despite the delineation of seven well-defined genetic groups, no significant correlation was found between genetic and geographic distances. Besides, the recorded population subdivision did not align with biogeographic boundaries, suggesting the presence of chaotic genetic patchiness. Recent genetic bottlenecks were evidenced in S. pilchardus populations. Patchy migration patterns were recorded among the examined pairs of sardine populations. Among the recorded 16 polymorphic loci, GPI-2 and SOD appeared to be subject to natural selection. Patterns of population genetic differentiation and structuring were not found to be driven by outlier loci that appeared to be under selection. Furthermore, the detected neutral GPI-1 locus was found to be responsible for most of the genetic variation among identified genetic clusters. Hence, natural selection cannot cause the detected genetic heterogeneity among sardine samples. Different explanations to the origin of chaotic genetic patterns, observed within S. pilchardus, were discussed.



中文翻译:

穿越锡库洛-突尼斯海峡的远洋硬骨鱼类沙丁鱼(Sardina pilchardus)的遗传杂乱

这项调查旨在评估硬骨鱼类沙丁鱼(Sardina pilchardus)的空间遗传结构模式跨过库库-突尼斯海峡(一个著名的不连续生物地理区域),并描述了该物种内的推定遗传种群。为此,通过18个核同工酶基因座对从突尼斯西部和东部地中海沿岸的11个地点收集的总共180个标本进行了遗传分析。这项研究的结果表明,种群之间存在强烈的遗传分化,而马赫迪耶的突尼斯中部种群具有明显的遗传特征。尽管划定了七个明确定义的遗传群体,但遗传距离和地理距离之间未发现显着相关性。此外,记录的人口细分与生物地理边界不符,表明存在混乱的遗传斑块。最近的遗传瓶颈在S. pilchardus种群。在沙丁鱼种群对之间记录了斑驳的迁移模式。在记录的16个多态位点中,GPI-2SOD似乎是自然选择的。没有发现种群遗传分化和结构化模式是由似乎处于选择中的异常基因座驱动的。此外,发现所检测到的中性GPI-1基因座是造成鉴定出的遗传簇之间大多数遗传变异的原因。因此,自然选择不能导致沙丁鱼样品之间检测到的遗传异质性。讨论了在沙眼沙门氏菌中观察到的关于混沌遗传模式起源的不同解释。

更新日期:2020-06-04
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